CN114389133A - Chirp pulse amplification method, laser processing apparatus, and storage medium - Google Patents
Chirp pulse amplification method, laser processing apparatus, and storage medium Download PDFInfo
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Abstract
The application provides a chirped pulse amplification method, a laser, laser processing equipment and a storage medium, and relates to the technical field of lasers. The method is applied to a chirped pulse amplification laser, and the laser comprises the following components: a controller, a reflective component and a grating, wherein the grating is the only grating in the laser, the method comprising: the reflection component determines the input angle of the pulse broadening signal passing through the grating; the reflection assembly amplifies the broadened pulse signals according to the input angle to obtain amplified pulse signals; the grating determines the dispersion compensation information of the amplified pulse signal according to the input angle; the grating compresses the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal. The method and the device have the advantages that the single grating is used for broadening, amplifying and compressing the pulse width of the pulse signal, the broadening, amplifying and compressing effects are optimized, the internal structure is simplified to save the device cost, the dispersion can be controlled, and the performance of the chirped pulse amplification laser is effectively improved.
Description
Technical Field
The present disclosure relates to the field of laser technology, and in particular, to a chirped pulse amplification method, a laser processing device, and a storage medium.
Background
High pulse energy fiber laser systems have important application requirements in the industrial and scientific fields. However, as the peak power of the pulse increases, the nonlinear threshold of the fiber in the amplifier severely limits the laser output at high pulse energies.
At present, in order to suppress the nonlinear effect in the Amplification process, a Chirped Pulse Amplification (CPA) technology is generally adopted, which can obtain sufficient energy extraction and ensure the compressibility of the Pulse. However, in the existing Chirped pulse amplification mode, a plurality of Chirped Volume Bragg Gratings (CVBG) are required, so that the existing Chirped pulse amplification laser has high cost, a complex structure and a large Volume, and has poor performance of expanding or compressing pulses, and cannot meet the requirements of users.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a chirped pulse amplification method, a laser processing apparatus, and a storage medium, so as to solve the problem in the prior art that a chirped pulse amplification laser has poor performance.
In order to solve the above problem, in a first aspect, the present application provides a chirped pulse amplification method applied to a chirped pulse amplification laser, the laser including: a controller, a reflective component, and a grating, wherein the grating is the only grating in the laser, the method comprising:
the controller determines an input angle of a stretched pulse signal passing through the grating based on the reflection component;
the reflection assembly amplifies the pulse broadening signal according to the input angle to obtain an amplified pulse signal;
the controller determines the dispersion compensation information of the amplified pulse signal according to the input angle;
and the grating compresses the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal.
In the implementation manner, the reflection device obtains the broadened pulse signal obtained by broadening the pulse signal in the grating, so that the controller can determine an input angle of the broadened pulse signal when the broadened pulse signal enters the reflection device, and the reflection component amplifies the broadened pulse signal according to the input angle to obtain a corresponding amplified pulse signal. The controller determines the dispersion compensation information of the amplified pulse signal passing through the grating according to the input angle, so that the grating can compress the amplified pulse signal according to the determined dispersion compensation information to obtain a corresponding output pulse signal. The operation of simultaneously widening, amplifying and compressing the pulse signal can be realized through a single grating, the internal structure of the chirped pulse amplification laser is simplified, the device cost in the laser is saved, and the widening, amplifying and compressing effects are optimized. The dispersion is controlled and adjusted by controlling the input angle of the pulse signal, thereby realizing the control of the pulse width of the output pulse signal. The overlapping of pulse energy in the grating can be reduced, the damage condition of the grating caused by overhigh pulse energy is reduced, the use frequency of the grating is improved so as to improve the use rate of the grating, and the performance of the chirped pulse amplification laser is effectively improved.
Optionally, the controller determines an input angle of the stretched pulse signal passing through the grating based on the reflection component, including:
the controller determines a reflective structure inside the reflective assembly;
the controller determines the input angle at which the stretched pulse signal passing through the grating is input, based on the reflection structure.
In the above implementation, the input angle of the stretched pulse signal can be determined by the controller determining the reflection structure inside the reflection assembly. Through the internal structure of adjusting the reflection device, the input angle of each broadening pulse signal is controlled, different reflection can be carried out on different pulse signals according to requirements or actual conditions, and the adjustability in the input of the pulse signals is improved.
Optionally, the determining, by the controller, dispersion compensation information of the amplified pulse signal according to the input angle includes:
the controller determines the incidence times of the amplified pulse signal through the grating according to the input angle and the reflection structure;
the controller determines dispersion compensation information of the amplified pulse signal based on the number of incidence times.
In the implementation manner, the controller can determine the incidence times of the amplified pulse signal when the amplified pulse signal is input to the grating through the determined input angle when the amplified pulse signal is input and the reflection structure inside the reflection assembly, so as to perform gradient multiple adjustment on the dispersion of the amplified pulse signal according to the incidence times. The incidence times can be controlled by controlling the input angle, thereby controlling and adjusting the dispersion. The overlapping condition of pulse energy in the grating can be effectively reduced, the damage condition of overhigh pulse energy to a grating device is reduced, the times of pulse signals passing through the grating are increased, and the safety and the utilization rate of the grating are improved.
Optionally, the amplifying the pulse broadening signal according to the input angle by the reflection component to obtain an amplified pulse signal, including:
the reflection assembly acquires the incidence times determined by the controller according to the input angle;
and the reflection assembly reflects the broadened pulse signals for multiple times according to the incidence times to obtain the amplified pulse signals.
In the above implementation manner, the reflection component reflects the broadened pulse signal for multiple times on the basis of the obtained incidence times, and can amplify the broadened pulse signal through multiple reflections, and during amplification, the reflection component can amplify in multiple different amplification manners. Since the pulse signal after being stretched is amplified, more pulse energy can be extracted during amplification, and damage to the gain medium of the pulse signal can be reduced.
Optionally, before the controller determines an input angle of the stretched pulse signal passing through the grating based on the reflection component, the method further comprises:
a signal source inputs an initial pulse signal into the grating;
and the grating stretches the initial pulse signal according to the initial dispersion information to obtain the stretched pulse signal.
In the implementation manner, before determining the input angle, an initial pulse signal of the laser output from the signal source may be broadened through a single grating, and the grating adjusts a pulse width of the initial pulse signal passing through the grating according to the introduced initial dispersion information, so as to obtain a corresponding broadened pulse signal. The single grating can be adopted in the chirped pulse amplification laser to simultaneously widen and compress the pulse signal, so that the processing efficiency of the grating on the pulse signal is improved.
Optionally, the initial dispersion information is normal dispersion;
the dispersion compensation information is anomalous dispersion.
In the implementation manner, the dispersion introduced by the grating during broadening is normal dispersion, the dispersion compensation information introduced by the grating during compression is anomalous dispersion, the dispersion notability and the optical path difference between the normal dispersion and the anomalous dispersion are opposite, the relationship between the refractive index and the wavelength of the anomalous dispersion is different from the rule in the normal dispersion, and broadening and compression can be respectively performed through the opposite dispersion.
Optionally, the compressing, by the grating, the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal, including:
the reflection component reflects the amplified pulse signal into the grating;
the controller determines a corresponding compressed pulse width according to the dispersion compensation information and the amplified pulse signal;
and the grating compresses the amplified pulse signal according to the compressed pulse width to obtain the output pulse signal.
In the implementation manner, the grating compensates the introduced amplified pulse signal according to the determined dispersion compensation information, and the controller can determine the corresponding compressed pulse width according to the compensated dispersion information, so that the grating compresses the amplified pulse signal according to the compressed pulse width to obtain the output pulse signal for output. The dispersion during output can be controlled according to different input angles, so that the pulse width of the output pulse signal is adjusted, and the control and adjustment of the pulse width of the pulse signal are realized.
In a second aspect, the present application also provides a chirped pulse amplification laser, the laser comprising: the laser comprises a controller, a reflecting component and a grating, wherein the grating is the only grating in the laser;
the controller to determine an input angle of a stretched pulse signal passing through the grating based on the reflection component;
the reflection assembly is used for amplifying the pulse broadening signal according to the input angle to obtain an amplified pulse signal;
the controller is further configured to determine dispersion compensation information of the amplified pulse signal according to the input angle;
and the grating is used for compressing the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal.
In the implementation mode, the pulse signals can be simultaneously widened, amplified and compressed by combining the single grating with the controller and the reflection assembly, the internal structure of the amplification laser is simplified, the device cost in the chirped pulse amplification laser is saved, and the effects of widening, amplifying and compressing the pulse signals are optimized. The dispersion is controlled and adjusted by controlling the input angle of the pulse signal, thereby realizing the control of the pulse width of the output pulse signal. The overlapping of pulse energy in the grating is reduced, so that the damage condition of the grating caused by overhigh pulse energy is reduced, the use frequency of the grating is improved to improve the use rate of the grating, and the performance of the chirped pulse amplification laser is effectively improved.
In a third aspect, the present application further provides a laser processing apparatus, where the laser processing apparatus includes a memory and a processor, where the memory stores program instructions, and the processor executes the steps in any implementation manner of the above chirped pulse amplification method when reading and executing the program instructions.
In a fourth aspect, the present application further provides a computer-readable storage medium, where computer program instructions are stored, and when the computer program instructions are read and executed by a processor, the steps in any implementation manner of the above chirp pulse amplification method are executed.
In summary, the present application provides a chirped pulse amplification method, a laser processing device, and a storage medium, which can simultaneously perform stretching, amplification, and compression operations on a pulse signal using a single grating, thereby simplifying the internal structure of the amplified laser, saving the device cost of the laser, and optimizing the stretching, amplification, and compression effects. And the pulse width of the output pulse signal is controlled by controlling the input angle of the pulse signal, so that the damage condition of the grating is reduced, the utilization rate of the grating is improved, and the performance of the chirped pulse amplification laser is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a chirped pulse amplification method according to an embodiment of the present application;
fig. 2 is a detailed flowchart of step S1 according to an embodiment of the present disclosure;
fig. 3 is a detailed flowchart of step S3 according to an embodiment of the present disclosure;
fig. 4 is a detailed flowchart of step S2 according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of another chirped pulse amplification method according to an embodiment of the present application;
fig. 6 is a detailed flowchart of step S4 according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a chirped pulse amplification laser according to an embodiment of the present application.
Icon: 500-chirped pulse amplification laser; 510-a controller; 520-a reflective component; 530-grating; 540-the signal source.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without any creative effort belong to the protection scope of the embodiments of the present application.
In the Chirped pulse amplification technology adopted at present, at least two CVBGs (Chirped Volume Bragg gratings) are required to be used for operation in a Chirped pulse amplification laser, and in order to improve the compression effect of the laser, the two CVBGs are different in type under most conditions. In addition, in the existing laser, the pulse signal is amplified in a single CVBG (continuous variable bandwidth group) mode, so that the utilization rate of the CVBG is low, the dispersion compensation amount of two CVBGs is usually a fixed value, the laser cannot manage the dispersion of the two CVBGs, the performance of pulse broadening or compressing is poor, and the requirement of a user cannot be met.
Therefore, in order to solve the above problems, the present application provides a chirped pulse amplification method, a laser processing apparatus, and a storage medium. Referring to fig. 1, fig. 1 is a schematic flow chart of a chirped pulse amplification method according to an embodiment of the present application, where the method includes the following steps:
in step S1, the controller determines an input angle of the stretched pulse signal passing through the grating based on the reflection component.
After the controller obtains the broadened pulse signals obtained by broadening in the grating by the reflection assembly, the input angle of the broadened pulse signals when the broadened pulse signals are input into the reflection assembly can be determined according to the specific structure of the reflection assembly.
Alternatively, the reflection assembly may be an assembly composed of a plurality of mirrors, and may receive and reflect the pulse signal of the laser light at different angles. The grating can be a grating such as CVBG applied to the chirp amplification technology, and can expand and compress the pulse signal to adjust the pulse width of the pulse signal. The controller may be a variety of devices that are coupled to the grating and reflective assembly and that are capable of acquiring data from and controlling the grating and reflective assembly.
And step S2, the reflection assembly amplifies the pulse broadening signal according to the input angle to obtain an amplified pulse signal.
The reflection assembly is used as the amplification module to reflect the broadened pulse signals, so that the broadened pulse signals are amplified, more pulse energy can be extracted during amplification, and the damage condition of the extracted pulse energy to a gain medium is reduced.
Alternatively, the amplification may be performed by using various amplification methods, for example, a laser amplification crystal, a focusing mirror, and other various devices are added to the reflection assembly to amplify the pulse signal of the laser.
In step S3, the controller determines dispersion compensation information of the amplified pulse signal according to the input angle.
The controller can determine dispersion compensation information for compensating when the pulse signal passes through the grating according to the input angle so as to compensate the amplified pulse signal.
It should be noted that, due to the difference of the input angles, the dispersion compensation information during compensation is different, and thus the adjustment degree of the pulse width is different. The dispersion can be controlled and adjusted by controlling the input angle of the pulse signal, thereby realizing the control of the pulse width of the output pulse signal.
And step S4, the grating compresses the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal.
The grating can correspondingly compensate the chromatic dispersion of the amplified pulse signal according to the chromatic dispersion compensation information, so that the pulse width of the amplified pulse signal can be compressed according to the compensated chromatic dispersion, an output pulse signal for output is obtained, and the pulse peak power of the output pulse signal is improved.
It is worth to be noted that the chirped pulse amplification laser applied in the chirped pulse amplification method in the embodiment of the present application includes only one unique grating, so that an internal structure of the chirped pulse amplification laser can be simplified, a plurality of gratings do not need to be used, and device cost of the gratings is effectively reduced. The operation of simultaneously widening, amplifying and compressing the pulse signals is realized through a single grating, the effects of widening, amplifying and compressing the pulse signals are optimized, and the utilization rate of the grating can be effectively improved.
Alternatively, the chirped pulse amplification laser may be an ultrafast laser based on mode locking technology such as SESAM (semiconductor saturable absorber mirror), kerr lens, etc., and having a pulse width in the order of picoseconds or even femtoseconds.
Optionally, the Pulse Amplification technology adopted in the present application may be a Chirped Pulse Amplification (CPA) technology, which can prevent the laser Pulse energy from exceeding the damage threshold of the element to damage the element, and simultaneously, can effectively extract energy from the gain medium, and can utilize chirping of frequency, widen the Pulse width of the Pulse signal by using a single grating and a reflection component, amplify the Pulse width, and then compress the Pulse width to the original width, so as to simultaneously widen, amplify, and compress the Pulse signal, and obtain the short Pulse and high-power femtosecond Pulse. Effectively improves the peak power of the laser pulse and achieves the purpose of compressing the pulse width.
In the embodiment shown in fig. 1, a single grating is used for stretching and compressing, which effectively improves the efficiency of pulse amplification and improves the performance of the chirped pulse amplification laser.
Optionally, referring to fig. 2, fig. 2 is a detailed flowchart of step S1 provided in the present embodiment, and step S1 may further include steps S11 to S12.
In step S11, the controller determines a reflective structure inside the reflective assembly.
The reflecting structure in the reflecting assembly can be adjusted by selecting and adjusting the number of the reflecting mirrors and the positions, angles and the like of the reflecting mirrors, and the controller can determine the reflecting structure in the reflecting assembly through connection.
Alternatively, the reflective structure may be determined by different reflection modes, such as reflection by multi-pass chirp, reflection by disc chirp or reflection by slab chirp, etc.
Step S12, the controller determines the input angle at which the stretched pulse signal passing through the grating is input, according to the reflection structure.
The input angles of the pulse broadening signals input into each reflection assembly are different due to different reflection structures, and the controller can determine the corresponding input angle of the pulse broadening signals input under the structure through the determined reflection structure, so that the input angle is controlled and adjusted.
In the embodiment shown in fig. 2, the internal structure of the reflection device is adjusted to control the input angle of each broadened pulse signal, so that different pulse signals can be reflected differently according to requirements or actual conditions, and the adjustability of the pulse signals during input is improved.
Optionally, referring to fig. 3, fig. 3 is a detailed flowchart of step S3 provided in the present embodiment, and step S3 may further include steps S31 to S32.
And step S31, the controller determines the incidence times of the amplified pulse signal through the grating according to the input angle and the reflection structure.
The controller can determine the incidence times of the amplified pulse signals when the pulse signals pass through the grating according to the input angle and the reflection structure, so that the pulse signals can pass through the grating in different incidence modes.
In step S32, the controller determines dispersion compensation information of the amplified pulse signal based on the number of times of incidence.
The controller may calculate corresponding dispersion compensation information according to the number of times of incidence, and the calculation method may include: when the amplified pulse signal passes through the grating for multiple times, determining the single dispersion compensation k of the pulse signal entering the grating for a single time, and when the pulse signal enters the grating for multiple times by the incidence times n, generating dispersion compensation information of
. Therefore, the dispersion compensation information can generate gradient multiple change based on the change of the incidence times, and the incidence times can be controlled by controlling the input angle, so that the dispersion can be controlled and adjusted in a gradient manner.
It is worth to be noted that, because the amplified pulse signal can pass through the grating for many times, the pulse peak power of the amplified pulse signal is high, and the overlapping condition of the laser beam in the reflection process can be reduced when the reflection structure is designed, thereby reducing the local pulse energy density and the peak power density in the grating, reducing the overlapping of the pulse energy inside the grating, reducing the damage condition of the grating caused by the overhigh pulse energy, improving the use times of the grating, and improving the utilization rate and the safety of the grating.
In the embodiment shown in fig. 3, the incidence times of the pulse signal passing through the grating can be controlled according to the input angle of the pulse signal, so as to control the dispersion in the laser and realize the adjustment of the pulse width.
Optionally, referring to fig. 4, fig. 4 is a detailed flowchart of step S2 provided in the present embodiment, and step S2 may further include steps S21 to S22.
And step S21, the reflection assembly acquires the incidence times determined by the controller according to the input angle.
The reflection assembly can acquire the incidence times corresponding to the current input angle calculated in the controller due to the difference of the incidence times caused by the difference of the input angles.
Alternatively, the number of times of incidence may be acquired in the same manner as in fig. 3.
And step S22, the reflection assembly reflects the pulse broadening signal for multiple times according to the incidence times to obtain the amplified pulse signal.
The reflection mirror and other components in the reflection component can reflect the broadened pulse signals for multiple times corresponding to the incidence times, so that the pulse peak power of the broadened pulse signals is improved according to the multiple reflections, amplified pulse signals with high pulse peak average power are obtained, and the peak power of output laser pulses is improved.
Alternatively, it is also possible to provide components such as a laser amplifying crystal and a focusing mirror in the reflection assembly, and adjust the number and positions of the components such as the laser amplifying crystal and the focusing mirror to correspondingly amplify the pulse peak power of the broadened pulse signal.
Optionally, when the pulse signal is broadened, the pulse width of the pulse signal is longer and the peak power of the pulse signal is lower, so that more pulse energy can be extracted during amplification, and damage to a gain medium of the pulse signal can be reduced.
In the embodiment shown in fig. 4, the pulse signal is correspondingly amplified according to the number of times of incidence, and the peak power of the pulse signal can be effectively increased.
Optionally, referring to fig. 5, fig. 5 is a schematic flow chart of another chirped pulse amplification method according to an embodiment of the present application, and before step S1, the method may further include step Sa-Sb.
And step Sa, inputting an initial pulse signal into the grating by the signal source.
Before obtaining the input angle, the signal source may input the initial pulse signal of the laser into the grating, and the initial pulse signal of the laser output from the signal source is broadened by the single grating.
Alternatively, the seed source may be an ultrafast seed source capable of providing an ultrafast seed signal laser outputting picosecond/femtosecond pulse laser as an output pulse signal.
Optionally, the collimator may be further used to receive the initial pulse signal sent from the signal source and send the initial pulse signal to the grating, so as to ensure that the laser can be output to the grating in a collimated manner, and improve the accuracy of receiving the initial pulse signal.
Optionally, the controller may be connected to the signal source to control the laser output in the signal source.
And Sb, broadening the initial pulse signal by the grating according to the initial dispersion information to obtain the broadened pulse signal.
The grating can introduce initial dispersion information once or for many times, broaden the pulse width of an initial pulse signal before the initial pulse enters a gain medium, broaden the pulse time, reduce the pulse peak power and increase the optical path difference of the pulses with different wavelengths. The dispersion value of the initial dispersion information determines the degree of pulse widening, and as the initial dispersion information increases, the degree of widening of the pulse signal increases, and the peak power decreases more.
It should be noted that the initial dispersion information introduced by the grating during broadening is normal dispersion, and the dispersion compensation information introduced by the grating during compressing is anomalous dispersion. The dispersion memorability and the optical path difference of the normal dispersion and the anomalous dispersion are opposite, the relation between the refractive index and the wavelength of the anomalous dispersion is different from the rule in the normal dispersion, and the normal dispersion and the anomalous dispersion can be respectively widened and compressed through the opposite dispersion.
In the embodiment shown in fig. 5, a single grating can be used in the chirped pulse amplification laser to simultaneously perform stretching and compression processing on the pulse signal, so that the processing efficiency of the grating on the pulse signal is improved.
Optionally, referring to fig. 6, fig. 6 is a detailed flowchart of step S4 provided in the present embodiment, and step S4 may further include steps S41 to S43.
In step S41, the reflection assembly reflects the amplified pulse signal into the grating.
The reflection assembly reflects the amplified pulse signal into the grating again through a reflection device such as a mirror therein, so that the beam of the pulse signal is dispersed through the grating.
And step S42, the controller determines a corresponding compressed pulse width according to the dispersion compensation information and the amplified pulse signal.
The grating can compensate the amplified pulse signal according to the introduced dispersion compensation information, so that the controller determines the compression pulse width during compression according to the compensated dispersion information.
Alternatively, the compressed pulse width may be an initial pulse width when the initial pulse signal is not stretched.
And step S43, the grating compresses the amplified pulse signal according to the compressed pulse width to obtain the output pulse signal.
The grating can disperse the amplified pulse signal, the pulse width of the amplified pulse signal is compressed according to the determined compressed pulse width in the dispersion process, the output pulse signal with higher pulse peak power after pulse width compression can be obtained, the damage condition of a gain medium and the adverse nonlinear effects such as gain saturation are reduced, the high-efficiency absorption of the stored energy of the gain medium is facilitated, and the peak power of the pulse laser is effectively improved.
Optionally, the adjustment of the dispersion compensation information may be combined with the existing self-phase modulation basis to obtain an output pulse signal with a narrower pulse width, so that various pulse signals meeting various requirements can be output according to needs.
In the embodiment shown in fig. 6, the dispersion at the time of output can be controlled, so that the pulse width of the output pulse signal can be adjusted, and the control and adjustment of the pulse width of the pulse signal can be realized.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a chirped pulse amplification laser according to an embodiment of the present application, and the chirped pulse amplification laser 500 may include: a controller 510, a reflective component 520, and a grating 530, wherein the grating 530 is the only grating in the chirped pulse amplification laser 500.
A controller 510 for determining an input angle of a stretched pulse signal passing through the grating 530 based on the reflection component 520;
the reflection component 520 is configured to amplify the pulse broadening signal according to the input angle to obtain an amplified pulse signal;
the controller 510 is further configured to determine dispersion compensation information of the amplified pulse signal according to the input angle;
the grating 530 is configured to compress the amplified pulse signal according to the dispersion compensation information, so as to obtain an output pulse signal.
In an alternative embodiment, the controller 510 is further configured to determine a reflective structure inside the reflective assembly 520; from the reflection structure, the input angle at which the stretched pulse signal passed through the grating 530 is input is determined.
In an alternative embodiment, the controller 510 is further configured to determine the number of times the broadened pulse signal is incident through the grating 530 according to the input angle and the reflection structure; determining dispersion compensation information of the amplified pulse signal based on the number of incidences.
In an alternative embodiment, the reflection component 520 is further configured to obtain the number of times of incidence determined by the controller 510 according to the input angle; and reflecting the broadened pulse signals for multiple times according to the incidence times to obtain the amplified pulse signals.
In an alternative embodiment, the chirped pulse amplification laser 500 may further comprise a signal source 540 for inputting an initial pulse signal into the grating 530 before the controller 510 determines an input angle of the stretched pulse signal passing through the grating 530 based on the reflection component 520;
the grating 530 is further configured to stretch the initial pulse signal according to the initial dispersion information to obtain the stretched pulse signal.
In an optional embodiment, the initial dispersion information is normal dispersion; the dispersion compensation information is anomalous dispersion.
In an alternative embodiment, the reflection component 520 is further configured to reflect the amplified pulse signal into the grating 530;
a controller 510, further configured to determine a corresponding compressed pulse width according to the dispersion compensation information and the amplified pulse signal;
and the grating 530 is further configured to compress the amplified pulse signal according to the compressed pulse width to obtain the output pulse signal.
Since the principle of the chirped pulse amplification laser 500 in the embodiment of the present application to solve the problem is similar to that in the foregoing embodiments of the chirped pulse amplification method, the implementation of the chirped pulse amplification laser 500 in the embodiment of the present application may refer to the description in the foregoing embodiments of the chirped pulse amplification method, and repeated details are not repeated.
The embodiment of the present application further provides a laser processing apparatus, which includes a memory and a processor, where the memory stores program instructions, and when the processor reads and runs the program instructions, the processor executes the steps in any one of the chirp pulse amplification methods provided in this embodiment.
The present invention further provides a computer-readable storage medium, where computer program instructions are stored, and when the computer program instructions are read and executed by a processor, the steps in any one of the chirp pulse amplification methods provided in this embodiment are executed.
To sum up, the embodiments of the present application provide a chirped pulse amplification method, a laser processing device, and a storage medium, which can use a single grating to simultaneously perform operations of stretching, amplifying, and compressing on a pulse signal, simplify an internal structure of an amplification laser, save device cost in the laser, and optimize effects of stretching, amplifying, and compressing. And the pulse width of the output pulse signal is controlled by controlling the input angle of the pulse signal, so that the damage condition of the grating is reduced, the utilization rate of the grating is improved, and the performance of the chirped pulse amplification laser is effectively improved.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other ways. The above-described system embodiments are merely illustrative, for example, the block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of devices according to various embodiments of the present application. In this regard, each block in the block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams, and combinations of blocks in the block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Therefore, the present embodiment further provides a readable storage medium, in which computer program instructions are stored, and when the computer program instructions are read and executed by a processor, the computer program instructions perform the steps of any of the block data storage methods. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a RanDom Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A chirped pulse amplification method, wherein the method is applied to a chirped pulse amplification laser, and the laser comprises: the laser comprises a controller, a reflecting component and a grating, wherein the grating is the only grating in the laser; the method comprises the following steps:
the controller determines an input angle of a stretched pulse signal passing through the grating based on the reflection component;
the reflection assembly amplifies the pulse broadening signal according to the input angle to obtain an amplified pulse signal;
the controller determines the dispersion compensation information of the amplified pulse signal according to the input angle;
and the grating compresses the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal.
2. The method of claim 1, wherein the controller determines an input angle of the stretched pulse signal through the grating based on the reflection component, comprising:
the controller determines a reflective structure inside the reflective assembly;
the controller determines the input angle at which the stretched pulse signal passing through the grating is input, based on the reflection structure.
3. The method of claim 2, wherein the controller determines dispersion compensation information for the amplified pulse signal based on the input angle, comprising:
the controller determines the incidence times of the amplified pulse signal through the grating according to the input angle and the reflection structure;
the controller determines dispersion compensation information of the amplified pulse signal based on the number of incidence times.
4. The method of claim 1, wherein the reflection assembly amplifies the stretched pulse signal according to the input angle to obtain an amplified pulse signal, comprising:
the reflection assembly acquires the incidence times determined by the controller according to the input angle;
and the reflection assembly reflects the broadened pulse signals for multiple times according to the incidence times to obtain the amplified pulse signals.
5. The method of claim 1, wherein before the controller determines the input angle of the stretched pulse signal through the grating based on the reflection component, the method further comprises:
a signal source inputs an initial pulse signal into the grating;
and the grating stretches the initial pulse signal according to the initial dispersion information to obtain the stretched pulse signal.
6. The method of claim 5, wherein the initial dispersion information is normal dispersion;
the dispersion compensation information is anomalous dispersion.
7. The method of claim 1, wherein the grating compresses the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal, comprising:
the reflection component reflects the amplified pulse signal into the grating;
the controller determines a corresponding compressed pulse width according to the dispersion compensation information and the amplified pulse signal;
and the grating compresses the amplified pulse signal according to the compressed pulse width to obtain the output pulse signal.
8. A chirped pulse amplification laser, characterized in that the laser comprises: the laser comprises a controller, a reflecting component and a grating, wherein the grating is the only grating in the laser;
the controller to determine an input angle of a stretched pulse signal passing through the grating based on the reflection component;
the reflection assembly is used for amplifying the pulse broadening signal according to the input angle to obtain an amplified pulse signal;
the controller is further configured to determine dispersion compensation information of the amplified pulse signal according to the input angle;
and the grating is used for compressing the amplified pulse signal according to the dispersion compensation information to obtain an output pulse signal.
9. A laser machining apparatus comprising a memory having stored therein program instructions and a processor that, when executed, performs the steps of the method of any one of claims 1 to 7.
10. A computer-readable storage medium having computer program instructions stored thereon for execution by a processor to perform the steps of the method of any one of claims 1-7.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081543A (en) * | 1998-05-14 | 2000-06-27 | The Regents Of The University Of Michigan | Stretcher-compressor assembly having a single grating |
| US20030189756A1 (en) * | 2002-04-08 | 2003-10-09 | The Regents Of The University Of California | Short pulse laser stretcher-compressor using a single common reflective grating |
| CN1870359A (en) * | 2006-04-12 | 2006-11-29 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching and compressing device |
| US20090323740A1 (en) * | 2006-01-23 | 2009-12-31 | Stadler Andrew D | Systems And Methods For Control Of Ultra Short Pulse Amplification |
| US7777940B1 (en) * | 2007-02-09 | 2010-08-17 | University Of Central Florida Research Foundation, Inc. | Extreme chirped pulse amplification and phase control |
| CN102244352A (en) * | 2011-06-13 | 2011-11-16 | 中国工程物理研究院激光聚变研究中心 | Method for amplifying short pulse laser |
| CN102323704A (en) * | 2011-09-13 | 2012-01-18 | 中国科学院上海光学精密机械研究所 | Dispersion accommodation device |
| CN103116240A (en) * | 2012-12-12 | 2013-05-22 | 湖南大学 | Chirped pulse compressor based on forbidden band reflection |
| CN103872568A (en) * | 2014-02-26 | 2014-06-18 | 中国科学院上海光学精密机械研究所 | Chirped pulse stretching compression amplification system for eliminating high-order dispersion |
| CN108459367A (en) * | 2018-02-27 | 2018-08-28 | 封建胜 | High contrast chirp body grating and its control method for improving chirped pulse contrast |
| CN207910231U (en) * | 2018-03-15 | 2018-09-25 | 武汉锐科光纤激光技术股份有限公司 | Monolithic chirp body grating carries out the device of chirped pulse broadening and compression |
| CN209561848U (en) * | 2019-03-27 | 2019-10-29 | 刘振林 | Pulse shortener and femtosecond pulse laser |
| CN113904209A (en) * | 2020-06-22 | 2022-01-07 | 深圳市欧凌镭射科技有限公司 | Chirp pulse compression device and laser |
-
2022
- 2022-03-24 CN CN202210291712.8A patent/CN114389133A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081543A (en) * | 1998-05-14 | 2000-06-27 | The Regents Of The University Of Michigan | Stretcher-compressor assembly having a single grating |
| US20030189756A1 (en) * | 2002-04-08 | 2003-10-09 | The Regents Of The University Of California | Short pulse laser stretcher-compressor using a single common reflective grating |
| US20090323740A1 (en) * | 2006-01-23 | 2009-12-31 | Stadler Andrew D | Systems And Methods For Control Of Ultra Short Pulse Amplification |
| CN1870359A (en) * | 2006-04-12 | 2006-11-29 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching and compressing device |
| US7777940B1 (en) * | 2007-02-09 | 2010-08-17 | University Of Central Florida Research Foundation, Inc. | Extreme chirped pulse amplification and phase control |
| CN102244352A (en) * | 2011-06-13 | 2011-11-16 | 中国工程物理研究院激光聚变研究中心 | Method for amplifying short pulse laser |
| CN102323704A (en) * | 2011-09-13 | 2012-01-18 | 中国科学院上海光学精密机械研究所 | Dispersion accommodation device |
| CN103116240A (en) * | 2012-12-12 | 2013-05-22 | 湖南大学 | Chirped pulse compressor based on forbidden band reflection |
| CN103872568A (en) * | 2014-02-26 | 2014-06-18 | 中国科学院上海光学精密机械研究所 | Chirped pulse stretching compression amplification system for eliminating high-order dispersion |
| CN108459367A (en) * | 2018-02-27 | 2018-08-28 | 封建胜 | High contrast chirp body grating and its control method for improving chirped pulse contrast |
| CN207910231U (en) * | 2018-03-15 | 2018-09-25 | 武汉锐科光纤激光技术股份有限公司 | Monolithic chirp body grating carries out the device of chirped pulse broadening and compression |
| CN209561848U (en) * | 2019-03-27 | 2019-10-29 | 刘振林 | Pulse shortener and femtosecond pulse laser |
| CN113904209A (en) * | 2020-06-22 | 2022-01-07 | 深圳市欧凌镭射科技有限公司 | Chirp pulse compression device and laser |
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