CN116247505A - Eye-safe band Raman frequency-shift laser device of LD side pump - Google Patents
Eye-safe band Raman frequency-shift laser device of LD side pump Download PDFInfo
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- CN116247505A CN116247505A CN202310100619.9A CN202310100619A CN116247505A CN 116247505 A CN116247505 A CN 116247505A CN 202310100619 A CN202310100619 A CN 202310100619A CN 116247505 A CN116247505 A CN 116247505A
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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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
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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
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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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- 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
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/163—Solid materials characterised by a crystal matrix
- H01S3/164—Solid materials characterised by a crystal matrix garnet
- H01S3/1643—YAG
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1691—Solid materials characterised by additives / sensitisers / promoters as further dopants
- H01S3/1698—Solid materials characterised by additives / sensitisers / promoters as further dopants rare earth
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- 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
Abstract
The invention provides a human eye safety wave band Raman frequency shift laser device of LD side pumping, comprising a rear cavity mirror, an Nd YAG side pump assembly, an acousto-optic Q switch, a BaWO4 crystal and an output mirror which are sequentially arranged in a resonant cavity, wherein one side of the output mirror far away from the BaWO4 crystal is provided with a spectroscope which is obliquely arranged, the Nd YAG side pump assembly comprises an Nd YAG crystal rod positioned in the middle and an LD side pumping module arranged on the side surface of the Nd YAG crystal rod; YAG crystal rod, baWO4 crystal and acousto-optic Q switch crystal are all plated with anti-reflection films of 1319-1338nm and 1502-1527nm on the light-passing section; the rear cavity mirror is plated with high-reflection films of 1319-1338nm and 1502-1527 nm; the output mirror is coated with partially transmissive films of 1319-1338nm and 1502-1527 nm. According to the invention, 1319nm and 1338nm fundamental frequency light is used as a pumping source, and the 1.5 mu m-band human eye safety laser which is stably output under different repetition frequencies is obtained through inner cavity Raman frequency shift.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a human eye safety wave band Raman frequency shift laser device of LD side pumping.
Background
The laser research of the eye safety band has very important application value and is an important subject worthy of research. The wavelengths of 1.4-1.8 mu m are regarded as human eye safety wave bands, the threshold value of damage to human eyes is high, and the human eyes are relatively safe. The laser with the atmospheric penetration capability of 1.5-1.7 mu m has strong atmospheric penetration capability, and has important application in military aspects such as laser ranging, radar, photoelectric guidance and the like. In recent years, 1.5 mu m dual-wavelength laser has shown important application prospect in human eye safety differential absorption laser radar.
The dual-wavelength Raman laser of the human eye safety band of LD end-face pumping is studied in the early stage, however, the end-face pumping has the defects of small laser medium volume, poor pumping uniformity, higher quantum defects and the like, which restrict the further improvement of laser output power. In order to increase the output power, it is naturally conceivable to implement it with a higher power LD side pumping device. However, raman lasers with a fundamental frequency of 1.3 μm stimulated raman scattering shifted to 1.5 μm have only been reported for LD end-pumping devices, and no side pumping has been reported.
Currently, for the implementation of human eye safety laser, laser media doped with Er3+, cr4+ and Yb3+ can only generate laser with single wavelength. The eye-safe laser generated by the optical parametric oscillator needs phase matching and is relatively complex to adjust. And stimulated raman scattering is an efficient and easy way to design. Therefore, based on the important application value of the eye-safe band dual-wavelength laser, it is necessary to research the dual-wavelength raman laser of 1.3 μm to 1.5 μm of the high-power LD side pump.
Disclosure of Invention
The invention aims to provide a human eye safety wave band Raman frequency shift laser device of LD side pumping, which improves the energy density of 1.3 mu m fundamental frequency light in a cavity and realizes the Raman frequency conversion of 1.3 mu m to 1.5 mu m of LD side pumping.
The invention provides an eye-safe wave band Raman frequency shift laser device of LD side pumping, which comprises a rear cavity mirror, an Nd-YAG side pump assembly, an acousto-optic Q switch, a Raman medium and an output mirror which are sequentially arranged in a resonant cavity, wherein one side of the output mirror, which is far away from the Raman medium, is provided with a spectroscope which is obliquely arranged, and the Nd-YAG side pump assembly comprises an Nd-YAG crystal rod positioned in the middle and an LD side pump module arranged on the side surface of the Nd-YAG crystal rod.
Further, the resonant cavity is of a flat-flat cavity structure.
Further, the rear cavity mirror is plated with high-reflection films of 1319-1338nm and 1502-1527 nm.
Further, the spectroscope is plated with a high-reflection film of 1319-1338nm and a partially-transmission film of 1502nm and 1527 nm.
Further, 1064nm antireflection films are plated on the rear cavity mirror and the spectroscope.
Further, both sides of the acousto-optic Q switch in the light transmission direction are plated with anti-reflection films of 1319-1338nm and 1502-1527 nm.
Further, the light transmission sections of the Nd-YAG crystal rod and the Raman medium are respectively plated with an antireflection film of 1319-1338nm and 1502-1527 nm.
Further, the Raman medium is BaWO4 crystal, indium foil is coated on the outside of the Raman medium, and the Raman medium is placed in the copper block.
Further, a circulation pipeline is arranged outside the resonant cavity.
Further, the circulating pipeline is connected with a water cooling device.
The invention has compact structure, uses the side pumping of the Nd-YAG crystal rod, reduces the loss of 1.3 mu m fundamental frequency light and 1.5 mu m Raman light dual-wavelength laser by adjusting the cavity mirror, can enable 1319 and 1338nm spectral lines in the Nd-YAG crystal to oscillate simultaneously, reduces the pulse repetition frequency of the fundamental frequency, increases the single pulse peak power, improves the Raman conversion efficiency, improves the energy density of 1.3 mu m fundamental frequency light in the cavity, and realizes the Raman frequency conversion from 1.3 mu m to 1.5 mu m of the LD side pumping.
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 needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
reference numerals illustrate:
in the figure: the device comprises a 1-resonant cavity, a 2-rear cavity mirror, a 3-Nd YAG crystal rod, a 4-LD side pumping module, a 5-acousto-optic Q switch, a 6-BaWO4 crystal, a 7-output mirror and an 8-spectroscope;
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1:
a Raman frequency shift laser device of an LD side pumping eye safety wave band comprises a resonant cavity 1 with a flat-flat cavity structure, a rear cavity mirror 2, an Nd-YAG side pump assembly, an acousto-optic Q switch 5, a BaWO4 crystal 6 and an output mirror 7 are sequentially arranged in the resonant cavity 1 from left to right, a spectroscope 8 which is obliquely arranged is arranged on one side, far away from the BaWO4 crystal 6, of the output mirror 7, the Nd-YAG side pump assembly comprises an Nd-YAG crystal rod 3 in the middle and an LD side pumping module 4 coated outside the Nd-YAG crystal rod 3, and the LD side pumping module 4 is arranged on the side face of the Nd-YAG crystal rod 3.
The rear cavity mirror 2, the Nd-YAG side pump component, the acousto-optic Q switch 5, the BaWO4 crystal 6, the output mirror 7 and the spectroscope 8 are coaxially arranged.
The back cavity mirror 2 is plated with high-reflection films of 1319-1338nm (the reflectivity R is more than 99.996%) and 1502-1527nm (the reflectivity R is more than 99.998%), and the back cavity mirror 2 is plated with an antireflection film of 1064nm (the transmissivity T is more than 90%) so as to inhibit oscillation of a 1.06 mu m spectral line.
In the Nd-YAG side pump assembly, the light-transmitting section of the Nd-YAG crystal rod 3 is plated with antireflection films of 1319-1338nm and 1502-1527nm (the reflectivity R is less than 0.2%).
YAG side pumping module is used as fundamental frequency light pumping source, the maximum output power is 200W, the parameter of YAG crystal rod 3 is 1.0 at%, the diameter is 3mm, and the length is 65mm.
For the 1319nm and 1338nm lines in the Nd: YAG crystal rod 3, the laser emission cross section at 1338nm is slightly larger than at 1319nm, but at higher pump powers, the output power at 1319nm is somewhat larger than at 1338 nm.
The acousto-optic Q switch 5 is 46mm long, both sides of the light passing direction of the acousto-optic Q switch 5 are plated with antireflection films of 1319-1338nm and 1502-1527nm (the transmittance T is more than 99.8%), the center frequency of a driving source of the acousto-optic Q switch 5 is 27.12MHz, and the driving power is 50W.
In this example, baWO4 crystal 6 was used as a Raman medium, cut in the a-axis direction, and had a length of 47mm and a light transmission area of 5X 5mm 2 The light-transmitting sections of the BaWO4 crystals 6 are plated with antireflection films of 1319-1338nm and 1502-1527nm (the reflectivity R is smaller than 0.2%), the indium foil is coated on the outside of the BaWO4 crystals 6, and the BaWO4 crystals 6 are placed in copper blocks.
The spectroscope 8 is coated with a high-reflection film of 1319-1338nm (the reflectivity R is more than 99.9%) and a partial transmission film of 1502nm (the transmissivity T is 14%), 1527nm (the transmissivity T is 11%), the spectroscope 8 is coated with an antireflection film of 1064nm (the transmissivity T is more than 90%), and the transmissivity (T=0.09%) of the coating film of the spectroscope 8 at 1319nm is slightly larger than the transmissivity (T=0.03%) at 1338nm so as to balance the oscillation of fundamental frequency double wavelengths.
The outside of the resonant cavity 1 is provided with a circulating pipeline connected with water cooling equipment, and the circulating pipeline is filled with water to cool the laser, and the temperature is kept at 19 ℃.
In the device, an LD side pump module 4 is used as a side pump source to pump the side wall of a Nd YAG crystal rod 3, the Nd YAG crystal rod 3 absorbs pumping light energy to generate light waves, the light waves oscillate and amplify in a resonant cavity 1 to form oscillation light, and a high-reflection film on a rear cavity mirror 2 reflects the oscillation light with wavelengths of 1319-1338nm and 1502-1527nm to the Nd YAG side pump assembly; after reflection, the oscillation light with the wavelengths of 1319-1338nm and 1502-1527nm is almost transmitted through an antireflection film on the light-passing section in the YAG crystal rod 3 and is not easy to reflect; the transmitted oscillation light reaches the light-passing surface of the acousto-optic Q switch 5, and the oscillation light with the wavelengths of 1319-1338nm and 1502-1527nm is almost transmitted through the antireflection films on the two light-passing surfaces of the acousto-optic Q switch 5; the transmitted oscillation light reaching the light-passing section of the BaWO4 crystal 6 with the wavelengths of 1319-1338nm and 1502-1527nm is almost completely transmitted by an antireflection film on the light-passing section of the BaWO4 crystal 6, the reflectivity is less than 0.2%, and the oscillation light with the wavelengths of 1319-1338nm and 1502-1527nm is prevented from being reflected and oscillated; after transmission, the light reaches the spectroscope 8 through the output mirror 7, most of oscillation light with the wavelength of 1319-1338nm is reflected by the spectroscope 8 and can be emitted from the resonant cavity 1 through the spectroscope 8, and the oscillation light with the wavelengths of 1502nm and 1527 nm.
The invention has compact structure, uses the side pumping of the Nd-YAG crystal rod, reduces the loss of 1.3 mu m fundamental frequency light and 1.5 mu m Raman light dual-wavelength laser by adjusting the cavity mirror, can enable 1319 and 1338nm spectral lines in the Nd-YAG crystal to oscillate simultaneously, reduces the pulse repetition frequency of the fundamental frequency, increases the single pulse peak power, improves the Raman conversion efficiency, improves the energy density of 1.3 mu m fundamental frequency light in the cavity, and realizes the Raman frequency conversion from 1.3 mu m to 1.5 mu m of the LD side pumping.
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 (10)
1. An LD side-pumped eye-safe band raman shift laser device, characterized in that: the device comprises a rear cavity mirror, an Nd-YAG side pump assembly, an acousto-optic Q switch, a Raman medium and an output mirror which are sequentially arranged in a resonant cavity, wherein a spectroscope which is obliquely arranged is arranged on one side, away from the Raman medium, of the output mirror, and the Nd-YAG side pump assembly comprises an Nd-YAG crystal rod in the middle and an LD side pump module which is arranged on the side surface of the Nd-YAG crystal rod.
2. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the resonant cavity is of a flat-flat cavity structure.
3. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the back cavity mirror is plated with high reflection films of 1319-1338nm and 1502-1527 nm.
4. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the spectroscope is plated with a 1319-1338nm high-reflection film and 1502nm and 1527nm partial transmission films.
5. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the back cavity mirror and the spectroscope are plated with 1064nm antireflection films.
6. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the two sides of the acousto-optic Q switch in the light passing direction are plated with anti-reflection films of 1319-1338nm and 1502-1527 nm.
7. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: YAG crystal rods and light-transmitting sections of the Raman medium are plated with antireflection films of 1319-1338nm and 1502-1527 nm.
8. The LD side-pumped eye-safe band raman shift laser device of claim 1 wherein: the Raman medium is BaWO4 crystal, indium foil is coated on the outside of the Raman medium, and the Raman medium is placed in the copper block.
9. The LD side-pumped eye-safe band raman shift laser device of claim 8 wherein: and a circulating pipeline is arranged outside the resonant cavity.
10. The LD side-pumped eye-safe band raman shift laser device of claim 9 wherein: the circulating pipeline is connected with water cooling equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310100619.9A CN116247505A (en) | 2023-02-10 | 2023-02-10 | Eye-safe band Raman frequency-shift laser device of LD side pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310100619.9A CN116247505A (en) | 2023-02-10 | 2023-02-10 | Eye-safe band Raman frequency-shift laser device of LD side pump |
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| CN116247505A true CN116247505A (en) | 2023-06-09 |
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| CN202310100619.9A Pending CN116247505A (en) | 2023-02-10 | 2023-02-10 | Eye-safe band Raman frequency-shift laser device of LD side pump |
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