CN102231475A - Method and device for acquiring stimulated Brillouin scattering light with high-fidelity pulse waveforms - Google Patents
Method and device for acquiring stimulated Brillouin scattering light with high-fidelity pulse waveforms Download PDFInfo
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Abstract
The invention discloses a method and a device for acquiring stimulated Brillouin scattering light with high-fidelity pulse waveforms, and belongs to the field of optics. The method and the device aim to solve the problems of low fidelity caused by the front edge steepening, pulse width narrowing and modulation of stimulated Brillouin scattering (SBS) pulse waveforms generated by a conventional Brillouin scattering light generation device and the structural complexity of a conventional improved device. In the method and the device, after P polarized pumped laser emitted by a laser is transmitted by a 1/2 wave plate, polarized pumped light with a P polarized component and an S polarized component is output; after the polarized pumped light of the P polarized component is transmitted sequentially by a polarizing film and a 1/4 wave plate, left circularly polarized pumped light is output and enters a liquid-core optical fiber by a coupling lens, and the stimulated Brillouin scattering light which is right circularly polarized light is output by the liquid-core optical fiber; and the right circularly polarized light is backtracked and completely converted into S polarized beams by the 1/4 wave plate.
Description
Technical field
The present invention relates to a kind of method and device that obtains stimulated Brillouin scattering light, belong to optical field with high fidelity (Hi-Fi) impulse waveform.
Background technology
Stimulated Brillouin scattering (SBS) is to produce phase-conjugation light method the most simply and easily, is with a wide range of applications at aspects such as improving laser beam quality, laser fusion and laser pulse compression.Yet, as the application of laser fusion and so on, both needed phase-conjugation light, require its impulse waveform identical again with the pump light waveform.Yet in existing SBS generation device, on the one hand, the threshold effect of SBS can change pulse front edge; On the other hand, the amplification of SBS to pumping pulse after along finding time, make whole pulse compression.Though along with the increase of pump energy, the SBS pulse duration can increase, pulse compression is alleviated to some extent, and too short or optical breakdown produces modulation phenomenon to the SBS impulse waveform that focus type liquid cell structure commonly used produces owing to medium phonon lifetime through regular meeting; Equally, solid dielectrics such as single mode or multimode silica fiber also modulation occurs owing to reasons such as phonon lifetime are short, and the waveform fidelity is very poor, and SBS impulse waveform forward position steepening in the existing SBS generation device, pulsewidth narrows down and it is poor to modulate the fidelity that causes.
Propose to utilize the seed field to induce single pond SBS structure to obtain Stokes amplification light pulse with pumping optical pulse waveform high-fidelity in " High pulse-shape fidelity realized in stimulated Brillouin scattering generator with Stokes seed injection " that " the seed field is to the influence of single cell stimulated Brillouin scattering impulse waveform fidelity " and 2005 " Chinese Physics " the 14th the 2nd phase of volume of delivering 2004 " Acta Physica Sinica " the 53rd the 2nd phase of volume delivers, obtained 90% impulse waveform fidelity.Yet as can be seen, experimental provision is quite complicated, needs 5 SBS liquid cells from paper, and its practicality is very limited.The core concept of this piece article is to produce in the pond at SBS to introduce seed light, induces down at it to produce SBS, thereby the SBS threshold value is reduced, and reduces the deformation of pulse front edge; Increase the SBS pulsewidth by increasing the seed light intensity, the two is in conjunction with improving SBS impulse waveform fidelity.
In sum, obtain fidelity SBS impulse waveform preferably, at first need choose reasonable Brillouin medium, will grow its phonon lifetime, brillouin gain wants high, avoids modulation phenomenon to take place; Secondly, design SBS generation device structure effectively reduces the SBS threshold value, and can avoid the optical breakdown phenomenon under the high pumping energy.
Summary of the invention
The present invention seeks to for solve SBS impulse waveform forward position steepening that existing Brillouin scattering light generating device produces, pulsewidth narrows down and modulate the baroque problem of the poor and existing modifying device of the fidelity that causes, a kind of method and device that obtains the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform is provided.
A kind of method of obtaining stimulated Brillouin scattering light of the present invention with high fidelity (Hi-Fi) impulse waveform, this method is: the P polarization state pumping laser that laser sends through 1/2 wave plate transmission after output have the polarized pump light of P polarization state component and S polarization state component, the polarized pump light of described P polarization state component is successively through output Left-hand circular polarization pump light after polarizer and the quarter wave plate transmission, described Left-hand circular polarization pump light enters in the liquid-core optical fibre through coupled lens, by liquid-core optical fibre output stimulated Brillouin scattering light;
The length of liquid-core optical fibre is chosen between 0.8m～2m, and internal diameter is chosen between 50 μ m～500 μ m, and the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre is chosen between 1.4～2, chooses phonon lifetime between 1.5ns～15ns;
The wave-length coverage of the P polarization state pumping laser that laser sends is between 300nm～10 μ m.
Realize the device of said method: comprise laser, 1/2 wave plate, polarizer, quarter wave plate, coupled lens and liquid-core optical fibre;
Set gradually 1/2 wave plate, polarizer, quarter wave plate and coupled lens on the optical axis of the P polarization state pumping laser that laser sends, the angle of 1/2 wave plate and described optical axis is θ, polarizer and described optical axis are Brewster's angle and place, quarter wave plate is vertical with described optical axis, and coupled lens is vertical with described optical axis;
The P polarization state pumping laser that laser sends is incident to 1/2 wave plate, the output of 1/2 wave plate has the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer, the polarized pump light of polarizer transmission P polarization state component, the polarized pump light of polarizer reflection S polarization state component, the polarized pump light that is polarized the P polarization state component of sheet transmission output is incident to quarter wave plate, quarter wave plate output Left-hand circular polarization pump light, described Left-hand circular polarization pump light is incident to coupled lens, Left-hand circular polarization pump light after the coupled lens output coupling enters in the liquid-core optical fibre, by liquid-core optical fibre output stimulated Brillouin scattering light.
Said apparatus may further include photodetector, the stimulated Brillouin scattering light of liquid-core optical fibre output is a right-circularly polarized light, described right-circularly polarized light returns along former road, after the coupled lens transmission, reenter and be incident upon quarter wave plate, quarter wave plate all converts the dextrorotation circularly polarized light of incident the light beam of S polarization state to, and exports photodetector to through the polarizer reflection, and photodetector is used for the SBS impulse waveform of detection system output.
Said apparatus can further include energy-probe, the P polarization state pumping laser that laser sends is incident to 1/2 wave plate, the output of 1/2 wave plate has the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer, the polarized pump light of the S polarization state component of polarizer reflection exports energy-probe to, and energy-probe is used for the pump energy of monitoring system input.
Advantage of the present invention: the present invention has advantages such as device is simple, method is easy, the applicable wavelengths scope wide, the SBS impulse waveform is controlled, be expected to become the substitute products of focusing liquid pool structure and optical fiber, have huge application potential in the various applications of stimulated Brillouin scattering.
Description of drawings
Fig. 1 is apparatus of the present invention structural representation;
Fig. 2 is that employing apparatus of the present invention generation pulsewidth is the pump light impulse waveform schematic diagram of 10ns;
Fig. 3 is that pulsewidth is the SBS optical pulse waveform schematic diagram of 7.1ns when adopting apparatus of the present invention generation pump energy to be 18 μ J;
Fig. 4 is the comparison diagram of pump light and SBS light when adopting apparatus of the present invention to produce pump energy to be 18 μ J;
Fig. 5 is that pulsewidth is the SBS optical pulse waveform schematic diagram of 9.7ns when adopting apparatus of the present invention generation pump energy to be 110 μ J;
Fig. 6 is the comparison diagram of pump light and SBS light when adopting apparatus of the present invention to produce pump energy to be 110 μ J.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described a kind of method of obtaining stimulated Brillouin scattering light of present embodiment with high fidelity (Hi-Fi) impulse waveform, this method is: the P polarization state pumping laser that laser 1 sends through 2 transmissions of 1/2 wave plate after output have the polarized pump light of P polarization state component and S polarization state component, the polarized pump light of described P polarization state component is successively through output Left-hand circular polarization pump light after polarizer 5 and quarter wave plate 6 transmissions, described Left-hand circular polarization pump light enters in the liquid-core optical fibre 8 through coupled lens 7, by liquid-core optical fibre 8 output stimulated Brillouin scattering lights;
The length of liquid-core optical fibre 8 is chosen between 0.8m～2m, and internal diameter is chosen between 50 μ m～500 μ m, and the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre 8 is chosen between 1.4～2, chooses phonon lifetime between 1.5ns～15ns;
The wave-length coverage of the P polarization state pumping laser that laser 1 sends is between 300nm～10 μ m, from the black light to the infrared light;
Change the energy of the pumping laser of incident by the anglec of rotation that changes 1/2 wave plate 2, and then obtain the stimulated Brillouin scattering light of different fidelitys.
Embodiment two: present embodiment is described below in conjunction with Fig. 1 to Fig. 6, present embodiment is for realizing execution mode one described a kind of device that obtains the method for the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform, it comprises laser 1,1/2 wave plate 2, polarizer 5, quarter wave plate 6, coupled lens 7 and liquid-core optical fibre 8
Set gradually 1/2 wave plate 2, polarizer 5, quarter wave plate 6 and coupled lens 7 on the optical axis of the P polarization state pumping laser that laser 1 sends, 1/2 wave plate 2 is θ with the angle of described optical axis, polarizer 5 is Brewster's angle with described optical axis and places, quarter wave plate 6 is vertical with described optical axis, coupled lens 7 is vertical with described optical axis
The P polarization state pumping laser that laser 1 sends is incident to 1/2 wave plate 2,2 outputs of 1/2 wave plate have the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer 5, the polarized pump light of polarizer 5 transmission P polarization state components, the polarized pump light of polarizer 5 reflection S polarization state components, the polarized pump light that is polarized the P polarization state component of sheet 5 transmissions output is incident to quarter wave plate 6, quarter wave plate 6 output Left-hand circular polarization pump lights, described Left-hand circular polarization pump light is incident to coupled lens 7, Left-hand circular polarization pump light after the coupled lens 7 output couplings enters in the liquid-core optical fibre 8, by liquid-core optical fibre 8 output stimulated Brillouin scattering lights.
By rotating 1/2 wave plate 2, the angle theta that changes 1/2 wave plate 2 and described optical axis changes the energy of the pumping laser of incident, and then obtains the stimulated Brillouin scattering light of different fidelitys.
The objective of the invention is for solve SBS impulse waveform forward position steepening in the existing SBS generation device, pulsewidth narrows down and modulate the baroque problem of poor and the existing modifying device of the fidelity that causes, thereby provide utilization to fill liquid-core optical fibre composition SBS generation device with high-gain high refractive index liquid medium.
Embodiment three: present embodiment is described further execution mode two, the described device that obtains the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform also comprises photodetector 3, the stimulated Brillouin scattering light of liquid-core optical fibre 8 outputs is a right-circularly polarized light, described right-circularly polarized light returns along former road, after coupled lens 7 transmissions, reenter and be incident upon quarter wave plate 6, quarter wave plate 6 all converts the dextrorotation circularly polarized light of incident to the light beam of S polarization state, and exporting photodetector 3 to through polarizer 5 reflection, photodetector 3 is used for the SBS impulse waveform of detection system output.
Embodiment four: present embodiment is described further execution mode two, the described device that obtains the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform also comprises energy-probe 4, the P polarization state pumping laser that laser 1 sends is incident to 1/2 wave plate 2,2 outputs of 1/2 wave plate have the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer 5, the polarized pump light of the S polarization state component of polarizer 5 reflections exports energy-probe 4 to, and energy-probe 4 is used for the pump energy of monitoring system input.
Embodiment five: present embodiment is described further execution mode two, and laser 1 is selected passive Q-adjusted single longitudinal mode list transverse mode Nd:YAG solid state laser, pulse duration 5ns～20ns, repetition rate 0.5Hz～3Hz, optical maser wavelength 300nm～10 μ m for use.
Embodiment six: present embodiment is described further execution mode two, and laser 1 is selected passive Q-adjusted single longitudinal mode list transverse mode Nd:YAG solid state laser, pulse duration 10ns, repetition rate 1Hz, optical maser wavelength 532nm for use.
Embodiment seven: present embodiment is described further execution mode two, and the focal length of coupled lens 7 is 3cm～10cm.
Embodiment eight: present embodiment is described further execution mode two, and the focal length of coupled lens 7 is 6cm.
Embodiment nine: present embodiment is described further execution mode two, liquid-core optical fibre 8 is selected elasticity vitreous silica liquid-core optical fibre for use, the length of liquid-core optical fibre 8 is between 0.8m～2m, internal diameter is between 50 μ m～500 μ m, the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre 8 is chosen between 1.4～2, and choose between 1.5ns～15ns phonon lifetime.
In all liquid mediums, CS
2Brillouin gain the highest, phonon lifetime is the longest, so the inertia of its sound field is also the longest, in SBS scattered light and the pump energy exchange process reaction of acoustic wavefield very slow, and then hinder relaxation oscillation, the SBS optical pulse waveform is not prone to modulation phenomenon.But, CS
2Breakdown threshold low, the optical breakdown phenomenon very easily takes place at the high pumping energy in common focusing structure.The present invention adopts is equipped with CS
2The structure of liquid-core optical fibre has the advantage of focusing liquid medium pond and silica fiber two aspects:
(1) the liquid-core optical fibre structure causes the SBS threshold value very low, can avoid SBS pulse front edge steepening;
(2) CS
2Phonon lifetime very long, be not prone to modulation phenomenon;
(3) the liquid-core optical fibre structure makes that the SBS action length is longer, also is difficult for taking place punch-through even pump energy reaches tens times of threshold values.
(4) the liquid-core optical fibre volume is little, flexible, is convenient to practical application.
Embodiment ten: present embodiment is described further execution mode two, liquid-core optical fibre 8 is selected elasticity vitreous silica liquid-core optical fibre for use, the length of liquid-core optical fibre 8 is 1m, internal diameter is 200 μ m, the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre 8 is 1.63, and be 1.6ns phonon lifetime.
Embodiment 11: present embodiment provides a specific embodiment, and the SBS generating means as shown in Figure 1.Solid ND:YAG passive Q-regulaitng laser output pulse width is the nearly Gaussian-shaped pulse of single longitudinal mode of 10ns, and repetition rate is 1Hz.Insert the 1.5mm aperture in the resonant cavity and be used for limiting the high-order transverse mode.Output wavelength is the 532nm pulse laser after the laser freuqency doubling.Laser 1 output P polarized pump laser pulse is after 2 transmissions of 1/2 wave plate, obtain having the polarized pump light of P component and S component, described polarized pump light is behind polarizer 5, reflection S polarised light, transmission P polarised light, the S polarised light of reflection enters pump energy probe 4, in order to the size of monitoring pump energy; The P polarised light of described transmission obtains the Left-hand circular polarization pump light after quarter wave plate 6 transmissions, described Left-hand circular polarization pump light is that the coupled lens 7 of 60mm enters in the liquid-core optical fibre 8 through focal length.Liquid-core optical fibre 8 length are 1m, and internal diameter is 200 μ m, and high brillouin gain is equipped with in liquid-core optical fibre 8 inside, brillouin gain g=68cm/GW; High index of refraction, refractive index n=1.63; Low absorption coefficient, absorption coefficient a=0.003cm
-1CS
2Liquid medium, this liquid-core optical fibre 8 have very big acceptance angle and numerical aperture (aperture is 0.68), and it is more convenient to be coupled and aligned.The attenuator that the pumping pulse laser energy is made up of rotatable 1/2 wave plate 2 and polarizer 5 carries out linear regulation, the SBS threshold value that surpasses liquid-core optical fibre 8 when the pumping pulse laser energy, the SBS effect takes place in liquid-core optical fibre 8 inner meetings, form the SBS light of back-propagating, after quarter wave plate 6 transmissions, obtain the S polarised light, be polarized sheet 5 reflections, enter photoelectric probe 3, the SBS optical pulse waveform that detects is by digital oscilloscope DPO4032 record.Change the SBS light pulse that pump energy can obtain different fidelitys, when pump energy is more than the 110 μ J, be SBS threshold value (7.5 μ J) more than 15 times the time, fidelity reaches more than 94% the SBS impulse waveform.
The attenuator linear regulation pump energy that utilizes rotatable 1/2 wave plate 2 and polarizer 5 to form has been measured the SBS impulse waveform under the different pump energies.As can be seen from Figure 4, tangible pulse compression and forward position steepening phenomenon appear in the SBS pulse under the low pump energy.Increase along with pump energy, SBS exponential gain (G=gIL, g is the brillouin gain coefficient, I is a pump intensity, and L is an action length) become big, cause the SBS pulse duration to broaden gradually, occur up to gain saturation, the SBS impulse waveform is constant substantially, and with pump light pulse basically identical, as shown in Figure 6.The waveform fidelity is defined as the energy ratio of normalized SBS light pulse of peak value and pump light pulse.SBS impulse waveform fidelity reached 94% when as calculated, pump energy was 110 μ J.Yet, common focus type CS
2Liquid cell SBS generation device can't obtain Hi-Fi impulse waveform, and this mainly is owing to when pump energy is higher, CS
2The optical breakdown phenomenon very easily takes place, and causes SBS pulse generation modulation phenomenon.And other liquid mediums commonly used, as heavy fluorocarbons (FC series), poly-perfluor ether compound (HT series) etc., though breakdown threshold is higher, phonon lifetime is shorter.Representing the inertia of sound field phonon lifetime, phonon lifetime is short more, and the inertia of sound field is more little, in SBS light and the pump energy exchange process reaction of acoustic wavefield just fast more, relaxation oscillation takes place easily, so the SBS pulse is prone to modulation phenomenon.At present, solid dielectric commonly used is a silica fiber, and its phonon lifetime is equally very short, and the modulation of SBS impulse waveform is serious.Though the method for some modulation that disappear occurs, install all more complicated.CS
2Liquid-core optical fibre had both had the advantage of its liquid medium, because action length is long, threshold value is lower, also was difficult for taking place punch-through even pump energy reaches tens times of threshold values again, therefore can obtain the very high impulse waveform of fidelity.
Claims (10)
1. method of obtaining stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, this method is: the P polarization state pumping laser that laser (1) sends through 1/2 wave plate (2) transmission after output have the polarized pump light of P polarization state component and S polarization state component, the polarized pump light of described P polarization state component is exported the Left-hand circular polarization pump light after passing through polarizer (5) and quarter wave plate (6) transmission successively, described Left-hand circular polarization pump light enters in the liquid-core optical fibre (8) through coupled lens (7), by liquid-core optical fibre (8) output stimulated Brillouin scattering light;
The length of liquid-core optical fibre (8) is chosen between 0.8m～2m, and internal diameter is chosen between 50 μ m～500 μ m, and the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre (8) is chosen between 1.4～2, chooses phonon lifetime between 1.5ns～15ns;
The wave-length coverage of the P polarization state pumping laser that laser (1) sends is between 300nm～10 μ m.
2. realize the described a kind of device that obtains the method for stimulated Brillouin scattering light of claim 1 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, it comprises laser (1), 1/2 wave plate (2), polarizer (5), quarter wave plate (6), coupled lens (7) and liquid-core optical fibre (8)
Set gradually 1/2 wave plate (2), polarizer (5), quarter wave plate (6) and coupled lens (7) on the optical axis of the P polarization state pumping laser that laser (1) sends, 1/2 wave plate (2) is θ with the angle of described optical axis, polarizer (5) is Brewster's angle with described optical axis and places, quarter wave plate (6) is vertical with described optical axis, coupled lens (7) is vertical with described optical axis
The P polarization state pumping laser that laser (1) sends is incident to 1/2 wave plate (2), 1/2 wave plate (2) output has the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer (5), the polarized pump light of polarizer (5) transmission P polarization state component, the polarized pump light of polarizer (5) reflection S polarization state component, the polarized pump light that is polarized the P polarization state component of sheet (5) transmission output is incident to quarter wave plate (6), quarter wave plate (6) output Left-hand circular polarization pump light, described Left-hand circular polarization pump light is incident to coupled lens (7), Left-hand circular polarization pump light after coupled lens (7) the output coupling enters in the liquid-core optical fibre (8), by liquid-core optical fibre (8) output stimulated Brillouin scattering light.
3. a kind of device that obtains stimulated Brillouin scattering light according to claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, it also comprises photodetector (3), the stimulated Brillouin scattering light of liquid-core optical fibre (8) output is a right-circularly polarized light, described right-circularly polarized light returns along former road, after coupled lens (7) transmission, reenter and be incident upon quarter wave plate (6), quarter wave plate (6) all converts the dextrorotation circularly polarized light of incident to the light beam of S polarization state, and exporting photodetector (3) to through polarizer (5) reflection, photodetector (3) is used for the SBS impulse waveform of detection system output.
4. a kind of device that obtains stimulated Brillouin scattering light according to claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, it also comprises energy-probe (4), the P polarization state pumping laser that laser (1) sends is incident to 1/2 wave plate (2), 1/2 wave plate (2) output has the polarized pump light of P polarization state component and S polarization state component, and be incident to polarizer (5), the polarized pump light of the S polarization state component of polarizer (5) reflection exports energy-probe (4) to, and energy-probe (4) is used for the pump energy of monitoring system input.
5. a kind of device that obtains stimulated Brillouin scattering light according to claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, laser (1) is selected passive Q-adjusted single longitudinal mode list transverse mode Nd:YAG solid state laser for use, pulse duration 5ns～20ns, repetition rate 0.5Hz～3Hz, optical maser wavelength 300nm～10 μ m.
6. a kind of device that obtains stimulated Brillouin scattering light according to claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that laser (1) is selected passive Q-adjusted single longitudinal mode list transverse mode Nd:YAG solid state laser, pulse duration 10ns for use, repetition rate 1Hz, optical maser wavelength 532nm.
7. a kind of device that obtains the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform according to claim 2 is characterized in that the focal length of coupled lens (7) is 3cm～10cm.
8. a kind of device that obtains the stimulated Brillouin scattering light with high fidelity (Hi-Fi) impulse waveform according to claim 2 is characterized in that the focal length of coupled lens (7) is 6cm.
9. realize the described a kind of device that obtains stimulated Brillouin scattering light of claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, liquid-core optical fibre (8) is selected elasticity vitreous silica liquid-core optical fibre for use, the length of liquid-core optical fibre (8) is between 0.8m～2m, internal diameter is between 50 μ m～500 μ m, the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre (8) is chosen between 1.4～2, and choose between 1.5ns～15ns phonon lifetime.
10. realize the described a kind of device that obtains stimulated Brillouin scattering light of claim 2 with high fidelity (Hi-Fi) impulse waveform, it is characterized in that, liquid-core optical fibre (8) is selected elasticity vitreous silica liquid-core optical fibre for use, the length of liquid-core optical fibre (8) is 1m, internal diameter is 200 μ m, the refractive index of the liquid Brillouin medium that be equipped with the inside of liquid-core optical fibre (8) is 1.63, and be 1.6ns phonon lifetime.
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| CN112952545A (en) * | 2019-12-11 | 2021-06-11 | 中国科学院大连化学物理研究所 | Phase conjugation laser amplifier based on hollow photonic crystal fiber |
| CN113764980A (en) * | 2021-09-15 | 2021-12-07 | 南京大学 | Self-pulse laser and pulse generation method |
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