CN118610879A - Method for modulating output pulse laser of quasi-continuous laser - Google Patents
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Abstract
The invention relates to laser modulation, and particularly discloses a method for modulating output pulse laser of a quasi-continuous laser, which comprises the steps of detecting the pulse width and time domain shape of laser pulse output by the laser, and judging whether the laser pulse modulation is needed; if necessary, the average power of the pumping pulse is increased to make the power between the output adjacent laser pulses not be zero, and the target characteristics of the pumping pulse are modulated to make the difference between the pulse width and the time domain shape of the laser pulse and the pumping pulse within the allowable range, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized by modulating the target characteristics of the pumping pulse. The invention realizes the modulation of the output laser pulse by modulating the pump light source pulse, does not need to additionally increase equipment, and reduces the complexity and cost of the system.
Description
Technical Field
The invention relates to laser modulation, in particular to a method for modulating output pulse laser of a quasi-continuous laser.
Background
The quasi-continuous laser has the advantages of high pulse power, small thermal effect, flexible beam waveform, pulse modulation and shaping and the like, and has wide application in the fields of micro-component processing, medical treatment and the like. Currently, many applications require that the quasi-continuous laser light output by an optical fiber or solid state laser have a specific pulse width and temporal shape. Therefore, the quasi-continuous laser capable of pulse width and time domain shape control has important potential application value in the fields of laser medical treatment, molecular spectroscopy, material processing and the like.
There are two modes of modulating the pulse width and the time domain shape of the laser, one mode is to add an optical element, such as a nonlinear crystal, in the resonant cavity to absorb the relaxation oscillation of the laser, so as to achieve the purpose of modulating the pulse width and the time domain shape of the laser pulse, and the other mode is to add negative feedback outside the resonant cavity, and modulate the pulse width and the time domain shape of the laser pulse by detecting current and voltage. Both of these approaches require additional equipment, add complexity to the system, take up space, and add cost.
Disclosure of Invention
In order to solve the problems, the invention provides a method for modulating output pulse laser of a quasi-continuous laser, which realizes the modulation of output laser pulse by modulating the pulse of a pumping light source, does not need to increase extra equipment and reduces the complexity and cost of a system.
The technical scheme of the invention is a quasi-continuous laser output pulse laser modulation method, which comprises the following steps:
Detecting the pulse width and the time domain shape of the laser pulse output by the laser, and judging whether laser pulse modulation is needed or not;
If necessary, the average power of the pumping pulse is increased to make the power between the output adjacent laser pulses not be zero, and the target characteristics of the pumping pulse are modulated to make the difference between the pulse width and the time domain shape of the laser pulse and the pumping pulse within the allowable range, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized by modulating the target characteristics of the pumping pulse.
In an alternative embodiment, detecting the pulse width and the time domain shape of the laser pulse output by the laser to determine whether the laser pulse modulation is needed, specifically includes:
Acquiring the pulse width and the time domain shape of the pumping pulse;
Detecting whether the pulse width and the time domain shape of the laser pulse output by the laser are the same as those of the pump pulse or not, and detecting whether the laser pulse is accompanied with relaxation oscillation or not;
if the laser pulse is different and is accompanied by relaxation oscillation, laser pulse modulation is needed; otherwise, laser pulse modulation is not required.
In an alternative embodiment, the target characteristic of the pump pulse is a pulse width.
In an alternative embodiment, the target feature of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and the modulation of the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target feature, specifically including:
Width-adjusting the pulse width of the pumping pulse until the difference between the pulse width and the time domain shape of the laser pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
and the pulse width and the time domain shape of the laser pulse generated by increasing the pulse width of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
In an alternative embodiment, the target characteristic of the pump pulse is peak power.
In an alternative embodiment, the target feature of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and the modulation of the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target feature, specifically including:
The peak power of the pumping pulse is increased until the relaxation oscillation of the laser pulse is suppressed, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
And then the pulse width and the time domain shape of the laser pulse generated by improving the peak power of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
In an alternative embodiment, the target characteristic of the pump pulse is a repetition frequency.
In an alternative embodiment, the target feature of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and the modulation of the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target feature, specifically including:
the repetition frequency of the pumping pulse is increased until the relaxation oscillation of the laser pulse is restrained, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
and then the pulse width and the time domain shape of the laser pulse generated by improving the repetition frequency of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
In an alternative embodiment, the time domain shape of the pump pulse is a gaussian pulse, a lorentz shape or a search 2 shape.
Compared with the prior art, the method for modulating the output pulse laser of the quasi-continuous laser has the following beneficial effects: when the laser pulse needs to be modulated, the relaxation oscillation in the output pulse is restrained by modulating the pumping pulse, and when the relaxation oscillation is restrained effectively, the output pulse has the pulse and time domain shape similar to the pumping pulse, so that the aim of controlling the pulse width and time domain shape of the output pulse is achieved, extra equipment is not needed, the complexity and cost of the system are reduced, and the precision of quasi-continuous laser pulse modulation can be ensured.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for modulating output pulse laser of a quasi-continuous laser according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a method of controlling the pulse width and time domain shape of a generated laser pulse by pump modulation.
Fig. 3 is a schematic diagram of a transition of the generated laser from a gain switching state to a quasi-continuous state by increasing the peak power of the pump pulse.
Fig. 4 is a schematic diagram of the transition of the generated laser from the gain switching state to the quasi-continuous state by increasing the pulse width of the pump pulse.
Fig. 5 is a schematic diagram of the transition of the generated laser from the gain switching state to the quasi-continuous state by increasing the repetition frequency of the pump pulse.
Fig. 6 is a schematic diagram showing that the pulse width of the output laser is kept approximately equal to the pulse width of the pump pulse, and the pulse width of the output laser is controlled by managing the pulse width of the pump pulse.
Fig. 7 is a schematic diagram showing the control of the time-domain shape of the output laser by managing the shape of the pump pulse, while maintaining the time-domain shape of the output laser approximately the same as the shape of the pump pulse.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention utilizes the modulation of the pumping pulse to restrain the relaxation oscillation in the output pulse, and when the relaxation oscillation is restrained effectively, the output pulse has the pulse and time domain shape similar to the pumping pulse, thereby achieving the purpose of controlling the pulse width and time domain shape of the output pulse.
The mechanism for suppressing relaxation oscillations in the laser pulses generated by the laser is: modulating the pumping light into smooth and gentle pulses with the time domain shape and the pumping pulse width of tens to hundreds of microseconds so as to prevent relaxation oscillation caused by abrupt change of pumping power; in this case, by increasing the peak power, or pulse width, or repetition frequency of the pump pulse to a certain range, the generated laser pulse and the pump pulse have equal repetition frequency and approximately equal pulse width, and the power between every two adjacent laser pulses is not zero, and the non-zero laser power serves as the seed light of the next laser pulse; when the non-zero power reaches a certain value, relaxation oscillation in the generated laser pulse can be effectively inhibited, and then quasi-continuous laser pulses with the pulse width and the time domain shape similar to those of the pumping pulse are generated.
Based on the above principle, the embodiment of the invention provides a method for modulating output pulse laser of a quasi-continuous laser, which comprises the steps of firstly detecting the pulse width and the time domain shape of laser pulse output by the laser, and judging whether the laser pulse modulation is needed; when modulation is needed, the average power of the pumping pulse is increased to ensure that the power between the output adjacent laser pulses is not zero, and meanwhile, the target characteristic of the pumping pulse is modulated to ensure that the difference between the pulse width and the time domain shape of the laser pulse and the pumping pulse is in an allowable range, and the modulation of the pulse width and the time domain shape of the laser pulse is realized by modulating the target characteristic of the pumping pulse. Specifically, relaxation oscillation in generating laser pulses is suppressed by modulating the time-domain shape and average power of the pump pulses, thereby obtaining quasi-continuous laser pulses with pulse width and time-domain shape similar to those of the pump pulses. As shown in fig. 1, the method includes the following steps.
S1, selecting a proper laser for pumping according to the time domain shape of the pumping pulse.
The embodiment modulates the pump light into smooth and gentle pulses with a time domain shape, and the pump pulse width is tens to hundreds of microseconds to prevent relaxation oscillation due to abrupt change of pump power. The time domain shape of the pump pulse is chosen to be a smooth and gentle shape, such as a gaussian pulse, a lorentz shape or a search 2 shaped pulsed laser.
S2, detecting the pulse width and the time domain shape of the laser pulse output by the laser, and judging whether laser pulse modulation is needed.
S2.1, acquiring the pulse width and the time domain shape of the pumping pulse.
S2.2, detecting whether the pulse width and the time domain shape of the laser pulse output by the laser are the same as those of the pump pulse, and detecting whether the laser pulse is accompanied with relaxation oscillation.
S2.3, if the laser pulses are different and are accompanied by relaxation oscillation, laser pulse modulation is needed; otherwise, laser pulse modulation is not required.
The embodiment judges whether the laser pulse is required to be modulated according to whether the pulse width and the time domain shape of the laser pulse and the pump pulse are consistent or not and whether relaxation oscillation is accompanied or not. Modulation is required if the pulse width and time domain shape of the laser pulse and the pump pulse are not identical, accompanied by relaxation oscillations.
And S3, if necessary, increasing the average power of the pumping pulse to ensure that the power between the output adjacent laser pulses is not zero, and modulating the target characteristic of the pumping pulse to ensure that the difference between the pulse width and the time domain shape of the laser pulse and the pumping pulse is in an allowable range, thereby realizing the modulation of the pulse width and the time domain shape of the laser pulse by modulating the target characteristic of the pumping pulse.
In the embodiment, the peak power, or the pulse width or the repetition frequency of the pumping pulse is increased to a certain range, so that the generated laser pulse and the pumping pulse have equal repetition frequency and approximately equal pulse width, the power between every two adjacent laser pulses is not zero, and the laser power which is not zero serves as seed light of the next laser pulse; when the non-zero power reaches a certain value, relaxation oscillation in the generated laser pulse can be effectively inhibited, and then quasi-continuous laser pulses with the pulse width and the time domain shape similar to those of the pumping pulse are generated. The target characteristic of the modulated pump pulse may be any of pulse width, peak power, repetition frequency.
(1) The target feature is pulse width, modulating the pulse width of the pump pulse.
Step 1, the pulse width of the pumping pulse is widened until the difference between the pulse width and the time domain shape of the laser pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range.
And 2, increasing the pulse width and the time domain shape of the laser pulse generated by the pulse width of the pumping pulse, wherein the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse are within an allowable range, and realizing the modulation of the pulse width and the time domain shape of the laser pulse.
The pulse width range is selected to be in the interval of tens of microseconds to hundreds of microseconds. When the pulse width and shape of the output laser pulse are different from the pump pulse and are accompanied by relaxation oscillation, the pulse width of the pump pulse can be adjusted to be wide until the laser pulse width and the time domain shape are basically consistent with the pump pulse. At this time, the pumping pulse is added, and the pulse width and the time domain shape of the generated laser pulse are kept consistent with those of the pumping pulse, so that the purpose of controlling the pulse width and the time domain shape of the laser pulse by modulating the pulse width of the pumping pulse is achieved.
(2) The target characteristic of the pump pulse is peak power, which is modulated.
Step 1, the peak power of the pumping pulse is increased until the relaxation oscillation of the laser pulse is suppressed, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse are within an allowable range.
And 2, improving the pulse width and the time domain shape of the laser pulse generated by the peak power of the pumping pulse, wherein the difference between the pulse width and the time domain shape of the pumping pulse and the difference between the pulse width and the time domain shape of the pumping pulse are within an allowable range, and realizing the modulation of the pulse width and the time domain shape of the laser pulse.
When the pulse width of the output laser pulse is unequal to the pulse width of the pumping pulse, the shape is different from the time domain shape of the pumping pulse and the relaxation oscillation is accompanied, the peak power of the pumping pulse can be increased until the relaxation oscillation of the laser pulse is restrained, and the pulse width and the shape are approximately the same as the pulse width and the shape of the pumping pulse. At this time, the peak power of the pumping pulse is increased, and the pulse width and the time domain shape of the generated laser pulse are approximately consistent with those of the pumping pulse, so that the purpose of controlling the pulse width and the time domain shape of the laser pulse by modulating the peak power of the pumping pulse is achieved.
(3) The target feature is a repetition frequency that modulates the repetition frequency of the pump pulses.
Step 1, the repetition frequency of the pumping pulse is increased until the relaxation oscillation of the laser pulse is suppressed, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse are within an allowable range.
And 2, improving the pulse width and the time domain shape of the laser pulse generated by the repetition frequency of the pumping pulse, wherein the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse are within an allowable range, and realizing the modulation of the pulse width and the time domain shape of the laser pulse.
When the pulse width of the output laser pulse is unequal to the pulse width of the pumping pulse, the shape is different from the time domain shape of the pumping pulse and is accompanied by relaxation oscillation, the repetition frequency of the pumping pulse can be increased until the relaxation oscillation of the laser pulse is restrained, and the pulse width and the shape are approximately the same as the pulse width and the shape of the pumping pulse. At this time, the repetition frequency of the pumping pulse is increased, and the pulse width and the time domain shape of the generated laser pulse are approximately consistent with those of the pumping pulse, so that the purpose of controlling the pulse width and the time domain shape of the laser pulse by modulating the repetition frequency of the pumping pulse is achieved.
Whether the pulse width of the pumping pulse is increased, the peak power is increased or the repetition frequency is increased, the average power of the pumping pulse is increased, and the control of the pumping pulse is realized. In the present method it is necessary to increase the average power of the pump pulses to a value such that the power between adjacent laser pulses generated is not zero. In summary, the control of the pulse width and shape of the generated laser pulses is achieved by the regulation of the pump pulses.
FIG. 2 is a schematic diagram of a method for controlling the pulse width and time domain shape of a laser pulse generated by pump modulation, wherein the pump pulse of the quasi-continuous laser with controllable pulse width and time domain shape is a laser pulse with smooth time domain shape, gentle rising edge and falling edge and pulse width of tens of microseconds to hundreds of microseconds; on the premise that the laser pulse with the pulse width and the time domain shape approximately the same as those of the pump pulse can be generated by increasing the average power of the pump pulse to a certain extent, namely, the pulse width and the shape of the generated laser pulse are controlled by managing the pulse width and the shape of the pump pulse.
The following is a specific description in connection with examples of numerical simulations.
In an Er: ZBLAN fiber laser: the wavelength of the pumping source is 976nm, and the pulse width is 50To 200Continuously adjustable, wherein the power is continuously adjustable from 0W to 20W, and the pump pulse shape is set to be the shape of second-order Gaussian, fourth-order Gaussian and sixth-order Gaussian pulses; the gain fiber is Er-ZBLAN fiber with length of 1.2m and fiber core diameter of 16.5Inner cladding diameter 250; The two cavity mirrors of the resonant cavity are formed by the gold-plated planar high-reflection mirror and the vertically cut fiber end face.
The Er-ZBLAN fiber laser is subjected to numerical simulation by utilizing an algorithm combining finite difference and Dragon library tower, and the following numerical simulation result is obtained.
The transition of the generated laser from the gain switching state to the quasi-continuous state (the top graph in the figure is a typical gain switching state, the middle graph is a quasi-continuous state with relaxation oscillation, and the bottom graph is a smooth and stable quasi-continuous state) is shown in fig. 3 by increasing the peak power of the pump pulse. At the pump pulse of second order Gaussian pulse, repetition frequency of 1kHz and pulse duration of 100At this time, as the peak power of the pump pulse increases (from 5W to 15W), the generated laser pulse gradually transitions from the gain switching pulse to a quasi-continuous pulse with relaxation oscillation, eventually becoming a smooth quasi-continuous pulse. The laser pulse generated at this time has approximately the same pulse width and shape as the pump pulse. The results illustrate that when the pump pulse has a suitable time-domain shape and pulse width, relaxation oscillations can be suppressed by increasing the peak power of the pump pulse so that the resulting laser pulse is a smooth, stable, quasi-continuous pulse with approximately the same pulse width and shape as the pump pulse.
The transition of the generated laser from the gain switching state to the quasi-continuous state by increasing the pulse width of the pump pulse is shown in fig. 4 (the uppermost diagram is a typical gain switching state, the middle diagram is a quasi-continuous state with relaxation oscillation, and the lowermost diagram is a smooth and stable quasi-continuous state). When the pump pulse is second-order Gaussian pump, the repetition frequency is 1kHz, the pulse peak power is 20W, the pulse width is increased (from 50Up to 100) The generated laser pulse gradually transits from the gain switching pulse to the quasi-continuous pulse with relaxation oscillation, and finally becomes a smooth quasi-continuous pulse. The laser pulse generated at this time has approximately the same pulse width and shape as the pump pulse. The result shows that in the case of a pump pulse having a suitable time-domain shape, relaxation oscillations can be suppressed by increasing the pulse width of the pump pulse, so that the generated laser pulse is a smooth and stable quasi-continuous pulse with approximately the same pulse width and shape as the pump pulse.
The transition of the generated laser from the gain switching state to the quasi-continuous state by increasing the repetition frequency of the pump pulse is shown in fig. 5 (the uppermost diagram is the gain switching state, the middle diagram is the quasi-continuous state with relaxation oscillation, and the lowermost diagram is the smooth and stable quasi-continuous state). Pulse duration 100 under pump pulse of second order GaussianAt peak power 15W, the generated laser pulse gradually transitions from the gain switching pulse to the quasi-continuous pulse with relaxation oscillation, eventually becoming a smooth quasi-continuous pulse, with increasing pump pulse repetition frequency (from 2kHz to 3.5 kHz). The laser pulse generated at this time has approximately the same pulse width and shape as the pump pulse. The result shows that in the case of a pump pulse having a suitable time-domain shape, relaxation oscillations can be suppressed by increasing the repetition frequency of the pump pulse, so that the generated laser pulse is a smooth and stable quasi-continuous pulse with approximately the same pulse width and shape as the pump pulse.
As shown in fig. 6, it is demonstrated that the pulse width of the output laser remains approximately equal to the pulse width of the pump pulse, enabling control of the pulse width of the output laser by managing the pulse width of the pump pulse. When the pumping pulse is a second-order Gaussian pulse, the repetition frequency is 1kHz and the pulse peak power is 20W, the pulse width of the generated laser pulse is approximately equal to the pulse width of the pumping pulse when the pulse width of the pumping pulse is changed, so that the pulse width of the output laser is regulated and controlled.
As shown in fig. 7, it is demonstrated that the temporal shape of the output laser remains approximately the same as the shape of the pump pulse, enabling the control of the temporal shape of the output laser by managing the shape of the pump pulse. At a repetition frequency of 1kHz, a pulse peak power of 20W, a pulse width of 100When the ultra-high-order pulse pumping with different orders is adopted, the time domain shape of the output laser pulse is approximately consistent with the time domain shape of the pumping pulse, and the regulation and control of the pulse time domain shape of the output laser is realized.
The foregoing disclosure is merely illustrative of the preferred embodiments of the invention and the invention is not limited thereto, since modifications and variations may be made by those skilled in the art without departing from the principles of the invention.
Claims (9)
1. A method for modulating a quasi-continuous laser output pulse laser, comprising the steps of:
Detecting the pulse width and the time domain shape of the laser pulse output by the laser, and judging whether laser pulse modulation is needed or not;
If necessary, the average power of the pumping pulse is increased to make the power between the output adjacent laser pulses not be zero, and the target characteristics of the pumping pulse are modulated to make the difference between the pulse width and the time domain shape of the laser pulse and the pumping pulse within the allowable range, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized by modulating the target characteristics of the pumping pulse.
2. The method for modulating output pulse laser light of quasi-continuous laser according to claim 1, wherein detecting pulse width and time domain shape of laser pulse output by laser to determine whether laser pulse modulation is required comprises:
Acquiring the pulse width and the time domain shape of the pumping pulse;
Detecting whether the pulse width and the time domain shape of the laser pulse output by the laser are the same as those of the pump pulse or not, and detecting whether the laser pulse is accompanied with relaxation oscillation or not;
if the laser pulse is different and is accompanied by relaxation oscillation, laser pulse modulation is needed; otherwise, laser pulse modulation is not required.
3. The method of claim 2, wherein the target characteristic of the pump pulse is pulse width.
4. A method of modulating a pulse laser output according to claim 3, wherein the target characteristic of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and further modulating the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target characteristic, specifically comprising:
Width-adjusting the pulse width of the pumping pulse until the difference between the pulse width and the time domain shape of the laser pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
and the pulse width and the time domain shape of the laser pulse generated by increasing the pulse width of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
5. The method of claim 2, wherein the target characteristic of the pump pulse is peak power.
6. The method of claim 5, wherein the target feature of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and further modulating the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target feature, specifically comprising:
The peak power of the pumping pulse is increased until the relaxation oscillation of the laser pulse is suppressed, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
And then the pulse width and the time domain shape of the laser pulse generated by improving the peak power of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
7. The method of modulating a quasi-continuous laser output pulse laser of claim 2, wherein the target characteristic of the pump pulse is a repetition rate.
8. The method of claim 5, wherein the target feature of the pump pulse is modulated such that the difference between the pulse width and the time domain shape of the laser pulse and the pump pulse is within an allowable range, and further modulating the pulse width and the time domain shape of the laser pulse is achieved by modulating the pump target feature, specifically comprising:
the repetition frequency of the pumping pulse is increased until the relaxation oscillation of the laser pulse is restrained, and the difference between the pulse width and the time domain shape of the pumping pulse and the pulse width and the time domain shape of the pumping pulse is within an allowable range;
and then the pulse width and the time domain shape of the laser pulse generated by improving the repetition frequency of the pumping pulse are within the allowable range with the difference between the pulse width and the time domain shape of the pumping pulse, so that the modulation of the pulse width and the time domain shape of the laser pulse is realized.
9. The method of any one of claims 1-8, wherein the time domain shape of the pump pulse is gaussian, lorentz or search 2.
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