CN118315908B - Passive mode-locked fiber laser with polymorphic solitons - Google Patents
Passive mode-locked fiber laser with polymorphic solitons Download PDFInfo
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
The invention discloses a passive mode-locked fiber laser with polymorphic solitons, and relates to the technical field of lasers. The first optical circulator, the polarization controller, the saturable absorber and the pump driving module are sequentially connected with the second optical circulator; the first optical circulator, the first output coupler, the single-mode optical fiber and the second optical circulator are sequentially connected; and forming a first resonant cavity with the polarization controller, the saturable absorber and the pump driving module so as to adjust the polarization controller and output a broadening pulse through a first output coupler; the second optical circulator, the second output coupler, the polarization maintaining optical fiber and the first optical circulator are sequentially connected; and a second resonant cavity is formed with the polarization controller, the saturable absorber and the pump driving module, so that the polarization controller is conveniently adjusted to change the coupling angle of the light pulse passing through the polarization maintaining optical fiber, and the birefringence management soliton or the dissipation soliton is output through the second output coupler so as to meet various requirements of various soliton pulse outputs of the laser.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a passive mode-locked fiber laser with polymorphic solitons.
Background
The high-power passive mode-locking fiber laser has high energy pulse output, ultrafast pulse width, high beam quality, small volume, stability and long service life, and is widely applied to the fields of material processing, ultrafast imaging, accurate cutting, scientific research and the like.
Because the resonant cavity of the laser has fixed net dispersion parameters, most mode-locked fiber lasers can only output soliton pulses of one type once the resonant cavity is built, so that one laser cannot meet the requirement of multiple purposes, and the cost is correspondingly increased.
Therefore, how to improve the flexibility of multiple soliton pulse outputs of a laser to meet the requirement of multiple uses is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a passive mode-locked fiber laser with polymorphic solitons, which aims to solve the technical problem that the traditional laser only outputs soliton pulses of one type so as to not meet the requirement of multiple purposes, thereby causing higher cost.
In order to solve the technical problems, the invention provides a passive mode-locked fiber laser with polymorphic solitons, which comprises a pump driving module, a first optical circulator, a second optical circulator, a polarization controller, a saturable absorber, a single-mode fiber and a polarization maintaining fiber;
the first optical circulator, the polarization controller, the saturable absorber, the pump driving module and the second optical circulator are sequentially connected;
The first optical circulator, the first output coupler, the single-mode optical fiber and the second optical circulator are sequentially connected; and forming a first resonant cavity with the polarization controller, the saturable absorber and the pump driving module so as to adjust the polarization controller and output a broadened pulse through the first output coupler;
The second optical circulator, the second output coupler, the polarization maintaining optical fiber and the first optical circulator are sequentially connected; and a second resonant cavity is formed with the polarization controller, the saturable absorber and the pump driving module, so that the polarization controller is conveniently adjusted to change the coupling angle of the light pulse passing through the polarization maintaining optical fiber, and the birefringence management soliton or the dissipation soliton is output through the second output coupler.
In one aspect, the first resonant cavity has a net dispersion value of zero and the second resonant cavity has a net dispersion value of positive.
On the other hand, adjusting the polarization controller to change the coupling angle of two orthogonal polarization components when the light pulse passes through the polarization maintaining fiber so as to output the birefringence management soliton or the dissipation soliton;
Correspondingly, outputting the dissipative soliton when the coupling angle is 0 DEG or 90 DEG;
and outputting the birefringence management soliton when the coupling angle is any angle except 0 DEG and 90 deg.
In another aspect, the pump driving module includes a first pump light source, a first wavelength division multiplexer, an erbium-doped fiber, a second wavelength division multiplexer, and a second pump light source;
the first pumping light source is connected with the first end of the first wavelength division multiplexer, and the second end of the first wavelength division multiplexer is connected with the saturable absorber; the third end of the first wavelength division multiplexer is connected with the first end of the erbium-doped optical fiber; the second end of the erbium-doped fiber is connected with the third end of the second wavelength division multiplexer; the second end of the second wavelength division multiplexer is connected with the second end of the second optical circulator, and the first end of the second wavelength division multiplexer is connected with the second pumping light source.
In another aspect, the pump drive module includes a pump light source, a wavelength division multiplexer, and an erbium-doped fiber;
The pumping light source is connected with the first end of the wavelength division multiplexer; a second end of the wavelength division multiplexer is connected with the saturable absorber; the third end of the wavelength division multiplexer is connected with the first end of the erbium-doped fiber; a second end of the erbium doped fiber is connected to a second end of the second optical circulator.
In another aspect, the first end of the second output coupler is connected to the third end of the second optical circulator; the second end of the second output coupler is connected with the polarization maintaining optical fiber; and the third end of the second output coupler is used for outputting a birefringence management soliton or a dissipative soliton.
In another aspect, the number of polarization controllers is one.
In another aspect, the polarization maintaining fiber has a length of 0.8m.
In another aspect, the saturable absorber is a graphene saturable absorber.
On the other hand, the working wavelength of the first pump light source and the second pump light source is 980nm or 1480nm.
The invention provides a passive mode-locked fiber laser with polymorphic solitons, which is characterized in that a first optical circulator, a polarization controller, a saturable absorber, a pumping driving module and a second optical circulator are sequentially connected; the first optical circulator, the first output coupler, the single-mode optical fiber and the second optical circulator are sequentially connected; and forming a first resonant cavity with the polarization controller, the saturable absorber and the pump driving module so as to adjust the polarization controller and output a broadening pulse through a first output coupler; the second optical circulator, the second output coupler, the polarization maintaining optical fiber and the first optical circulator are sequentially connected; and a second resonant cavity is formed with the polarization controller, the saturable absorber and the pump driving module, so that the polarization controller is conveniently adjusted to change the coupling angle of the light pulse passing through the polarization maintaining fiber, and the birefringence management soliton or the dissipation soliton is output through the second output coupler. The invention can generate the three-state solitons of stretching pulse, double refraction management solitons and dissipation solitons in the same laser by adjusting the polarization controller so as to meet various requirements of the output of various soliton pulses of the laser. Specifically, a second resonant cavity formed by the polarization maintaining optical fiber is added to adjust the coupling angle of the polarization maintaining optical fiber under the polarization controller, so as to generate coupling effect and output different solitons. Meanwhile, the cost problem of soliton output is also reduced.
Drawings
For a clearer description of embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a diagram of a passive mode-locked fiber laser with polymorphic solitons according to an embodiment of the present invention;
FIG. 2 is a spectral graph of a first output coupler outputting stretched pulses according to an embodiment of the present invention;
FIG. 3 is an autocorrelation graph of a first output coupler output spread pulse provided by an embodiment of the present invention;
FIG. 4 is a graph showing a spectrum of a second output coupler output birefringence management soliton according to an embodiment of the present invention;
FIG. 5 is a graph showing the autocorrelation of the output birefringence management soliton of the second output coupler according to the embodiment of the present invention;
FIG. 6 is a graph of a spectrum of a second output coupler output dissipative soliton according to an embodiment of the invention;
Fig. 7 is an autocorrelation graph of an output dissipative soliton of a second output coupler according to an embodiment of the invention.
The reference numerals are as follows:
1-a pump drive module; 2-a first optical circulator; 3-a second optical circulator; 4-polarization controller; a 5-saturable absorber; 6-single mode optical fiber; 7-polarization maintaining optical fiber; 8-a first output coupler; 9-a second output coupler; 10-a first pump light source; 11-a first wavelength division multiplexer; 12-erbium-doped optical fiber; 13-a second wavelength division multiplexer; 14-a second pump light source.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
The core of the invention is to provide a passive mode-locked fiber laser with polymorphic solitons, so as to solve the technical problem that the traditional laser only outputs soliton pulses of one type, so that the requirement of multiple purposes cannot be met, and the cost is high.
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.
In order to realize polymorphic soliton output in a mode-locked fiber laser, effective dispersion and nonlinear management are important. The following methods have been adopted to realize polymorphic soliton output, such as bidirectional mode locking and complex cavity type structures. However, these methods still face challenges in achieving more than two types of soliton pulses.
The saturable absorber is a nonlinear optical element capable of converting a laser continuous wave into a mode-locked pulse. Various types of nanomaterials have been used as saturable absorbers to produce ultrashort pulses in passive mode-locked fiber lasers. Among these materials, graphene has outstanding advantages in terms of generation of ultrashort pulses due to its absorption spectrum being continuously tunable across the ultraviolet to mid-infrared band, the operating wavelength being ultra-wideband, and the electron relaxation time being extremely short. Therefore, the passive mode-locked fiber laser with the polymorphic soliton can solve the technical problems.
Fig. 1 is a structural diagram of a passive mode-locked fiber laser with polymorphic solitons, provided in an embodiment of the present invention, where the passive mode-locked fiber laser, as shown in fig. 1, includes a pump driving module 1, a first optical circulator 2, a second optical circulator 3, a polarization controller 4, a saturable absorber 5, a single-mode fiber 6, and a polarization maintaining fiber 7;
The first optical circulator 2, the polarization controller 4, the saturable absorber 5, the pump driving module 1 and the second optical circulator 3 are sequentially connected;
The first optical circulator 2, the first output coupler 8 and the single-mode optical fiber 6 are sequentially connected with the second optical circulator 3; and forms a first resonant cavity with the polarization controller 4, the saturable absorber 5 and the pump driving module 1 so as to adjust the polarization controller 4 and output a broadened pulse through the first output coupler 8;
The second optical circulator 3, the second output coupler 9 and the polarization maintaining fiber 7 are sequentially connected with the first optical circulator 2; and forms the second resonant cavity with the polarization controller 4, the saturable absorber 5 and the pump driving module 1, so as to adjust the polarization controller 4 to change the coupling angle of the light pulse passing through the polarization maintaining fiber 7, and outputs the birefringence management soliton or the dissipation soliton through the second output coupler 9.
Specifically, the first resonant cavity is connected by a pump driving module, a saturable absorber, a polarization controller, a first optical circulator, a first output coupler, a single-mode fiber and a second optical circulator through a single-mode fiber in a closed loop manner, and negative dispersion compensation is introduced to enable the net dispersion of the first resonant cavity to be zero. And outputting the stretched pulse at the output of the first output coupler by adjusting the polarization controller.
The second resonant cavity is formed by connecting a pump driving module, a saturable absorber, a polarization controller, a first optical circulator, a polarization maintaining optical fiber, a second output coupler and a second optical circulator through a single-mode optical fiber in a closed loop manner, the net dispersion of the second resonant cavity is positive, the coupling angle of two orthogonal polarization components can be changed when an optical pulse passes through the polarization maintaining optical fiber through adjusting the polarization controller, and a birefringent management soliton or a dissipative soliton is output at the second output coupler.
It can be appreciated that when the net dispersion is negative, a conventional soliton is output, the net dispersion is zero, a stretched pulse can be output, the net dispersion is positive, and the soliton is managed or dissipated based on different output birefringence of the coupling angle.
The operating state of the laser is related to the behavior of the coupling of the polarization states of the laser in the single mode fiber-polarization maintaining fiber. When the included angle theta between the polarization component along the y-axis direction in the single-mode fiber and the fast axis of the polarization maintaining fiber is 0 degree or 90 degrees, the fiber laser outputs a dissipation soliton with strong chirp; when θ is around 25 °, the fiber laser outputs a near zero chirped birefringence management soliton. The two orthogonal polarization components of the pulse have different center wavelengths and time domain positions. Unlike the self-similar pulses and dissipative solitons common in the positive dispersion region, the birefringent managed solitons have sharp spectral sidebands. The two sidebands of a single polarized component are asymmetric in position and intensity, with the stronger sideband corresponding to the resonant frequency that satisfies the phase match and the weaker sideband arising from the mode coupling of its orthogonal polarized components. Although the birefringence management soliton in the positive dispersion region and the traditional soliton in the negative dispersion region have similar spectrum shapes and chirp characteristics, the formation mechanism and evolution modes of the two are completely different, which indicates that the birefringence management soliton is a brand new type of mode locking pulse.
The pump driving module is used for realizing the introduction of pump light energy and realizing the stimulated radiation amplification of the pump light energy to form laser. The saturable absorber is used as a mode locking device for realizing bidirectional laser pulse mode locking operation. A single mode fiber is an optical fiber in which only one transmission mode exists. The transmission loss and transmission dispersion of the single-mode fiber are smaller. The small transmission loss can make the distance of signal transmission in the optical fiber longer, and the small transmission dispersion is beneficial to the transmission of high-speed and large-capacity data, so that single-mode optical fibers are mostly used in communication systems, particularly in large-capacity communication systems. In the process of drawing the polarization-maintaining optical fiber, the polarization-maintaining performance is reduced due to structural defects generated in the optical fiber, namely, when linearly polarized light is transmitted along one characteristic axis of the optical fiber, part of optical signals can be coupled into the other characteristic axis perpendicular to the linear polarized light, and finally, the polarization extinction ratio of the outgoing polarized optical signals is reduced, and the defects can influence the birefringent effect in the optical fiber. In the polarization-maintaining optical fiber, the stronger the birefringence effect is, the shorter the beat length is, and the better the polarization state of the transmitted light is maintained. Polarization maintaining fiber can solve the problem of polarization state change, but it cannot eliminate the birefringence phenomenon in the fiber, but rather, by designing the fiber geometry, a stronger birefringence effect is generated to eliminate the influence of stress on the polarization state of the incident light.
The number of polarization controllers may be one or more, and is not limited herein, and may be set according to practical situations.
The embodiment of the invention provides a passive mode-locked fiber laser with polymorphic solitons, which is characterized in that a first optical circulator, a polarization controller, a saturable absorber, a pump driving module and a second optical circulator are sequentially connected; the first optical circulator, the first output coupler, the single-mode optical fiber and the second optical circulator are sequentially connected; and forming a first resonant cavity with the polarization controller, the saturable absorber and the pump driving module so as to adjust the polarization controller and output a broadening pulse through a first output coupler; the second optical circulator, the second output coupler, the polarization maintaining optical fiber and the first optical circulator are sequentially connected; and a second resonant cavity is formed with the polarization controller, the saturable absorber and the pump driving module, so that the polarization controller is conveniently adjusted to change the coupling angle of the light pulse passing through the polarization maintaining fiber, and the birefringence management soliton or the dissipation soliton is output through the second output coupler. The invention can generate the three-state solitons of stretching pulse, double refraction management solitons and dissipation solitons in the same laser by adjusting the polarization controller so as to meet various requirements of the output of various soliton pulses of the laser. Specifically, a second resonant cavity formed by the polarization maintaining optical fiber is added to adjust the coupling angle of the polarization maintaining optical fiber under the polarization controller, so as to generate coupling effect and output different solitons. Meanwhile, the cost problem of soliton output is also reduced.
In some embodiments, the net dispersion value of the first resonator is zero and the net dispersion value of the second resonator is positive.
In order to realize the output of the tri-state soliton, when the net dispersion value is zero, outputting a broadening pulse; and outputting the birefringence management soliton or the dissipation soliton when the net dispersion value is positive.
Examples of specific control outputs are as follows: adjusting a polarization controller to change the coupling angle of two orthogonal polarization components when the light pulse passes through the polarization maintaining optical fiber so as to output a birefringence management soliton or a dissipation soliton;
Correspondingly, when the coupling angle is 0 DEG or 90 DEG, outputting dissipative solitons;
and outputting the birefringence management soliton at any angle except 0 DEG and 90 DEG of coupling angle.
Specifically, when the coupling angle is 0 ° or 90 °, the dissipative soliton is directly output without coupling effect because the net dispersion of the second resonant cavity is positive. And when the coupling angle is any other angle, a coupling effect exists, so that periodic disturbance is caused, and the birefringent management soliton with spectral sidebands is output.
In the soliton output process provided by the embodiment, based on the adjustment output of the polarization controller, solitons corresponding to different resonant cavity outputs are output, so that polymorphic soliton output is realized.
In some embodiments, as shown in fig. 1, the pump drive module 1 comprises a first pump light source 10, a first wavelength division multiplexer 11, an erbium doped fiber 12, a second wavelength division multiplexer 13, and a second pump light source 14;
The first pump light source 10 is connected with a first end of the first wavelength division multiplexer 11, and a second end of the first wavelength division multiplexer 11 is connected with the saturable absorber 5; the third end of the first wavelength division multiplexer 11 is connected with the first end of the erbium-doped fiber 12; a second end of the erbium-doped fiber 12 is connected to a third end of the second wavelength division multiplexer 13; a second end of the second wavelength division multiplexer 13 is connected to a second end of the second optical circulator 3, and a first end of the second wavelength division multiplexer 13 is connected to a second pump light source 14.
The two ends of the erbium-doped fiber are respectively connected with the first wavelength division multiplexer and the second wavelength division multiplexer, and are used for fully exciting impurity particles in the erbium-doped fiber and providing enough energy for amplifying signal light.
The pump light energy is injected into the laser in a bidirectional simultaneous pumping mode through the first pump light source and the second pump light source, and the erbium-doped optical fiber absorbs the light energy injected from the first pump light source and the second pump light source, so that continuous optical gain is provided for the generation of laser pulses. In this embodiment, two pumping light sources are provided, and the provided pumping energy is high, i.e. the corresponding output power is high.
As another embodiment, the pump drive module includes a pump light source, a wavelength division multiplexer, and an erbium-doped fiber;
The pumping light source is connected with the first end of the wavelength division multiplexer; the second end of the wavelength division multiplexer is connected with the saturable absorber 5; a third end of the wavelength division multiplexer is connected with a first end of the erbium-doped fiber 12; a second end of the erbium doped fiber 12 is connected to a second end of the second optical circulator 3.
It can be understood that the number of pump light sources in this embodiment is one, and the pump light energy is introduced based on one pump light source.
The specific connection relation of the pump driving modules in the embodiment shows the flexibility and universality of the introduction of the pump light source.
In some embodiments, the first end of the second output coupler is connected to the third end of the second optical circulator; the second end of the second output coupler is connected with the polarization maintaining fiber; the third end of the second output coupler is used for outputting a birefringence management soliton or a dissipative soliton.
As shown in fig. 1, the output end of the first pumping light source is connected with the a end of the first wavelength division multiplexer, the c end of the first wavelength division multiplexer is connected with the first end of the erbium-doped optical fiber, the second end of the erbium-doped optical fiber is connected with the c end of the second wavelength division multiplexer, the a end of the second wavelength division multiplexer is connected with the a end of the second pumping light source, the b end of the second wavelength division multiplexer is connected with the first end of the graphene saturable absorber, the second end of the graphene saturable absorber is connected with the first end of the polarization controller, the second end of the polarization controller is connected with the b end of the first optical circulator, the c end of the first optical circulator is connected with the a end of the first output coupler, the b end of the first output coupler is connected with the first end of the single-mode optical fiber, the second end of the single-mode optical fiber is connected with the a end of the second optical circulator, and the b end of the second optical circulator is connected with the b end of the second wavelength division multiplexer to form a first resonant cavity;
The output end of the second pumping light source is connected with the a end of the second wavelength division multiplexer, the c end of the second wavelength division multiplexer is connected with the first end of the erbium-doped optical fiber, the second end of the erbium-doped optical fiber is connected with the c end of the first wavelength division multiplexer, the a end of the first wavelength division multiplexer is connected with the output end of the first pumping light source, the b end of the second wavelength division multiplexer is connected with the b end of the second optical circulator, the c end of the second optical circulator is connected with the a end of the second output coupler, the b end of the second output coupler is connected with the first end of the polarization maintaining optical fiber, the second end of the polarization maintaining optical fiber is connected with the a end of the first optical circulator, the b end of the first optical circulator is connected with the first end of the polarization controller, the second end of the polarization controller is connected with the first end of the graphene saturable absorber, and the second end of the graphene saturable absorber is connected with the b end of the first wavelength division multiplexer to form a second resonant cavity.
It should be noted that, in this embodiment, the a end, the b end, and the c end of the first wavelength division multiplexer correspond to the first end, the second end, and the third end, respectively, and the a end, the b end, and the c end of the second wavelength division multiplexer correspond to the first end, the second end, and the third end, respectively. The representation forms of the ports corresponding to the first optical circulator, the second optical circulator, the first output coupler and the second output coupler are the same as those of the a end, the b end and the c end of the first wavelength division multiplexer and the second wavelength division multiplexer, and the description is omitted here.
In this embodiment, the second output coupler outputs two solitons through one output port, and compared with two output ports of other output couplers, the design cost of the device is reduced.
In some embodiments, the number of polarization controllers is one.
The more and more unstable the number of polarization controllers, a plurality of polarization controllers exist at present, and the polarization controllers are used for adjusting the birefringence effect of the optical fiber and the polarization state of the light beam in the cavity, so that the dispersion, nonlinear effect and self-modulation effect in the cavity are balanced, an initial mode locking pulse signal is generated, and the switching of different mode locking states is realized.
In the embodiment, the stable operation of the cavity is considered, the number of the polarization controllers is one, and the stable operation of the cavity is realized.
In some embodiments, the length of the polarization maintaining fiber is 0.8m.
Specifically, the birefringence management soliton is typically output at a length of 0.8 m.
In some embodiments, the saturable absorber is a graphene saturable absorber.
Specifically, the graphene saturable absorber is used as a mode locking device to realize high-power mode locking ultrashort pulse output.
In some embodiments, the first pump light source and the second pump light source each have an operating wavelength of 980nm or 1480nm.
Specifically, a semiconductor laser diode with the working wavelength of 980nm or 1480nm of the first pumping light source is connected with the first wavelength division multiplexer to realize pumping light energy introduction; the semiconductor laser diode with the working wavelength of 980nm or 1480nm of the second pumping light source is connected with the second wavelength division multiplexer to realize the pumping light energy introduction. After entering the wavelength division multiplexer, the wavelength enters the erbium-doped fiber, and particles with low energy level in the erbium-doped fiber are excited to transition to high energy level, and then amplified pulse light with the wavelength of about 1550nm is emitted. The 980nm pump end of the first wavelength division multiplexer needs to be connected with the 980nm pump source of the first pump light source, and the same is true if the working wavelength is 1480 nm. The connection relationship between the pump end and the pump source corresponding to the connection relationship between the second wavelength division multiplexer and the second pump light source is the same as the connection relationship between the first wavelength division multiplexer and the first pump light source, and will not be described again here.
In addition, with respect to a method of preparing a graphene saturable absorber, comprising the steps of:
s1: and removing the surface polymer coating layer on the single-mode quartz optical fiber with the length of 15cm, wiping the single-mode quartz optical fiber clean, and cutting the end face of the optical fiber by a cutter.
S2: placing clean optical fiber into graphite fixture, placing into tube furnace center, heating and vacuumizing
S3: when the tube furnace temperature reached 700 ℃, a mixed gas of CH 4:H2 =1:9 sccm was introduced.
S4: the plasma generator was turned on and reacted at 200W power for 50 minutes.
S5: and inserting the optical fiber with the graphene on the end face into a bare fiber adapter, and connecting the optical fiber with another single-mode optical fiber jumper wire through a flange to obtain the graphene saturable absorber based on the end face of the optical fiber.
Fig. 2 is a spectrum graph of a first output coupler output broadened pulse according to an embodiment of the present invention, and fig. 3 is an autocorrelation graph of a first output coupler output broadened pulse according to an embodiment of the present invention, where, as shown in fig. 2 and fig. 3, a center wavelength (λc) corresponding to a spectrum is 1563nm, a 3dB bandwidth (Δλ) of a spectrum is 7.2nm, and a pulse width is 680fs if a gaussian fitting is performed.
Fig. 4 is a spectrum graph of a second output coupler output birefringence management soliton according to an embodiment of the present invention, and fig. 5 is an autocorrelation graph of a second output coupler output birefringence management soliton according to an embodiment of the present invention, as shown in fig. 4 and fig. 5, a center wavelength (λc) corresponding to a spectrum is 1565nm, a 3dB bandwidth (Δλ) of a spectrum is 3.5nm, and a pulse width is 1.6ps if gaussian fitting is adopted.
Fig. 6 is a spectrum graph of a second output coupler output dissipative soliton according to an embodiment of the invention, and fig. 7 is an autocorrelation graph of a second output coupler output dissipative soliton according to an embodiment of the invention, as shown in fig. 6 and fig. 7, a center wavelength (λc) corresponding to a spectrum is 1565nm, a 3dB bandwidth (Δλ) of a spectrum is 14.2nm, and a pulse width is 20ps if gaussian fitting is adopted. As can be illustrated by fig. 2 to 7, the multi-state soliton pulse output is realized in the same all-fiber laser with compact structure.
The passive mode-locked fiber laser with the polymorphic soliton provided by the invention is described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that the present invention may be modified and practiced without departing from the spirit of the present invention.
It should also be noted that in this specification, relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Claims (9)
1. The passive mode-locked fiber laser of the polymorphic soliton is characterized by comprising a pump driving module (1), a first optical circulator (2), a second optical circulator (3), a polarization controller (4), a saturable absorber (5), a single-mode fiber (6) and a polarization maintaining fiber (7);
The first optical circulator (2), the polarization controller (4), the saturable absorber (5) and the pump driving module (1) are sequentially connected with the second optical circulator (3);
the first optical circulator (2), the first output coupler (8), the single-mode optical fiber (6) and the second optical circulator (3) are sequentially connected; and forming a first resonant cavity with the polarization controller (4), the saturable absorber (5) and the pump driving module (1) so as to adjust the polarization controller (4) and output a broadened pulse through the first output coupler (8); wherein the net dispersion value of the first resonant cavity is zero;
the second optical circulator (3), the second output coupler (9) and the polarization maintaining optical fiber (7) are sequentially connected with the first optical circulator (2); and forming a second resonant cavity with the polarization controller (4), the saturable absorber (5) and the pump driving module (1) so as to adjust the polarization controller (4) to change the coupling angle of the light pulse passing through the polarization maintaining optical fiber (7), and outputting a birefringent management soliton or a dissipative soliton through the second output coupler (9); wherein the net dispersion value of the second resonant cavity is positive.
2. The passive mode-locked fiber laser of polymorphic solitons according to claim 1, characterized in that said polarization controller (4) is adapted to vary the coupling angle of two orthogonal polarization components of an optical pulse passing through said polarization maintaining fiber (7) to output said birefringent managed solitons or said dissipative solitons;
Correspondingly, outputting the dissipative soliton when the coupling angle is 0 DEG or 90 DEG;
and outputting the birefringence management soliton when the coupling angle is any angle except 0 DEG and 90 deg.
3. The polymorphic soliton passive mode-locked fiber laser according to claim 1, characterized in that the pump drive module (1) comprises a first pump light source (10), a first wavelength division multiplexer (11), an erbium doped fiber (12), a second wavelength division multiplexer (13) and a second pump light source (14);
the first pumping light source (10) is connected with a first end of the first wavelength division multiplexer (11), and a second end of the first wavelength division multiplexer (11) is connected with the saturable absorber (5); the third end of the first wavelength division multiplexer (11) is connected with the first end of the erbium-doped fiber (12); a second end of the erbium-doped fiber (12) is connected with a third end of the second wavelength division multiplexer (13); the second end of the second wavelength division multiplexer (13) is connected with the second end of the second optical circulator (3), and the first end of the second wavelength division multiplexer (13) is connected with the second pumping light source (14).
4. The polymorphic soliton passive mode-locked fiber laser according to claim 1, characterized in that the pump drive module (1) comprises a pump light source, a wavelength division multiplexer and an erbium-doped fiber (12);
The pumping light source is connected with the first end of the wavelength division multiplexer; a second end of the wavelength division multiplexer is connected with the saturable absorber (5); a third end of the wavelength division multiplexer is connected with a first end of the erbium-doped fiber (12); a second end of the erbium doped fiber (12) is connected to a second end of the second optical circulator (3).
5. The polymorphic soliton, passive mode-locked fiber laser according to claim 3 or 4, characterized in that the first end of the second output coupler (9) is connected to the third end of the second optical circulator (3); the second end of the second output coupler (9) is connected with the polarization maintaining optical fiber (7); the third end of the second output coupler (9) is used for outputting a birefringence management soliton or a dissipative soliton.
6. A passive mode-locked fiber laser of polymorphic solitons according to claim 3 or4, characterized in that the number of polarization controllers (4) is one.
7. The polymorphic soliton passive mode-locked fiber laser according to claim 5, characterized in that the polarization maintaining fiber (7) has a length of 0.8m.
8. The polymorphic soliton passive mode-locked fiber laser according to claim 5, characterized in that the saturable absorber (5) is a graphene saturable absorber.
9. A passive mode-locked fiber laser of polymorphic solitons according to claim 3, characterized in that the working wavelength of said first pump light source (10) and said second pump light source (14) is 980nm or 1480nm.
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| CN109066278B (en) * | 2018-08-22 | 2019-09-06 | 华中科技大学 | The two-way polymorphic soliton fiber laser of mode locking |
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