CN114389138A - 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 PDFInfo
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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
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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
- H01S3/10—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
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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
- H01S3/10—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
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- H—ELECTRICITY
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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
- H01S3/23—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
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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
- H01S3/307—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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to a pulse width compressor based on a stimulated Raman scattering secondary amplification structure, which is characterized by comprising the following components: the SRS scanning device comprises a pumping source, a beam splitter, a first reflector, a convex lens, an SRS generating pool and an SRS secondary amplification 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 light is compressed and amplified based on the stimulated Raman scattering secondary amplification structure, higher energy output can be obtained, and compared with a mode-locked laser, the pump can directly generate picosecond laser with dozens 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
Technical Field
The invention relates to the field of short pulse laser, in particular to a pulse width compressor based on a stimulated Raman scattering secondary amplification structure.
Background
Ultrashort pulse laser has wide application in many fields, can greatly improve the precision of laser ranging, provides more effective and safer light sources for medical instruments and the like, and plays a vital role in related fields. The existing method for widely generating ultrashort 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 pulse; the pulse laser energy generated by the mode locking technology is only in micro-focus level and has a complex structure; the SBS (Stimulated Brillouin Scattering) pulse width compression technique can generate a hundred-picosecond laser pulse, but is limited by the generation of nonlinear effects such as optical breakdown, and cannot reach the theoretical compression limit.
Stimulated Raman Scattering (SRS) is generally used for wavelength conversion, and since SRS is generally single-cell focused, energy conversion efficiency is low and uncontrollable, experimental effect is not ideal, and SRS is rarely used for pulse width compression. The invention provides a pulse width compressor based on a stimulated Raman scattering secondary amplification structure, which adopts the secondary amplification structure, can improve the energy conversion efficiency while outputting ultrashort pulse laser, has shorter compression limit due to the characteristic that a Raman active medium has low phonon service life, can effectively obtain picosecond-level ultrashort pulse laser by utilizing an 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 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 SRS scanning device comprises a pumping source 1, a beam splitter 2, a first reflector 3, a convex lens 4, an SRS generating pool 5 and an SRS secondary amplification system 6.
The SRS secondary amplification system 6 comprises 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;
the pump source 1 emits pump light, the pump light is divided into two beams of light through the beam splitter 2, the first beam of light is focused and reflected by the convex lens 4 and a first dichroic mirror 6-1 in the SRS secondary amplification system 6, enters the SRS generation pool 5, generates backward SRS to generate Stokes seed light, and the original path of the Stokes seed light returns to pass through the first dichroic mirror 6-1 and enters the first SRS amplification pool 6-2; the second beam of light is reflected by the first reflecting mirror 3 and the second dichroic mirror 6-3 to encounter the Stokes seed light oppositely for the first amplification and compression; the unconsumed pumping light is reflected by the first dichroic mirror 6-1 and the third dichroic mirror 6-7 to enter the second SRS amplification pool 6-6, the Stokes seed light after the first amplification and compression passes through the second dichroic mirror 6-3 and is transmitted, the second reflecting mirror 6-4 and the third reflecting mirror 6-5 are reflected to enter the second SRS amplification pool 6-6 to meet the unconsumed pumping light in an opposite direction and perform the second amplification and compression, and the ultrashort Stokes seed light after the second amplification and compression passes through the third dichroic mirror 6-7 to be output.
The first dichroic mirror 6-1, the second dichroic mirror 6-3 and the third dichroic mirror 6-7 are highly transmissive to the Stokes seed light and highly reflective to the pump light.
Wherein, the medium in the SRS generating pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 is Ba (NO)3)2、CS2、H2Toluene, liquid oxygen and H2O, 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 amplification structure, the pump light is compressed and amplified based on the stimulated Raman scattering secondary amplification structure, higher energy output can be obtained, and compared with a mode-locked laser, the pulse width compressor can directly generate picosecond laser with dozens of milli-joules. 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, the waste of the energy of the pump light can be avoided, the energy conversion efficiency is effectively increased, and the high-efficiency 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 the Stokes light are transmitted in the opposite direction, the third reflector 6-5, the second SRS amplification pool 6-6 and the third dichroic mirror 6-7 are added, and the residual pumping light and the 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 beams of light are divided into two beams by the beam splitter, the two beams of light have different energy, and then a three-pool structure (only one-order seed light is amplified, and a generation pool is backward Raman scattering) is adopted, Raman active media in an SRS generation pool and an SRS amplification pool have wider gain bandwidth and shorter phonon service life, and can generate subnanosecond, picosecond and even subpicosecond pulse laser which is far lower than the compression limit of a Q modulation technology The Stokes light and the pumping light of the second light meet at the centers of the first amplification pool and the second amplification pool (the efficiency is high, the compression effect is good, the waveform is good, and the pulse width is narrow), and the change of the meeting position can help some situations that special waveforms need to be generated (for example, the front edge is controlled not to be amplified and then generates special needed waveforms, and the lengths of the two amplification pools are changed relative to the single pool, so that longer and wider waveforms can be generated), and the adjustment can be carried out according to actual needs. The invention can directly generate picosecond laser with dozens of millijoules, and compared with the traditional pulse width compression conversion efficiency (lower than 10 percent), the conversion efficiency can be improved to more than 15 percent, and the maximum efficiency of the traditional Q-switched laser is 1 percent, so the effect of the invention is obvious.
5. The pulse width compressor provided by the invention has the advantages that the wavelength frequency shift is large (different medium frequency shifts are different or the input wavelength is changed to change the output wavelength) based on the stimulated Raman scattering effect, special wavelengths which are difficult to generate by other lasers can be generated while the pulse width compression is carried out, and the special wavelengths are output as a single longitudinal mode, namely, only pulses with one wavelength are output.
Drawings
Fig. 1 is a schematic structural diagram of a pulse width compressor based on a stimulated raman scattering secondary amplification structure.
Fig. 2 is a graph showing the result of the output pulse width according to the first embodiment of the present invention.
FIG. 3 is a graph of a simulation of the results of the output pulse width for different pump pulse widths.
Fig. 4 is a graph showing the result of the output pulse width according to the third embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1: a pump source; 2: a beam splitter;
3: a first reflector; 4: a convex lens;
5; 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 reflector;
6-5: a third reflector; 6-6: a second SRS amplification pool:
6-7: a third dichroic mirror.
Detailed Description
The present invention is further explained with reference to the following examples and drawings, but the scope of the present invention is not limited thereto.
The invention provides a pulse width compressor based on a stimulated Raman scattering secondary amplification structure, which enables pump light which is not exhausted after first amplification and Stokes seed light to be subjected to two times of encountering amplification 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 amplification structure includes: the SRS scanning device comprises a pumping source 1, a beam splitter 2, a first reflector 3, a convex lens 4, an SRS generating pool 5 and an SRS secondary amplification system 6.
The SRS secondary amplification system 6 is composed 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 light emitted by the pump source 1 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 amplification system 6, enters the SRS generation pool 5, generates backward SRS to generate Stokes seed light, and the original path of the Stokes seed light returns to pass through the first dichroic mirror 6-1 and enters the first SRS amplification pool 6-2; the second beam of light is reflected by the first reflecting mirror 3 and the second dichroic mirror 6-3 to encounter the Stokes seed light oppositely for the first amplification and compression; the unconsumed pumping light is reflected by the first dichroic mirror 6-1 and the third dichroic mirror 6-7 to enter the second SRS amplification pool 6-6, the Stokes seed light after the first amplification and compression passes through the second dichroic mirror 6-3 and is transmitted, the second reflecting mirror 6-4 and the third reflecting mirror 6-5 are reflected to enter the second SRS amplification pool 6-6 to meet the unconsumed pumping light in an opposite direction and perform the second amplification and compression, and the ultrashort Stokes seed light after the second amplification and compression passes through the third dichroic mirror 6-7 to be output.
The dichroic mirror is characterized in that: the first dichroic mirror 6-1 reflects the focused pump light to a high degree and enables the focused pump light to enter an SRS generating pool 5 to generate back Raman scattering to generate seed light, the first dichroic mirror 6-1 transmits the seed light to a high degree and enables the seed light to directly enter a first SRS amplifying pool 6-2 to meet with a pump source 1 in an opposite direction, the pump source coming out of the first SRS amplifying pool 6-2 after meeting in the opposite direction is not exhausted, the pump source is acted on a third dichroic mirror after being reflected by the first dichroic mirror 6-1 to further reflect the pump light which is not exhausted to a second SRS amplifying pool 6-6 in the third dichroic mirror to enter the second SRS amplifying pool 6-6, the seed light passes through the second dichroic mirror after being amplified and compressed for the first time and then passes through a second reflecting mirror and a third reflecting mirror to enter the second SRS amplifying pool 6-6, and the seed light in the second SRS amplifying pool 6-6 meets the pump light which is not exhausted in the opposite direction, and the seed light is compressed again and then is output through the third dichroic mirror 6-7 in a high-transmittance mode.
The SRS generating cell 5 generates Stokes seed light, which is low in light energy and wide in pulse width, the Stokes seed light enters the SRS secondary amplification system 6, and is amplified by pump light in the two amplification cells, that is, the pump light meets the other part of split light oppositely, and energy extraction and pulse width compression are performed.
The high-order Stokes light is generated in the Raman generation process, the first-order Stokes light is amplified, the high-order Stokes light cannot enter the first SRS amplification pool 6-2 through the first dichroic mirror 6-1, the influence of the high-order Stokes light on amplification compression can be effectively prevented, the Stokes light generated by the backward Raman generation pool 5 is opposite to the direction of the pump light, and the backward transmission of the backward Raman Stokes light in the SRS generation pool is opposite to the transmission direction of the pump light. Stokes light in the SRS generating pool 5 can meet with the pump light in an opposite direction for one time to realize a pre-compression effect, meanwhile, reverse Stokes seed light passing through the first dichroic mirror 6-1 meets with the second beam of light in an opposite direction, secondary compression is carried out, the energy of the second beam of light is extracted for amplification, the pump light which is not exhausted is subjected to amplification and compression again through the second SRS amplifying pool 6-6, a 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 convex lens 4 is focused 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 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 parallel and arranged at equal height, both are inclined at 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 generating pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 are all Raman active media, such as Ba (NO)3)2、CS2、H2Toluene, liquid oxygen and H2O, and other solid, gaseous, and liquid raman active media, with optical phonon lifetimes on the order of picoseconds. The wavelength of the single longitudinal mode laser selected by the pumping source 1 is between 200nm and 1500nm, the focal length range of the convex lens 4 is 10cm to 70cm, the pool length of the SRS generating pool 5 is 0.5cm to 120cm, and the pool length of the two SRS amplifying pools is 0.5cm to 150 cm.
In addition, a measurement system is added between the first dichroic mirror 6-1 and the SRS generation pool 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 waveform of the pump light and the Stokes seed light generated by the SRS generating pool 5; the wedge-shaped plate is an optical plate with two surfaces forming a certain included angle, and when light penetrates through the wedge-shaped plate, two beams of reflected light with energy of 4% of incident light can be reflected; the pumping light is reflected by the wedge-shaped plate to enter 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 divided into two beams of light with different energy ratios by replacing different beam splitters 2, so that the peak power of the Stokes light generated by the SRS generating pool 5 is equivalent to that of the second beam of light; the Stokes seed light finally output at this time 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 pumping source 1 is between 200nm and 1500nm, the pulse width is 0.1ns to 10ns, and the light path f' from the focal point incidence position of the SRS generating pool 5 to the focal point 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, τpFor the pulse width of pump source 1, n is the index of refraction of the medium in the pool of SRS generation pool 5. The focus is formed by the convex lens 4 on the SRS generating pool 5, the incident focus refers to the right boundary of the SRS generating pool 5, and light enters the SRS generating pool 5 from the right boundary of the SRS generating pool 5.
The focal length f of the convex lens 4 is d + f', and d is the distance from the center point of the convex lens 4 to the incidence point of the SRS generation cell focus, i.e. the cell mirror distance.
In order to ensure that the focus of the convex lens 4 is in the pool, the pool length of the SRS generating pool 5 and the pool length of the two SRS amplifying pools need to satisfy: l > f'.
Let η be the energy conversion efficiency and can be expressed as:
Epfor pump light energy, i.e. the output of the pump source 1, EsIs the Stokes light energy finally output by the second dichroic mirror 8.
The focus is formed by the convex lens 4 on the SRS generating pool 5, the incident focus refers to the right boundary of the SRS generating pool 5, and light enters the SRS generating pool 5 from the right boundary of the SRS generating pool 5.
The first embodiment is as follows: the present embodiment has the same structure as the above-mentioned embodiment, and has the following parameters:
the wavelength output by the pumping 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 1 ns; the media in the SRS generating pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 are all Ba (NO)3)2Crystal (1064nm Raman gain coefficient 11cm/GW, phonon lifetime 80ps)The lengths of the SRS generating pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 are all 100 mm; 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 the models of other devices are not limited. Considering the influence of loss and high-order Stokes, the actual energy conversion efficiency is about 20%, and under the same condition, the final output energy of the second SRS amplification pool is higher than that of the case of only arranging one SRS amplification pool.
It can be seen from fig. 2 that the output pulse width is 65.5ps, with significant compression compared to the 1ns pulse width of the input light.
Example two: in this embodiment, the pulse width of the pump source 1 is changed, and the remaining parameters are the same as those in the first embodiment, and the numerical result is simulated as shown in fig. 3. The effect of different pump source pulse widths on the output light pulse width and waveform.
Example three: 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 (532nm raman gain coefficient is 0.1cm/GW, phonon lifetime is 1.9ps) is used as raman medium, the cell lengths of the SRS generation cell 5, the first SRS amplification cell 6-2 and the second SRS amplification cell 6-6 are all 100mm, the distance between the convex lens 4 and the SRS generation cell 5 is 10cm, the focal length of the convex lens 4 is 14cm, other parameters are the same as the device model number as in the first embodiment, and the numerical simulation result of this embodiment is shown in fig. 4.
Comparative examples one and three, raman active media from Ba (NO)3)2And the deionized water is replaced, and finally the laser output of 93.8ps is output.
In the invention, the opposite encounter time can be adjusted by controlling the position of the SRS amplification pool, the efficiency is improved, less light enters the SRS generation pool 5 through beam splitting of the beam splitter, almost 10 percent of light enters the SRS generation pool, the pump light energy of the second beam of light which goes to the reflector 3 is larger, and when the reverse Stokes seed light passing through the first dichroic mirror meets the second beam of light in an opposite way, the energy which can be extracted is larger, so that the front edge rises faster; the input nanosecond can be input through generating an amplifying structure (an SRS generating pool 5 and an SRS amplifying pool), the output achieves compression effects of picoseconds, picoseconds and dozens of picoseconds, and the input pulse width is correspondingly adjusted according to different pool lengths.
The above-described embodiments are merely exemplary embodiments of the present invention, which should not be construed as limiting the scope of the present invention, and all modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Nothing in this specification is said to apply to the prior art.
Claims (10)
1. A pulse width compressor based on a stimulated Raman scattering secondary amplification structure, the pulse width compressor comprising: the SRS scanning device comprises a pumping source, a beam splitter, a first reflector, a convex lens, an SRS generating pool and an SRS secondary amplification 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 pump source sends out pump light, the pump light is divided into two beams of light through the beam splitter, the first beam of light is focused and reflected by the convex lens and a first dichroic mirror in the SRS secondary amplification system, the first beam of light enters the SRS generation pool to generate Stokes seed light which backs to the SRS generation pool, and the original path of the Stokes seed light returns to pass through the first dichroic mirror and enters the first SRS amplification pool; the second beam of light is reflected by the first reflecting mirror and the second dichroic mirror and meets the Stokes seed light oppositely for first amplification and compression; the unconsumed pumping light is reflected by the first dichroic mirror and the third dichroic mirror to enter the second SRS amplification pool, the Stokes seed light after the first amplification and compression passes through the second dichroic mirror, is reflected by the second reflecting mirror and the third reflecting mirror to enter the second SRS amplification pool to meet the unconsumed pumping light in opposite directions and is subjected to the second amplification and compression, and the ultrashort Stokes seed light after the second amplification and compression passes through the third dichroic mirror to be output.
2. The stimulated raman scattering secondary amplification structure-based pulse width compressor of claim 1, wherein the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror are highly transmissive to Stokes seed light and highly reflective to pump light.
3. The excited Raman scattering secondary amplification structure-based pulse width compressor as claimed in claim 1, wherein the medium in the SRS generating cell, the first SRS amplification cell and the second SRS amplification cell is Ba (NO)3)2、CS2、H2Toluene, liquid oxygen and H2At least one raman active agent in O.
4. The excited raman scattering secondary amplification structure-based pulse width compressor of claim 1, wherein the focus of the convex lens is at the center of the SRS generation cell; first dichroic mirror and the parallel equal height setting of second dichroic mirror, the two is all inclined 45 and is placed, and third dichroic mirror is located the below of first dichroic mirror, and the contained angle between the two is 90.
5. The pulse width compressor based on the stimulated raman scattering secondary amplification structure of claim 1, wherein the pump source selects a single longitudinal mode laser with a wavelength between 200nm and 1500nm, the focal length of the convex lens ranges from 10cm to 70cm, the SRS generation pool length ranges from 0.5cm to 120cm, and the two SRS amplification pool lengths range from 0.5cm to 150 cm.
6. The stimulated raman scattering secondary amplification structure-based pulse width compressor of claim 1, wherein a measurement system is added between the first dichroic mirror and the SRS generation 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 the Stokes seed light generated by the SRS generating pool; the wedge-shaped plate is an optical plate with two surfaces forming a certain included angle, and when light penetrates through the wedge-shaped plate, two beams of reflected light with energy of 4% of incident light can be reflected; the pumping light is reflected by the wedge-shaped plate to enter 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 divided into two beams of light with different energy ratios by replacing different beam splitters, so that the peak power of the Stokes light generated by the SRS generating pool is equivalent to that of the second beam of light; 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 the stimulated raman scattering secondary amplification structure of claim 1, wherein the wavelength of the single longitudinal mode laser selected by the pump source is between 200nm and 1500nm, the pulse width is between 0.1ns and 10ns, and the optical path f' from the focal point to the focal point of the SRS generation pool is half of the optical length corresponding to the pulse width, and is expressed as:
where c is the speed of light in vacuum, τpIs the pulse width of the pumping source, and n is the refractive index of the medium in the SRS generating pool;
the focal length f of the convex lens is d + f', and d is the distance from the center point of the convex lens to the incidence position of the SRS generation pool focus, namely the distance between the pool mirrors;
the pool lengths of the SRS generating pool and the two SRS amplifying pools need to meet the following requirements: l > f'.
9. The pulse width compressor based on the stimulated raman scattering secondary amplification structure according to claim 1, wherein the pulse width compressor amplifies the first-order Stokes light, the high-order Stokes light does not enter the two SRS amplification cells through the first dichroic mirror, the high-order Stokes light is effectively prevented from influencing the amplification and compression, and the dichroic mirror is used for reflection and filtering; in the SRS generating pool, backward transmission is carried out on backward Raman Stokes light, the transmission direction of the backward Raman Stokes light is opposite to that of pump light, Stokes light in the SRS generating pool meets with the pump light in an opposite direction for one time, meanwhile, reverse Stokes seed light passing through a first dichroic mirror meets with a second beam of light in an opposite direction, secondary compression is carried out, the energy of the second beam of light is extracted for amplification, undepleted pump light amplifies and compresses the seed light again through a second SRS amplifying pool, the triple compression effect is realized, and ultrashort pulses are output.
10. The pulse width compressor based on the stimulated raman scattering secondary amplification structure according to claim 1, wherein the meeting condition of the Stokes light and the second light is changed by controlling the positions of the two SRS amplification pools, so as to change the waveform and the pulse width of the output, and the optimal condition is that the Stokes light and the second light meet at the centers of the two SRS amplification pools; the front edge is controlled to be amplified, and the rear edge is not amplified, so that a special required waveform can be generated; since the Stokes light is amplified in the SRS generation pool, a longer and wider waveform can be generated by changing the lengths of the two SRS amplification pools.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020024986A1 (en) * | 2000-07-14 | 2002-02-28 | Takashi Arisawa | Systems for generating short-pulse laser light |
| US20100188733A1 (en) * | 2007-06-15 | 2010-07-29 | Amplitude Systemes | Ultra-short high-power light pulse source |
| CN105024274A (en) * | 2014-04-24 | 2015-11-04 | 中国科学院大连化学物理研究所 | Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method |
| CN110021873A (en) * | 2019-05-28 | 2019-07-16 | 长春理工大学 | A kind of laser based on cascade stimulated scattering |
| CN112038874A (en) * | 2020-08-03 | 2020-12-04 | 河北工业大学 | Self-pumping SBS pulse compression system of twin-pool |
| CN213304579U (en) * | 2020-11-05 | 2021-05-28 | 河北工业大学 | Multi-wavelength output short pulse laser |
| CN214379228U (en) * | 2021-04-12 | 2021-10-08 | 河北工业大学 | Device capable of inhibiting tail modulation and obtaining picosecond pulse compression |
-
2022
- 2022-01-13 CN CN202210034661.0A patent/CN114389138B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020024986A1 (en) * | 2000-07-14 | 2002-02-28 | Takashi Arisawa | Systems for generating short-pulse laser light |
| US20100188733A1 (en) * | 2007-06-15 | 2010-07-29 | Amplitude Systemes | Ultra-short high-power light pulse source |
| CN105024274A (en) * | 2014-04-24 | 2015-11-04 | 中国科学院大连化学物理研究所 | Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method |
| CN110021873A (en) * | 2019-05-28 | 2019-07-16 | 长春理工大学 | A kind of laser based on cascade stimulated scattering |
| CN112038874A (en) * | 2020-08-03 | 2020-12-04 | 河北工业大学 | Self-pumping SBS pulse compression system of twin-pool |
| CN213304579U (en) * | 2020-11-05 | 2021-05-28 | 河北工业大学 | Multi-wavelength output short pulse laser |
| CN214379228U (en) * | 2021-04-12 | 2021-10-08 | 河北工业大学 | Device capable of inhibiting tail modulation and obtaining picosecond pulse compression |
Non-Patent Citations (1)
| Title |
|---|
| V. P. KOCHANOV, ET AL.: "\"Spontaneous and Backward Stimulated Raman Scattering of Light in Methane\"", 《OPTICS AND SPECTROSCOPY》, vol. 101, no. 2, pages 183 - 190 * |
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