CN114389138B - Pulse width compressor based on stimulated Raman scattering secondary amplification structure - Google Patents

Pulse width compressor based on stimulated Raman scattering secondary amplification structure Download PDF

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CN114389138B
CN114389138B CN202210034661.0A CN202210034661A CN114389138B CN 114389138 B CN114389138 B CN 114389138B CN 202210034661 A CN202210034661 A CN 202210034661A CN 114389138 B CN114389138 B CN 114389138B
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srs
light
dichroic mirror
pulse width
pool
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CN114389138A (en
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刘照虹
李绍文
罗甜甜
樊榕
纪文强
宋雷雷
王雨雷
吕志伟
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Hebei University of Technology
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Hebei University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/305—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in a gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01S3/10—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/307—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in a liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention relates to a pulse width compressor based on a stimulated Raman scattering secondary amplifying structure, which is characterized by comprising the following components: the system comprises a pumping source, a beam splitter, a first reflecting mirror, a convex lens, an SRS generating pool and an SRS secondary amplifying system; the SRS secondary amplification system includes a first dichroic mirror, a first SRS amplification cell, a second dichroic mirror, a second reflecting mirror, a third reflecting mirror, a second SRS amplification cell, and a third dichroic mirror. The pump light is compressed and amplified based on the stimulated Raman scattering secondary amplifying structure, so that higher energy output can be obtained, and compared with a mode-locked laser, the pump light can directly generate picosecond laser with tens of millijoules. The SRS pulse width compression technology is utilized to compress the pump light, and the Raman active medium has the characteristic of short phonon service life, so that short pulse laser can be generated.

Description

Pulse width compressor based on stimulated Raman scattering secondary amplification structure
Technical Field
The invention relates to the field of short pulse lasers, in particular to a pulse width compressor based on a stimulated Raman scattering secondary amplifying structure.
Background
The ultra-short pulse laser has wide application in various fields, can greatly improve the accuracy of laser ranging, provides more effective and safer light sources for medical instruments, and the like, and plays a vital role in the related fields. The current method for widely generating the ultra-short pulse laser comprises a Q-switching technology, a mode locking technology and a stimulated scattering technology, wherein the Q-switching technology can only generate nanosecond or subnanosecond laser pulses; the pulse laser energy generated by the mode locking technology is only of micro-focal magnitude and has a complex structure; stimulated brillouin scattering (Stimulated Brillouin Scattering, SBS) pulse width compression techniques can produce hundred picosecond laser pulses, but are limited by nonlinear effects such as optical breakdown, and cannot reach theoretical compression limits.
Stimulated raman scattering (Stimulated Raman Scattering, SRS) is generally used for wavelength conversion, and because SRS is generally single cell focused, the energy conversion efficiency is low and uncontrollable, the experimental effect is not ideal, and the stimulated raman scattering is rarely used for pulse width compression. The invention provides a pulse width compressor based on a stimulated Raman scattering secondary amplifying structure, which adopts the secondary amplifying structure, can improve the energy conversion efficiency while having the ultra-short pulse laser output, has a shorter compression limit due to the characteristic of low phonon life of a Raman active medium, can effectively obtain the ultra-short pulse laser of picosecond level by utilizing the SRS pulse width compression technology, and has very important practical value and significance.
Disclosure of Invention
The invention aims to provide a pulse width compressor based on a stimulated Raman scattering secondary amplification structure, which realizes high-efficiency Raman compression and amplification through secondary amplification to generate high-energy ultrashort pulse laser and solves the problem of low energy conversion efficiency of the traditional SRS pulse width compression structure.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a pulse width compressor based on a stimulated raman scattering secondary amplification structure, the pulse width compressor comprising: the system comprises a pump source 1, a beam splitter 2, a first reflecting mirror 3, a convex lens 4, an SRS generating pool 5 and an SRS secondary amplifying system 6.
Wherein the SRS secondary amplification system 6 comprises a first dichroic mirror 6-1, a first SRS amplification tank 6-2, a second dichroic mirror 6-3, a second reflecting mirror 6-4, a third reflecting mirror 6-5, a second SRS amplification tank 6-6 and a third dichroic mirror 6-7;
the pump source 1 emits pump light, the pump light is divided into two beams by the beam splitter 2, the first beam is focused and reflected by the convex lens 4 and the first dichroic mirror 6-1 in the SRS secondary amplifying system 6 to enter the SRS generating pool 5 to generate Stokes seed light back to the SRS, and the Stokes seed light returns to enter the first SRS amplifying pool 6-2 through the first dichroic mirror 6-1 in a primary path; the second beam of light is reflected by the first reflecting mirror 3 and the second dichroic mirror 6-3 to meet the Stokes seed light in a direction opposite to the Stokes seed light for first amplifying and compressing; the unconsumed pump light is reflected by the first dichroic mirror 6-1 and the third dichroic mirror 6-7 to enter the second SRS amplifying tank 6-6, the Stokes seed light after the first amplifying compression is transmitted by the second dichroic mirror 6-3, the second reflecting mirror 6-4 and the third reflecting mirror 6-5 are reflected to enter the second SRS amplifying tank 6-6 to meet the unconsumed pump light oppositely and are amplified and compressed for the second time, and the ultra-short Stokes seed light after the second amplifying compression is output through the third dichroic mirror 6-7.
The first dichroic mirror 6-1, the second dichroic mirror 6-3 and the third dichroic mirror 6-7 are all highly transmissive to Stokes seed light and highly reflective to pump light.
Wherein the medium in the SRS generating pool 5, the first SRS amplifying pool 6-2 and the second SRS amplifying pool 6-6 is Ba (NO) 3 ) 2 、CS 2 、H 2 Toluene, liquid oxygen and H 2 O and the like.
The technical scheme provided by the invention has the beneficial effects that:
1. according to the pulse width compressor based on the stimulated Raman scattering secondary amplifying structure, pumping light is compressed and amplified based on the stimulated Raman scattering secondary amplifying structure, high energy output can be obtained, and compared with a mode-locked laser, picosecond laser with dozens of millijoules can be directly generated. The SRS pulse width compression technology is utilized to compress the pump light, and the Raman active medium has the characteristic of short phonon service life, so that short pulse laser can be generated.
2. According to the pulse width compressor provided by the invention, due to the SRS secondary amplification system, the interaction time of the pump light and the Stokes light is prolonged, so that the waste of pump light energy can be avoided, the energy conversion efficiency is effectively increased, and the efficient pulse width compression is realized.
3. According to the pulse width compression and SRS secondary amplification system provided by the invention, the pumping light and Stokes light are transmitted in opposite directions, the third reflector 6-5, the second SRS amplification pool 6-6 and the third dichroic mirror 6-7 are added, and the rest pumping light and Stokes seed light can be extracted and compressed again, so that the input efficiency is higher, the energy conversion efficiency is higher, and the amplification and compression of the seed light are more facilitated.
4. The pulse width compressor provided by the invention only uses one light source, the two light beams are divided into two light beams by the beam splitter, the two light beams have different energy, then a three-pool structure is adopted (only the first-order seed light is amplified, the generation pool is backward Raman scattering), the SRS generation pool and the SRS amplification pool have wider gain bandwidth and shorter phonon service life, can generate subnanosecond, picosecond and even subpicosecond pulse lasers, are far lower than the compression limit of the Q-switching technology, solve the problems of low energy conversion efficiency and non-ideal experimental effect caused by the fact that the stimulated Raman scattering is subjected to high-order Stokes, forward and backward scattering, realize the aim of pulse width compression by utilizing the stimulated Raman scattering, can meet the experimental effect, have narrower pulse width compared with the SBS pulse width compression technology, have high efficiency, can change the meeting condition of the output waveform and the pulse width of the second light beam by controlling the positions of the amplification pool, and can realize the best condition that the Stokes light meets the second light beam width, can realize the special condition that the meeting condition of the first amplifying pool, the second amplifying pool has better meeting condition, the pulse width can be controlled according to the special condition, the meeting condition that the two pulse width can be better, the meeting condition can be controlled, the special condition can be changed, the special condition can be realized, the special condition can be changed, the meeting the waveform is required to be changed, and the special condition is better, the needs can be changed, and the waveform is required to be better when the front and the two amplifying pool is required to be subjected to the special, and has the special conditions can be changed. The invention can directly generate picosecond laser with ten millijoules, and compared with the traditional pulse width compression conversion efficiency (lower than 10 percent), the invention can improve to more than 15 percent, and the efficiency of the traditional Q-switched laser is 1 percent at most, so the application effect is remarkable.
5. The pulse width compressor provided by the invention has larger wavelength frequency shift (different medium frequency shifts or changes input wavelength and output wavelength) based on stimulated Raman scattering effect, and can generate special wavelength which is difficult to generate by other lasers while performing pulse width compression, and output the special wavelength as a single longitudinal mode, namely only outputting pulse with one wavelength.
Drawings
Fig. 1 is a schematic diagram of a pulse width compressor based on a stimulated raman scattering secondary amplification structure.
Fig. 2 is a graph of output pulse width results according to a first embodiment of the present invention.
FIG. 3 is a graph showing the simulation of the numerical results of the output pulse width at different pump source pulse widths according to the present invention.
Fig. 4 is a graph showing the output pulse width result according to the third embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1: a pump source; 2: a beam splitter;
3: a first mirror; 4: a convex lens;
5, a step of; an SRS generation pool; 6: an SRS secondary amplification system;
6-1: a first dichroic mirror; 6-2: a first SRS amplification pool;
6-3: a second dichroic mirror; 6-4: a second mirror;
6-5: a third mirror; 6-6: a second SRS amplification pool:
6-7: and a third dichroic mirror.
Detailed Description
The present invention is further explained below with reference to examples and drawings, but is not to be construed as limiting the scope of the present application.
The invention provides a pulse width compressor based on a stimulated Raman scattering secondary amplifying structure, which enables the pumping light which is not exhausted after the primary amplifying and Stokes seed light to be subjected to twice compatible amplifying so as to improve the energy conversion rate and realize more efficient pulse width compression.
Referring to fig. 1, a pulse width compressor based on a stimulated raman scattering secondary amplifying structure includes: the system comprises a pump source 1, a beam splitter 2, a first reflecting mirror 3, a convex lens 4, an SRS generating pool 5 and an SRS secondary amplifying system 6.
The SRS secondary amplification system 6 consists of a first dichroic mirror 6-1, a first SRS amplification pool 6-2, a second dichroic mirror 6-3, a second reflecting mirror 6-4, a third reflecting mirror 6-5, a second SRS amplification pool 6-6 and a third dichroic mirror 6-7.
Further, the pump source 1 emits pump light, the pump light is divided into two beams by the beam splitter 2, the first beam of light is focused and reflected by the convex lens 4 and the first dichroic mirror 6-1 in the SRS secondary amplifying system 6 to enter the SRS generating pool 5 to generate Stokes seed light back to the SRS, and the Stokes seed light returns to enter the first SRS amplifying pool 6-2 through the first dichroic mirror 6-1 in a primary path; the second beam of light is reflected by the first reflecting mirror 3 and the second dichroic mirror 6-3 to meet the Stokes seed light in a direction opposite to the Stokes seed light for first amplifying and compressing; the unconsumed pump light is reflected by the first dichroic mirror 6-1 and the third dichroic mirror 6-7 to enter the second SRS amplifying tank 6-6, the Stokes seed light after the first amplifying compression is transmitted by the second dichroic mirror 6-3, the second reflecting mirror 6-4 and the third reflecting mirror 6-5 are reflected to enter the second SRS amplifying tank 6-6 to meet the unconsumed pump light oppositely and are amplified and compressed for the second time, and the ultra-short Stokes seed light after the second amplifying compression is output through the third dichroic mirror 6-7.
The dichroic mirror is characterized in that: the first dichroic mirror 6-1 has a reflection effect on a certain wavelength and a transmission effect on another wavelength, so that the focused pump light is high-reflection, the focused pump light enters the SRS generating tank 5 to generate seed light by back Raman scattering, the first dichroic mirror 6-1 is high-transmission to the seed light, the seed light can directly enter the first SRS amplifying tank 6-2 to meet the pump source 1, the pump source which comes out of the first SRS amplifying tank 6-2 after meeting is not exhausted, the pump light is high-reflection acted on the third dichroic mirror through the first dichroic mirror 6-1, the non-exhausted pump light is high-reflection acted on the third dichroic mirror to enter the second SRS amplifying tank 6-6, the seed light is high-transmission through the second dichroic mirror to the second SRS amplifying tank 6-6 after being amplified and compressed for the first time, the seed light meets the non-exhausted pump light in the second SRS amplifying tank 6-6, and the seed light is high-transmission through the third dichroic mirror 6-7 after being compressed again.
The SRS generating cell 5 generates Stokes seed light with low light energy and wide pulse width, the Stokes seed light enters the SRS secondary amplifying system 6, and the two amplifying cells are amplified by pump light, i.e. meet the other part of split light, and the energy is extracted and the pulse width is compressed.
In the raman generation process, high-order Stokes are generated, the first-order Stokes light is amplified, the high-order Stokes cannot enter the first SRS amplifying tank 6-2 through the first dichroic mirror 6-1, the influence of the high-order Stokes on amplification and compression can be effectively prevented, and the Stokes light generated back to the raman is opposite to the pumping light, so that the Stokes light is transmitted back to the raman in the SRS generating tank 5 and is opposite to the pumping light in transmission direction. The Stokes light in the SRS generating pool 5 is firstly subjected to primary compression with the opposite direction of the pump light, the precompression effect is reflected, meanwhile, the reverse Stokes seed light after passing through the first dichroic mirror 6-1 is subjected to secondary compression and the energy of the second beam light is extracted for amplification, the unconsumed pump light is subjected to secondary amplification and compression again through the second SRS amplifying pool 6-6, the tertiary compression effect is realized, and the compression efficiency is higher. Therefore, the SRS pulse width compression of the invention has wider gain bandwidth and shorter compression limit, and is more likely to realize the acquisition of picosecond pulses.
Wherein, the focus of the convex lens 4 is at the center of the SRS generating pool 5.
Further, the first dichroic mirror 6-1, the second dichroic mirror 6-3 and the third dichroic mirror 6-7 are all highly transmissive to the first order Stokes seed light and highly reflective to the pump light. The first dichroic mirror and the second dichroic mirror are arranged in parallel at equal height, both are inclined by 45 degrees, the third dichroic mirror 6-7 is positioned below the first dichroic mirror 6-1, and the included angle between the first dichroic mirror and the second dichroic mirror is 90 degrees.
The SRS generation tank 5, the first SRS amplification tank 6-2 and the second SRS amplification tank 6-6 are all Raman active mediums such as Ba (NO) 3 ) 2 、CS 2 、H 2 Toluene, liquid oxygen and H 2 O and other solid, gas and liquid Raman active media, and the optical phonon lifetime is in the picosecond order. The single longitudinal mode laser selected by the pump source 1 has the wavelength between 200nm and 1500nm, the focal length range of the convex lens 4 is 10cm to 70cm, SThe length of the RS generating pool 5 is 0.5 cm-120 cm, and the lengths of the two SRS amplifying pools are 0.5 cm-150 cm.
Furthermore, the present application incorporates a measurement system between the first dichroic mirror 6-1 and the SRS generating cell 5; the measuring system consists of a wedge-shaped plate, a first energy meter, a first photoelectric detector, a second energy meter and a second photoelectric detector; the measuring system can measure the energy and time domain waveforms of the pump light and the Stokes seed light generated by the SRS generation tank 5; the wedge-shaped plate is an optical plate with two surfaces forming a certain included angle, and when light passes through the wedge-shaped plate, two beams of reflected light with energy which is 4% of the energy of the incident light are reflected; the pump light is reflected by the wedge plate and enters the first energy meter and the first photoelectric detector; the Stokes seed light is reflected into the second energy meter and the second photodetector as it passes through the wedge plate.
The beam splitting condition of the beam splitter 2 can be selected according to the following method: the beam splitter 2 is placed at an angle of 45 degrees, and the beam is split into two beams with different energy ratios by changing different beam splitters 2, so that the peak power of Stokes light generated by the SRS generating pool 5 is equivalent to that of the second beam; the finally output Stokes seed light has relatively high energy conversion efficiency. The peak power is obtained by the corresponding energy meter and photodetector.
The wavelength of the single longitudinal mode laser selected by the pump source 1 is between 200nm and 1500nm, the pulse width is between 0.1ns and 10ns, and the light path f' from the focus incidence position to the focus position of the SRS generating pool 5 is half of the light length corresponding to the pulse width, which can be expressed as:where c is the speed of light in vacuum, τ p For the pulse width of the pump source 1, n is the refractive index of the medium in the SRS generation cell 5. The focal point is the focal point formed by the convex lens 4 in the SRS generating cell 5, and the focal point incidence point is the right boundary of the SRS generating cell 5, and light enters the SRS generating cell 5 from the right boundary of the SRS generating cell 5.
The focal length f=d+f', d of the convex lens 4 is the distance from the center point of the convex lens 4 to the point where SRS is incident to the pool focal point, i.e. the pool mirror pitch.
In order to ensure that the focal point of the convex lens 4 is in the pool, the pool lengths of the SRS generating pool 5 and the two SRS amplifying pools need to satisfy: l > f'.
Let η be the energy conversion efficiency, which can be expressed as:E p for pumping light energy, i.e. output of pump source 1, E s Which is the Stokes light energy that is ultimately output by the second dichroic mirror 8.
The focal point is the focal point formed by the convex lens 4 in the SRS generating cell 5, and the focal point incidence point is the right boundary of the SRS generating cell 5, and light enters the SRS generating cell 5 from the right boundary of the SRS generating cell 5.
Embodiment one: this example is identical in structure to the above embodiment and has the following parameters:
the wavelength output by the pump source 1 is 1064nm, the pulse width is 1ns, the divergence angle is 0.45mrad, the peak power is 1.5MW, and the pulse width is 1ns; the medium in the SRS generating pool 5, the first SRS amplifying pool 6-2 and the second SRS amplifying pool 6-6 is Ba (NO) 3 ) 2 The crystal (1064 nm Raman gain coefficient is 11cm/GW, phonon life is 80 ps), and the pool length of the SRS generation pool 5, the first SRS amplifying pool 6-2 and the second SRS amplifying pool 6-6 is 100mm; the distance between the convex lens 4 and the SRS generating pool 5 is 25cm, the focal length of the convex lens 4 is 31cm, and other device models are not limited. Considering the loss and the influence of the higher-order Stokes, the actual energy conversion efficiency is about 20%, and under the same condition, the final output energy of adding the second SRS amplifying pond is higher than that of setting only one SRS amplifying pond.
As can be seen from fig. 2, the output pulse width is 65.5ps, with significant compression compared to the 1ns pulse width of the input light.
Embodiment two: in this embodiment, the pulse width of the pump source 1 is changed, and the remaining parameters are the same as those of the first embodiment, and the numerical result simulation is shown in fig. 3. The effect of different pump source pulse widths on the output light pulse width and waveform.
Embodiment III: in this embodiment, the output wavelength of the pump source 1 is 532nm, the peak power is 20MW, the pulse width is 700ps, the divergence angle is 0.45mrad, deionized water (532 nm raman gain coefficient is 0.1cm/GW, phonon lifetime is 1.9 ps) is used as the raman medium, the cell lengths of the SRS generating cell 5, the first SRS amplifying cell 6-2 and the second SRS amplifying cell 6-6 are all 100mm, the distance between the convex lens 4 and the SRS generating cell 5 is 10cm, the focal length of the convex lens 4 is 14cm, other parameters and the device model are the same as those of the first embodiment, and the numerical simulation results of this embodiment are shown in fig. 4.
Comparative example one and example three, the raman-active medium was selected from Ba (NO 3 ) 2 The laser output of 93.8ps is finally output after the deionized water is changed.
According to the invention, the opposite meeting time can be regulated by controlling the position of the SRS amplifying pool, the efficiency is improved, less light enters the SRS generating pool 5 by beam splitting of the beam splitting mirror, almost 10% of the light enters the SRS generating pool, the pumping light energy of the second beam of light going to the reflecting mirror 3 is larger, and when the opposite Stokes seed light passing through the first dichroic mirror meets the second beam of light in opposite directions, the energy which can be extracted is larger, so that the rising of the front edge is faster; the output reaches the compression effect of picosecond, picosecond and tens of picosecond by the generation and amplification structure (SRS generation pool 5 and SRS amplification pool), and the input pulse width is correspondingly adjusted according to the pool length.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and modifications, equivalent substitutions and the like are within the spirit and principle of the present invention.
The invention is applicable to the prior art where it is not described.

Claims (10)

1. A pulse width compressor based on stimulated raman scattering secondary amplification structure, the pulse width compressor comprising: the system comprises a pumping source, a beam splitter, a first reflecting mirror, a convex lens, an SRS generating pool and an SRS secondary amplifying system;
the SRS secondary amplification system comprises a first dichroic mirror, a first SRS amplification pool, a second dichroic mirror, a second reflecting mirror, a third reflecting mirror, a second SRS amplification pool and a third dichroic mirror;
the pumping source emits pumping light, the pumping light is divided into two beams of light by a beam splitter, the first beam of light is focused and reflected by a convex lens and a first dichroic mirror in the SRS secondary amplifying system and enters an SRS generating pool to generate Stokes seed light back to the SRS, and the Stokes seed light returns to enter the first SRS amplifying pool through the first dichroic mirror in a primary path; the second beam of light is reflected by the first reflecting mirror and the second dichroic mirror to meet the Stokes seed light in opposite directions for first amplification and compression; the unconsumed pump light is reflected by the first dichroic mirror and the third dichroic mirror to enter the second SRS amplifying pool, the Stokes seed light after the first amplification compression is transmitted by the second dichroic mirror, and the second reflecting mirror and the third reflecting mirror are reflected to enter the second SRS amplifying pool to meet the unconsumed pump light oppositely and are amplified and compressed for the second time, and the ultrashort Stokes seed light after the second amplification compression is output through the third dichroic mirror.
2. The pulse width compressor based on stimulated raman scattering secondary amplification structure of claim 1, wherein the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror are each highly transmissive to Stokes seed light and highly reflective to pump light.
3. The pulse width compressor based on stimulated raman scattering secondary amplification structure of claim 1, wherein the medium in the cells of the SRS generating cell, the first SRS amplifying cell and the second SRS amplifying cell is Ba (NO 3 ) 2 、CS 2 、H 2 Toluene, liquid oxygen and H 2 At least one raman-active medium in O.
4. The pulse width compressor based on the stimulated raman scattering secondary amplification structure of claim 1, wherein the focal point of the convex lens is at the center of the SRS generating pool; the first dichroic mirror and the second dichroic mirror are arranged in parallel at equal height, are both inclined by 45 degrees, and the third dichroic mirror is positioned below the first dichroic mirror, and the included angle between the first dichroic mirror and the second dichroic mirror is 90 degrees.
5. The pulse width compressor based on stimulated raman scattering secondary amplification structure of claim 1, wherein the pump source selects a single longitudinal mode laser with a wavelength of 200 nm-1500 nm, the focal length of the convex lens ranges from 10cm to 70cm, the SRS generating pool length ranges from 0.5cm to 120cm, and the two SRS amplifying pools are 0.5cm to 150cm.
6. The pulse width compressor based on the stimulated raman scattering secondary amplification structure of claim 1, wherein a measurement system is added between the first dichroic mirror and the SRS generating cell; the measuring system consists of a wedge-shaped plate, a first energy meter, a first photoelectric detector, a second energy meter and a second photoelectric detector; the measuring system is used for measuring the energy and time domain waveforms of the pump light and Stokes seed light generated by the SRS generation pool; the wedge-shaped plate is an optical plate with two surfaces forming a certain included angle, and when light passes through the wedge-shaped plate, two beams of reflected light with energy which is 4% of the energy of the incident light are reflected; the pump light is reflected by the wedge plate and enters the first energy meter and the first photoelectric detector; the Stokes seed light is reflected into the second energy meter and the second photodetector as it passes through the wedge plate.
7. The pulse width compressor based on the stimulated raman scattering secondary amplification structure of claim 6, wherein the beam splitting condition of the beam splitter is selected according to the following method: the beam splitter is placed at an angle of 45 degrees, and the beam is split into two beams with different energy ratios by changing different beam splitters, so that the peak power of Stokes light generated by the SRS generating pool is equivalent to that of the second beam; the Stokes seed light finally output at the moment has relatively high energy conversion efficiency; the peak power is obtained by the corresponding energy meter and photodetector.
8. The pulse width compressor based on stimulated Raman scattering secondary amplification structure of claim 1, wherein the wavelength of the single longitudinal mode laser selected by the pumping source is between 200nm and 1500nm, the pulse width is between 0.1ns and 10ns,where c is the speed of light in vacuum, τ p Pulse width of pumping source, n isRefractive index of medium in SRS generation pool;
the focal length f=d+f', d of the convex lens is the distance from the center point of the convex lens to the incidence position of the focus of the SRS generating pool, namely Chi Jing pitch;
the pool length L of the SRS generation pool and the pool length L of the two SRS amplifying pools are required to satisfy the following conditions: l > f'.
9. The pulse width compressor based on the stimulated Raman scattering secondary amplifying structure according to claim 1, wherein the pulse width compressor amplifies first-order Stokes light, the high-order Stokes cannot enter two SRS amplifying tanks through the first dichroic mirror, the effect of the high-order Stokes on amplifying compression is effectively prevented, and the dichroic mirror is utilized for reflection and filtering; the back transmission of the back Raman Stokes light in the SRS generating pool is opposite to the transmission direction of the pumping light, the Stokes light in the SRS generating pool is firstly subjected to primary compression by meeting the pumping light in the opposite direction, meanwhile, the back Stokes seed light after passing through the first dichroic mirror is subjected to secondary compression by meeting the second beam light in the opposite direction, the energy of the second beam light is extracted for amplification, the unconsumed pumping light is subjected to secondary amplification and compression by passing through the second SRS amplifying pool, the effect of tertiary compression is realized, and the ultra-short pulse is output.
10. The pulse width compressor based on the stimulated raman scattering secondary amplification structure of claim 1, wherein the positions of the two SRS amplification pools are controlled so as to change the meeting condition of Stokes light and the second beam light, and further change the output waveform and pulse width; the front edge is controlled to be amplified and the rear edge is controlled not to be amplified, so that special needed waveforms can be generated; since Stokes light is amplified in the SRS generating cells, longer and wider waveforms can be generated by changing the lengths of the two SRS amplifying cells.
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