CN114256729B - Mid-infrared Raman laser with narrow pulse width, high peak power and high average power - Google Patents
Mid-infrared Raman laser with narrow pulse width, high peak power and high average power Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 303
- 230000003321 amplification Effects 0.000 claims abstract description 27
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims description 85
- 238000005086 pumping Methods 0.000 claims description 50
- 239000007789 gas Substances 0.000 claims description 42
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims description 15
- 229910052805 deuterium Inorganic materials 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 229910052734 helium Inorganic materials 0.000 claims description 10
- 239000001307 helium Substances 0.000 claims description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052743 krypton Inorganic materials 0.000 claims description 2
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052754 neon Inorganic materials 0.000 claims description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 2
- 238000002310 reflectometry Methods 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 claims description 2
- 229910052724 xenon Inorganic materials 0.000 claims description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 2
- 230000009022 nonlinear effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01S3/302—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 an optical fibre
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
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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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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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
- H01S3/106—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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Abstract
The invention provides a narrow pulse width high peak power high average power mid-infrared band Raman laser output scheme, which utilizes the pulse width narrow-pressing characteristic of stimulated Raman scattering to pump Raman active gas to generate mid-infrared Raman seed light with a narrow pulse width, and utilizes a multistage amplification system to amplify the seed light to obtain mid-infrared Raman laser output with high peak power, high average power and narrow pulse width. The heat-generating region in the nonlinear effect process of the Raman active medium can be effectively dispersed, the heat management is improved, and the Raman active medium has excellent scaling amplification and wavelength ductility.
Description
Technical Field
The invention relates to the technical field of nonlinear laser frequency conversion, in particular to a narrow pulse width high peak power high average power mid-infrared Raman laser.
Background
The mid-infrared band laser with the wavelength of 2-5 μm has important application value in the fields of medical science, atmospheric detection, photoelectric countermeasure, organic matter detection and the like. By means of stimulated Raman scattering, raman laser of middle infrared band can be generated through laser frequency down-conversion. Meanwhile, the high-power mid-infrared Raman laser output can be realized by taking the gas with high damage threshold and large Raman frequency shift as a Raman active medium and selecting proper pumping laser wavelength, and the technology has proved to be an effective means for generating mid-infrared laser.
High power, high efficiency, narrow pulse width lasers have been the focus of research by researchers. The laser with narrow pulse width can be obtained by the technologies of pulse width contraction, soliton stimulated Raman scattering, cross phase modulation pulse width compression, interferometer pulse width compression and the like of the fiber grating, and few research reports on Raman laser pulse width compression are provided.
Disclosure of Invention
Based on the pulse width narrowing characteristic of stimulated Raman scattering, pumping Raman active medium gas by pumping laser with energy just exceeding the threshold energy of stimulated Raman scattering, generating Raman laser in a middle infrared band, and narrowing the pulse width of the Raman light by using less effective pumping laser pulse time; meanwhile, inert gas is doped into the Raman pool, and the partial pressure of Raman active gas is reduced, so that the gain coefficient is reduced due to the increase of the Raman linewidth and the reduction of the particle number of a Raman medium, the threshold power density of Raman conversion is improved, and the narrow-pulse-width middle-infrared band Raman seed light can be obtained; and then obtaining the mid-infrared Raman laser output with narrow pulse width and high power by a seed light amplifying means.
The invention adopts the following technical means:
a mid-infrared raman laser comprising: the medium infrared Raman seed light generation system comprises a Q-switched pulse solid laser I, a Raman cell I and a dichroic mirror I; the Q-switched pulse solid laser is used for outputting pumping laser with required wavelength; the Raman Chi Yiyong is used for receiving the pumping laser output by the Q-switched pulse solid laser I and converting the pumping laser into middle infrared Raman seed light; the dichroic mirror I is used for transmitting the mid-infrared Raman seed light to the multistage amplification system;
the multistage amplification system comprises a primary amplification unit and a secondary amplification unit; the first-stage amplifying unit comprises a Q-switched pulse solid laser II, a dichroic mirror II and a Raman pool II; the Raman Chi Er is used for receiving the middle infrared Raman seed light and the pumping laser which is output by the Q-switched pulse solid laser and is opposite to the propagation route of the middle infrared Raman seed light, and outputting first-level amplified Raman light; the dichroic mirror II is used for reflecting the primary amplified Raman light to the secondary amplifying unit;
the second-stage amplifying unit comprises a Q-switched pulse solid laser III, a dichroic mirror IV, a Raman pool III and a dichroic mirror III; the Raman Chi Sanyong is used for receiving the first-order amplified Raman light and pumping laser light which is output by the Q-switched pulse solid laser device three and is opposite to the propagation route of the first-order amplified Raman light, and outputting mid-infrared Raman light through the dichroic mirror four; the dichroic mirror III is used for reflecting the first-order amplified Raman light to the Raman pool III;
the time synchronization system comprises a time delay device which is used for regulating and controlling the time of the pump laser output by the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser, so that the synchronous transmission of the pump laser and the Raman light in time is realized.
Further, the multistage amplification system comprises a multistage amplification unit; each stage of amplifying unit comprises a Q-switched pulse solid laser and a Raman cell, and the amplified Raman light is separated and output by a dichroic mirror.
Furthermore, the Raman tank is a single-pass tank, a three-pass tank, a five-pass tank or a 2N+1-pass tank with good air tightness, different Raman active gases can be filled, and the gas pressure can be adjusted between 0.1MPa and 10 MPa; the length of the Raman cell of the amplifying unit is larger than the pulse width multiplied by the speed of light/the number of Raman cell passes of the pumping laser.
Further, the dichroic mirror is used for separating the pump laser light and the mid-infrared Raman light, wherein the dichroic mirror is coated with an antireflection film with the mid-infrared Raman light wavelength transmittance higher than 99% and a high-reflection film with the pump laser light wavelength reflectance higher than 99%; the dichroic mirror II, the dichroic mirror III and the dichroic mirror IV in the multistage amplification system are plated with an antireflection film with the transmission rate of the pumping laser wavelength higher than 99% and a high-reflection film with the optical wavelength reflectivity of the mid-infrared Raman higher than 99%.
Further, after passing through the inlet of the first Raman cell, the pump laser output by the Q-switched pulse solid laser is converged by the first concave reflector, then the focus is focused at the center of the first Raman cell, and then the pump laser is formed into parallel beams by the second concave reflector and is emitted from the outlet of the first Raman cell; the middle infrared Raman seed light is reflected by the right-angle prism I and the right-angle prism II after passing through the inlet of the Raman pond II and then is emitted out from the outlet of the Raman pond II; after the entrance of the first-order amplified Raman light Jing Laman Chi San, the first-order amplified Raman light is reflected by the right-angle prism III and the right-angle prism IV and then emitted from the exit of the Raman pond III; the concave reflector and the right-angle prism in the Raman pool are both arranged along the direction of the laser propagation optical axis.
The invention also provides a method for generating high-power narrow-pulse-width mid-infrared Raman laser, which comprises the steps of using the laser, and filling mixed gas consisting of Raman active gas and inert gas into a first Raman cell; adjusting the output power of the Q-switched pulse solid laser I and the partial pressure of the Raman active gas and the inert gas in the Raman cell so that the output power just exceeds the stimulated Raman scattering threshold of the Raman active gas; the pumping laser acts with the Raman active gas medium to generate stimulated Raman scattering effect and output narrow pulse width Raman seed light of the middle infrared band.
Filling the same kind of Raman active gas in a Raman Chi Er tank and a Raman tank III, wherein the gas pressure is between 1MPa and 10 MPa; in the multistage amplifying system, the Raman cell is filled with the same kind of Raman active gas medium with higher pressure, and pumping laser with higher energy is selected for pumping, so that seed light can be effectively amplified.
Further, the pressure of the Raman active gas in the first Raman tank is less than 1MPa; the partial pressure of the Raman active gas is 10% -50%; inert gases include helium, neon, argon, krypton, xenon, and the like; the raman active gas includes methane, deuterium, hydrogen, and the like.
Further, the pump laser output by the Q-switched pulse solid laser adopted in the first amplifying unit and all amplifying units is near-infrared wavelength laser with the wavelength consistent with the repetition frequency.
Further, pump laser output by the Q-switched pulse solid laser is incident into the first Raman cell to generate mid-infrared Raman seed light; separating the mid-infrared Raman seed light and the residual pump laser by a dichroic mirror, reflecting the residual pump laser to a beam collector I, and enabling the mid-infrared Raman seed light to enter a Raman pool II for primary amplification by the dichroic mirror I;
the pumping laser output by the Q-switched pulse solid laser is transmitted to the Raman pond II along the opposite route of the Raman seed light transmission through the dichroic mirror II, and the first-stage amplified Raman light is output after the pumping of the intermediate infrared Raman seed light; the residual pump laser is reflected to a beam collector II through a dichroic mirror I; the first-order amplified Raman light is reflected to a dichroic mirror III through the dichroic mirror II and then reflected to a Raman pool III for second-order amplification through the dichroic mirror III;
the pumping laser output by the Q-switched pulse solid laser device III is incident into the Raman pond III along the reverse route of the first-stage amplified Raman light propagation through the dichroic mirror IV, after the first-stage amplified Raman light is pumped, the residual pumping laser is incident into the beam current collector III through the dichroic mirror III, and the second-stage amplified narrow-pulse-width mid-infrared Raman laser is emitted through the dichroic mirror IV.
Further, the pump laser with different wavelengths and the raman active medium are selected to be combined to output the mid-infrared raman laser with different wavelengths, including but not limited to: the Q-switched pulse solid laser outputs laser with the wavelength of 1064nm, the Raman tank is filled with methane gas, and 2.8 mu m second-order Stokes light is output; the Q-switched pulse solid laser outputs laser with the wavelength of 1064nm, deuterium gas is filled in the Raman cell, and 2.8 mu m second-order Stokes light is output; the Q-switched pulse solid laser outputs 1.53 mu m wavelength, hydrogen is filled in a Raman cell, and 4.2 mu m first-order Stokes light is output; the Q-switched pulse solid laser outputs laser with the wavelength of 1.56 mu m, the Raman cell is filled with hydrogen, and 4.4 mu m first-order Stokes light is output.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, by using a seed light multistage amplification scheme, the heat generation area in the nonlinear effect process of the Raman active medium is greatly dispersed, the heat management is improved, and the Raman laser output with high average power can be realized.
2. The invention can greatly narrow the pulse width of the Raman seed light by adjusting the pumping laser energy and the partial pressure of the gas in the Raman cell, and obtain the laser with narrow pulse width and high peak power.
3. The invention can select picosecond or femtosecond laser to pump the Raman seed light generating system, thereby obtaining narrower picosecond or even femtosecond seed source, and realizing output amplified picosecond or femtosecond Raman light, and the scaling amplification is superior to that of solid picosecond femtosecond laser.
4. The invention can realize the mid-infrared narrow linewidth Raman amplified light with different wavelengths of 2.8 mu m,2.9 mu m,4.2 mu m,4.3 mu m,4.4 mu m and the like by selecting different Raman active mediums and pump lasers with different wavelengths for combination, and has very good wavelength expansibility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a laser structure according to the present invention.
In the figure: 1-modulating Q pulse solid laser I; 2-raman pool one; 3-concave mirror one; a second concave reflector; 5-dichroic mirror one; 6-a second Raman tank; 7-a right-angle prism I; 8-a right-angle prism II; 9-a dichroic mirror II; 10-modulating Q pulse solid laser II; 11-dichroic mirror three; 12-raman pool three; 13-a right-angle prism III; 14-a right-angle prism IV; 15-a dichroic mirror IV; 16-Q-switched pulse solid laser III; 17-beam dump one; 18-a second beam collector; 19-a beam collector III; a 20-time delay; 21-energy meter.
Detailed Description
The invention is further described in connection with the following detailed description, but is not to be construed as limiting the scope of the invention.
Example 1
The method comprises the steps of taking a 1064nm pump laser light path output by a Q-switched pulse solid laser as a reference, placing a first Raman pool, wherein the first Raman pool is a three-path pool, converging pump laser light through an inlet of the first Raman pool, focusing a focal point on the center of the first Raman pool after converging the pump laser light through a first concave reflector, and forming parallel light beams through a second concave reflector to be emitted from an outlet of the first Raman pool. The first Raman tank is filled with a mixed gas of 0.5MPa methane gas and 1.5MPa helium gas. The output power of the Q-switched pulse solid laser I is regulated, and the partial pressure of methane and helium in the Raman pool I is regulated, so that the pumping laser power just exceeds the stimulated Raman scattering threshold of methane, and therefore methane second-order Stokes Raman seed light with the wavelength of 2.8 microns is generated, and a narrower pulse width is obtained. The remaining 1064nm pump laser light which is output by the Q-switched pulse solid state laser and is not completely converted is reflected into the beam dump I through the dichroic mirror I.
The methane second-order Stokes seed light generated in the first Raman cell passes through the first dichroic mirror and then enters the second Raman cell, which is a three-way cell. The middle infrared seed light with the diameter of 2.8 μm is reflected by the right-angle prism I and the right-angle prism II and then is emitted from the outlet of the Raman pool II. Meanwhile, 1064nm pump laser output by the Q-switched pulse solid laser II is transmitted through the dichroic mirror II and then enters the Raman cell II along the opposite transmission route of the seed light. And filling 3MPa methane gas into the second Raman pool, and realizing a primary amplification effect on the infrared Raman seed light in the thickness of 2.8 mu m generated in the previous step by counter-propagating 1064nm laser pumping. The residual 1064nm pump laser which is output by the Q-switched pulse solid laser and is not completely converted after passing through the Raman cell II is reflected into the beam collector II through the dichroic mirror I.
The once amplified 2.8 mu m middle infrared Raman light obtained by the second Raman pond is reflected by the second dichroic mirror and the third dichroic mirror in sequence and then enters the third Raman pond, the third Raman pond is a three-way pond, and the third Raman pond is reflected by the third right-angle prism and the fourth right-angle prism and then is emitted from the outlet of the third Raman pond. Meanwhile, 1064nm pump laser output by the Q-switched pulse solid laser III is transmitted through the dichroic mirror IV and then enters the Raman cell III along the opposite transmission route of the seed light. And filling 3MPa methane gas into the third Raman cell, and carrying out secondary amplification on the 2.8 mu m Raman light amplified in the previous step by counter-propagating 1064nm laser pumping. The residual 1064nm pump light which is output by the Q-switched pulse solid laser III and is not completely converted after being subjected to Raman Chi San is incident into the beam collector III through the dichroic mirror III. The secondarily amplified 2.8 mu m mid-infrared Raman light is emitted after passing through the dichroic mirror IV, and the single pulse energy and average power of the output mid-infrared Raman light are measured through an energy meter.
Q switches on the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser are regulated and controlled through a time delay device, so that synchronous transmission of pump light and Raman light in time is realized.
Example 2
The method comprises the steps of taking a 1064nm pump laser light path output by a Q-switched pulse solid laser as a reference, placing a first Raman pool, wherein the first Raman pool is a three-path pool, converging pump laser light through an inlet of the first Raman pool, focusing a focal point on the center of the first Raman pool after converging the pump laser light through a first concave reflector, and forming parallel light beams through a second concave reflector to be emitted from an outlet of the first Raman pool. The first Raman cell is filled with mixed gas of 0.5MPa deuterium gas and 1.5MPa helium gas. The output power of the Q-switched pulse solid laser I is regulated, and the partial pressure of deuterium and helium in the Raman pool I is regulated, so that the pumping laser power just exceeds the stimulated Raman scattering threshold of deuterium, and thereby the 2.8 mu m deuterium second-order Stokes Raman seed light is generated, and a narrower pulse width is obtained. The remaining 1064nm pump laser light which is output by the Q-switched pulse solid state laser and is not completely converted is reflected into the beam dump I through the dichroic mirror I.
The deuterium second-order stokes seed light generated in the first Raman cell passes through the first dichroic mirror and then enters the second Raman cell, and the second Raman cell is a three-way cell. The middle infrared seed light with the diameter of 2.8 μm is reflected by the right-angle prism I and the right-angle prism II and then is emitted from the outlet of the Raman pool II. Meanwhile, 1064nm pump laser output by the Q-switched pulse solid laser II is transmitted through the dichroic mirror II and then enters the Raman cell II along the opposite transmission route of the seed light. And filling 3MPa deuterium gas into the second Raman pool, and pumping the 2.8 mu m middle infrared Raman seed light generated in the previous step by counter-propagating 1064nm laser to realize a primary amplification effect. The residual 1064nm pump laser which is output by the Q-switched pulse solid laser and is not completely converted after passing through the Raman cell II is reflected into the beam collector II through the dichroic mirror I.
The once amplified 2.8 mu m middle infrared Raman light obtained by the second Raman pond is reflected by the second dichroic mirror and the third dichroic mirror in sequence and then enters the third Raman pond, the third Raman pond is a three-way pond, and the third Raman pond is reflected by the third right-angle prism and the fourth right-angle prism and then is emitted from the outlet of the third Raman pond. Meanwhile, 1064nm pump laser output by the Q-switched pulse solid laser III is transmitted through the dichroic mirror IV and then enters the Raman cell III along the opposite transmission route of the seed light. And filling 3MPa deuterium gas into the third Raman cell, and carrying out secondary amplification on the 2.8 mu m Raman light amplified in the previous step by counter-propagating 1064nm laser pumping. The residual 1064nm pump light which is output by the Q-switched pulse solid laser III and is not completely converted after being subjected to Raman Chi San is incident into the beam collector III through the dichroic mirror III. The secondarily amplified 2.8 mu m mid-infrared Raman light is emitted after passing through the dichroic mirror IV, and the single pulse energy and average power of the output mid-infrared Raman light are measured through an energy meter.
Q switches on the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser are regulated and controlled through a time delay device, so that synchronous transmission of pump light and Raman light in time is realized.
Example 3
The method comprises the steps of taking a pumping laser light path of 1.53 mu m output by a Q-switched pulse solid laser as a reference, placing a first Raman cell, wherein the first Raman cell is a three-path cell, converging pumping laser light through an inlet of the first Raman cell, focusing a focus on the center of the first Raman cell after converging the pumping laser light through a first concave reflector, and forming parallel light beams through a second concave reflector to be emitted from an outlet of the first Raman cell. The first Raman tank is filled with mixed gas of 0.5MPa hydrogen and 1.5MPa helium. The output power of the Q-switched pulse solid laser I is regulated, and the partial pressure of hydrogen and helium in the Raman pool I is regulated, so that the pumping laser power just exceeds the stimulated Raman scattering threshold of the hydrogen, and the 4.2 mu m deuterium second-order Stokes Raman seed light is generated, so that narrower pulse width can be obtained. The remaining 1.53 μm pump laser light which is output by the Q-switched pulse solid-state laser and is not completely converted is reflected into the beam dump I by the dichroic mirror I.
The deuterium second-order stokes seed light generated in the first Raman cell passes through the first dichroic mirror and then enters the second Raman cell, and the second Raman cell is a three-way cell. The intermediate infrared seed light with the diameter of 4.2 μm is reflected by the right-angle prism I and the right-angle prism II and then is emitted from the outlet of the Raman pool II. Meanwhile, the 1.53 mu m pump laser output by the Q-switched pulse solid laser II is transmitted through the dichroic mirror II and then enters the Raman pool II along the opposite transmission route of the seed light. And 3MPa hydrogen is filled in the second Raman pool, and a first-stage amplification effect is realized on the infrared Raman seed light in the thickness of 4.2 mu m generated in the previous step through counter-propagating 1.53 mu m laser pumping. The residual 1.53 mu m pump laser which is output by the Q-switched pulse solid laser and is not completely converted after passing through the Raman cell II is reflected into the beam collector II through the dichroic mirror I.
The once amplified infrared Raman light with the wavelength of 4.2 μm is obtained through the second Raman pond, reflected by the second dichroic mirror and the third dichroic mirror in sequence, and then enters the third Raman pond, which is a three-way pond and is emitted from the outlet of the third Raman pond after being reflected by the third right-angle prism and the fourth right-angle prism. Meanwhile, the 1.53 mu m pump laser output by the Q-switched pulse solid laser III is transmitted through the dichroic mirror IV and then enters the Raman pool III along the opposite transmission route of the seed light. And filling 3MPa hydrogen into the Raman cell III, and carrying out secondary amplification on the 4.2 mu m Raman light amplified in the previous step by counter-propagating 1.53 mu m laser pumping. The residual 1.53 mu m pump light which is output by the Q-switched pulse solid laser III and is not completely converted after being subjected to Raman Chi San is incident into the beam collector III through the dichroic mirror III. The secondary amplified 4.2 mu m mid-infrared Raman light is emitted after passing through the dichroic mirror IV, and the single pulse energy and average power of the output mid-infrared Raman light are measured through an energy meter.
Q switches on the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser are regulated and controlled through a time delay device, so that synchronous transmission of pump light and Raman light in time is realized.
Example 4
The method comprises the steps of taking a pumping laser light path of 1.56 mu m output by a Q-switched pulse solid laser as a reference, placing a first Raman cell, wherein the first Raman cell is a three-path cell, converging pumping laser light through an inlet of the first Raman cell, focusing a focus on the center of the first Raman cell after converging the pumping laser light through a first concave reflector, and forming parallel light beams through a second concave reflector to be emitted from an outlet of the first Raman cell. The first Raman tank is filled with mixed gas of 0.5MPa hydrogen and 1.5MPa helium. The output power of the Q-switched pulse solid laser I is regulated, and the partial pressure of hydrogen and helium in the Raman pool I is regulated, so that the pumping laser power just exceeds the stimulated Raman scattering threshold of the hydrogen, and the 4.4 mu m deuterium second-order Stokes Raman seed light is generated, so that narrower pulse width can be obtained. The remaining 1.56 μm pump laser light that is output by the Q-switched pulsed solid state laser, which is not completely converted, is reflected by the dichroic mirror one into the beam dump one.
The deuterium second-order stokes seed light generated in the first Raman cell passes through the first dichroic mirror and then enters the second Raman cell, and the second Raman cell is a three-way cell. The intermediate infrared seed light with the wavelength of 4.4 μm is reflected by the right-angle prism I and the right-angle prism II and then is emitted from the outlet of the Raman pool II. Meanwhile, the 1.56 mu m pump laser output by the Q-switched pulse solid laser II is transmitted through the dichroic mirror II and then enters the Raman pool II along the opposite transmission route of the seed light. And 3MPa hydrogen is filled in the second Raman pool, and a first-stage amplification effect is realized on the infrared Raman seed light in the thickness of 4.4 mu m generated in the previous step through counter-propagating 1.56 mu m laser pumping. The residual 1.56 mu m pump laser which is output by the Q-switched pulse solid laser and is not completely converted after passing through the Raman cell II is reflected into the beam collector II through the dichroic mirror I.
The once amplified infrared Raman light in the size of 4.4 mu m is obtained through the second Raman pond, reflected by the second dichroic mirror and the third dichroic mirror in sequence, and then enters the third Raman pond, which is a three-way pond and is emitted from the outlet of the third Raman pond after being reflected by the third right-angle prism and the fourth right-angle prism. Meanwhile, the 1.56 mu m pump laser output by the Q-switched pulse solid laser III is transmitted through the dichroic mirror IV and then enters the Raman pool III along the opposite transmission route of the seed light. And filling 3MPa hydrogen into the Raman cell III, and carrying out secondary amplification on the 4.4 mu m Raman light amplified in the previous step by counter-propagating 1.56 mu m laser pumping. The residual 1.56 mu m pump light which is output by the Q-switched pulse solid laser III and is not completely converted after being subjected to Raman Chi San is incident into a beam collector III through a dichroic mirror III. The secondary amplified 4.4 mu m mid-infrared Raman light is emitted after passing through the dichroic mirror IV, and the single pulse energy and average power of the output mid-infrared Raman light are measured through an energy meter.
Q switches on the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser are regulated and controlled through a time delay device, so that synchronous transmission of pump light and Raman light in time is realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. A method for generating high-power narrow-pulse-width mid-infrared Raman laser is characterized in that a mid-infrared Raman laser is used, and a mixed gas consisting of Raman active gas and inert gas is filled in a first Raman cell; adjusting the output power of the Q-switched pulse solid laser I and the partial pressure of the Raman active gas and the inert gas in the Raman cell so that the output power just exceeds the stimulated Raman scattering threshold of the Raman active gas; filling the same kind of Raman active gas in a Raman Chi Er tank and a Raman tank III, wherein the gas pressure is between 1MPa and 10 MPa;
the mid-infrared Raman laser comprises: the medium infrared Raman seed light generation system comprises a Q-switched pulse solid laser I, a Raman cell I and a dichroic mirror I; the Q-switched pulse solid laser is used for outputting pumping laser with required wavelength; the Raman Chi Yiyong is used for receiving the pumping laser output by the Q-switched pulse solid laser I and converting the pumping laser into middle infrared Raman seed light; the dichroic mirror I is used for transmitting the mid-infrared Raman seed light to a multistage amplification system;
the multistage amplification system comprises a primary amplification unit and a secondary amplification unit; the primary amplifying unit comprises a Q-switched pulse solid laser II, a dichroic mirror II and a Raman pool II; the Raman Chi Er is used for receiving the middle infrared Raman seed light and the pumping laser which is output by the Q-switched pulse solid laser and is opposite to the propagation route of the middle infrared Raman seed light, and outputting first-stage amplified Raman light; the dichroic mirror II is used for reflecting the primary amplified Raman light to the secondary amplifying unit;
the second-stage amplifying unit comprises a Q-switched pulse solid laser III, a dichroic mirror IV, a Raman pool III and a dichroic mirror III; the Raman Chi Sanyong is used for receiving the first-order amplified Raman light and pumping laser light which is output by the Q-switched pulse solid laser, is opposite to the propagation route of the first-order amplified Raman light, and outputs mid-infrared Raman light through the dichroic mirror; the dichroic mirror III is used for reflecting the first-order amplified Raman light to the Raman pool III;
the time synchronization system comprises a time delay device, a first time delay device, a second time delay device and a third time delay device, wherein the time delay device is used for adjusting and controlling the time of the output pump laser of the first Q-switched pulse solid laser, the second Q-switched pulse solid laser and the third Q-switched pulse solid laser;
the first Raman pool, the first Raman Chi Er and the second Raman Chi San are single-pass pools, three-pass pools, five-pass pools or 2N+1-pass pools; the length of the Raman Chi Er and the Raman pool III is larger than the pulse width multiplied by the speed of light of the pumping laser/Raman Chi Chengshu;
the dichroic mirror is coated with an antireflection film with the light wavelength transmittance of the mid-infrared Raman being higher than 99% and a high-reflection film with the light wavelength reflectance of the pumping laser being higher than 99%; the second dichroic mirror, the third dichroic mirror and the fourth dichroic mirror are plated with an antireflection film with the transmission rate of the pumping laser wavelength higher than 99% and a high-reflection film with the optical wavelength reflectivity of the mid-infrared Raman higher than 99%;
the pumping laser output by the Q-switched pulse solid laser passes through an inlet of the first Raman cell, is converged by the first concave reflector, then focused at the center of the first Raman cell, and is formed into parallel beams by the second concave reflector to be emitted from an outlet of the first Raman cell; the middle infrared Raman seed light is reflected by the right-angle prism I and the right-angle prism II after passing through the inlet of the Raman pond II and then is emitted out from the outlet of the Raman pond II; after the entrance of the first-order amplified Raman light Jing Laman Chi San, the first-order amplified Raman light is reflected by the right-angle prism III and the right-angle prism IV and then emitted from the exit of the Raman pond III; the concave reflector and the right-angle prism in the Raman pool are both arranged along the direction of the laser propagation optical axis.
2. The method of claim 1, wherein the raman-active gas pressure in the raman cell one is less than 1MPa; the partial pressure of the Raman active gas is 10% -50%; the inert gas comprises helium, neon, argon, krypton and xenon; the raman-active gas comprises methane, deuterium, and hydrogen.
3. The method of claim 1, wherein the pump laser light output by the first Q-switched pulse solid state laser, the second Q-switched pulse solid state laser, and the third Q-switched pulse solid state laser is near infrared laser light having a wavelength consistent with a repetition rate.
4. The method of claim 1, wherein pump laser light output by the Q-switched pulsed solid state laser is incident into the raman pool one to generate mid-infrared raman seed light; separating the mid-infrared Raman seed light and the residual pump laser by a dichroic mirror, reflecting the residual pump laser to a beam collector I, and enabling the mid-infrared Raman seed light to enter a Raman pool II for primary amplification by the dichroic mirror I;
the pumping laser output by the Q-switched pulse solid laser is transmitted to the Raman pond II along the opposite route of the Raman seed light transmission through the dichroic mirror II, and the first-stage amplified Raman light is output after the pumping of the intermediate infrared Raman seed light; the residual pump laser is reflected to a beam collector II through a dichroic mirror I; the first-order amplified Raman light is reflected to a dichroic mirror III through the dichroic mirror II and then reflected to a Raman pool III for second-order amplification through the dichroic mirror III;
the pumping laser output by the Q-switched pulse solid laser device III is incident into the Raman pond III along the reverse route of the first-stage amplified Raman light propagation through the dichroic mirror IV, after the first-stage amplified Raman light is pumped, the residual pumping laser is incident into the beam current collector III through the dichroic mirror III, and the second-stage amplified narrow-pulse-width mid-infrared Raman laser is emitted through the dichroic mirror IV.
5. The method according to claim 1, wherein the Q-switched pulse solid-state laser outputs laser light with a wavelength of 1064nm, the Raman cell is filled with methane gas, and 2.8 μm second order Stokes light is output; the Q-switched pulse solid laser outputs laser with the wavelength of 1064nm, deuterium gas is filled in the Raman cell, and 2.8 mu m second-order Stokes light is output; the Q-switched pulse solid laser outputs 1.53 mu m wavelength, hydrogen is filled in a Raman cell, and 4.2 mu m first-order Stokes light is output; the Q-switched pulse solid laser outputs laser with the wavelength of 1.56 mu m, the Raman cell is filled with hydrogen, and 4.4 mu m first-order Stokes light is output.
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