CN106229806B - The tunable alaxadrite laser of Raman yellow light pumping - Google Patents
The tunable alaxadrite laser of Raman yellow light pumping 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
- H01S3/09—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
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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
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Abstract
The present invention relates to all-solid state laser technical fields, to provide tunable alaxadrite laser, and it is low in cost, higher smooth light efficiency may be implemented.The technical solution adopted by the present invention is that, the tunable alaxadrite laser of Raman yellow light pumping, it include: laser diode, energy-transmission optic fibre, coupled lens group, cavity mirror, laser gain medium, Raman crystal, harmonic wave piece, frequency-doubling crystal, yellow light outgoing mirror, condenser lens, Chrysoberyl crystal, chrysoberyl laser total reflective mirror, tuned cell and chrysoberyl laser output mirror, laser diode issues the pump light in laser gain medium absorption band as pumping source, laser gain medium is pumped after energy-transmission optic fibre transmission and coupled lens group focus；Population inversion is formed in laser gain medium, as pump power increases, generates fundamental frequency light under the feedback effect for the resonant cavity that cavity mirror and yellow light outgoing mirror are constituted.Present invention is mainly applied to laser design and manufacture.
Description
Technical field
The present invention relates to the tunable chrysoberyl that all-solid state laser technical field more particularly to a kind of Raman yellow light pump
Laser.
Background technique
Chrysoberyl (Cr3+:BeAl2O4) it is a kind of laser material for being provided simultaneously with high power, broad tuning excellent properties, by
In its tunability, high-gain and superior temperature characterisitic, alaxadrite laser are widely paid attention to once occurring.Its base
This output spectrum range is in visible light near infrared band 700-850nm, can be widely used in space remote sensing, medical treatment, light
Storage, spectroscopy and the numerous research frontiers of nonlinear optics.
There are many method for pumping Chrysoberyl crystal, this is because chrysoberyl has very wide absorption band, in 400-
The absorbable pump light of 700nm.Currently used pump mode mainly has: 1, flash lamp pumping.Industrial processes and commercialization
Medical alaxadrite laser mostly uses flash lamp pumping mode, and the Technical comparing is mature, but undesirable causes to swash because it is absorbed
The transfer efficiency of light device entirety is lower, while the heat production of laser is also more serious.2,635/680nm feux rouges LD is pumped.Using
LD pumping Chrysoberyl crystal can greatly improve the whole efficiency of laser, and realize the miniaturization of laser, but at present
Powerful 635 and 680nmLD is not much and sees, greatly limits the output power of alaxadrite laser, and wave band LD
Price also costly.3, blue-green Laser pumps.Since the absorption band of chrysoberyl covers entire visible light wave range,
Therefore the crystal available now common 488nm argon ion laser, copper-vapor laser and 532nm green (light) laser etc. is visible
Light laser as pumping source, but the pump light under this pump mode and between output light there are larger quantum loss, make
The heat load for obtaining laser is more serious, to influence the output characteristics such as beam quality.
Summary of the invention
In order to overcome the deficiencies of the prior art, it is contemplated that chrysoberyl is presented centered on 590nm on the direction of E//b axis
Very strong width absorption peak, the present invention provides a kind of tunable chrysoberyl laser by the yellow light pumping near 590nm wavelength
Device.The present invention use the yellow light that is generated based on stimulated Raman scattering as tunable alaxadrite laser pumping source not only at
This is cheap, and due to the absorption peak that it can be directed at Chrysoberyl crystal, higher smooth light efficiency may be implemented.The present invention adopts
Technical solution is the tunable alaxadrite laser of Raman yellow light pumping, comprising: laser diode, energy-transmission optic fibre, coupling
It closes lens group, cavity mirror, laser gain medium, Raman crystal, harmonic wave piece, frequency-doubling crystal, yellow light outgoing mirror, focus thoroughly
Mirror, Chrysoberyl crystal, chrysoberyl laser total reflective mirror, tuned cell and chrysoberyl laser output mirror, laser diode are made
The pump light in laser gain medium absorption band is issued for pumping source, to sharp after energy-transmission optic fibre transmission and coupled lens group focus
Optical gain medium is pumped；Population inversion is formed in laser gain medium, as pump power increases, in resonance cavity reflection
Fundamental frequency light is generated under the feedback effect for the resonant cavity that mirror and yellow light outgoing mirror are constituted；The fundamental frequency light pass through Raman crystal when occur by
Swash Raman scattering effect, single order Stokes Raman light is generated after the intensity of fundamental frequency light is more than Raman threshold and in resonant cavity
Oscillation；Raman light generates yellow light under the action of frequency-doubling crystal, is exported by the reflection of harmonic wave piece via yellow light outgoing mirror；Yellow light
It is focused in Chrysoberyl crystal under the action of condenser lens, makes Chrysoberyl crystal that population inversion occur, in Jin Lvbao
Laser generation is formed in the resonant cavity that stone laser total reflective mirror and chrysoberyl laser output mirror are constituted, and in the effect of tuned cell
The lower tunable output for realizing optical maser wavelength.
The laser gain medium and the polishing of Raman crystal equal both ends, be coated with pump light that the laser diode issues and
The single order Stokes Raman light anti-reflection film that the fundamental frequency light and the Raman crystal that the gain media generates generate；If wherein swashing
Optical gain medium is from raman laser crystal, i.e., it is provided simultaneously with the attribute for generating fundamental frequency light and being carried out Raman frequency shift, then
Raman crystal is no longer set in the tunable alaxadrite laser of the Raman yellow light pumping.
The cavity mirror is concave mirror or flat mirror, and the pump light high transmittance film is plated on two sides, close to laser gain medium
One side plate the fundamental frequency light and the Raman light high-reflecting film；Fundamental frequency light and Raman light high transmittance film are plated in harmonic wave piece two sides, lean on
The one side of the nearly frequency-doubling crystal plates the yellow light high-reflecting film；Yellow light outgoing mirror is concave mirror or flat mirror, plates fundamental frequency light and Raman light
High-reflecting film plates yellow light high transmittance film.
The Chrysoberyl crystal both ends polishing, is coated with yellow light and 700-800nm high transmittance film, if the Chrysoberyl crystal
It is cut at Brewster angle, then is not necessarily to plated film.
The chrysoberyl laser total reflective mirror plates 700-800nm high-reflecting film；The chrysoberyl laser output mirror plates 700-
The part 800nm penetrates film.
In the alaxadrite laser further include: the fundamental frequency is plated on acousto-optic Q modulation crystal, acousto-optic Q modulation crystal two sides
Light and the Raman spectra permeable membrane operate for realizing the pulse of the fundamental frequency light, improve peak power to improve Raman Process
With the nonlinear conversion efficiency of frequency multiplication process.
The features of the present invention and beneficial effect are:
The present invention is not only low in cost as the pumping source of tunable alaxadrite laser using Raman yellow light, Er Qieyou
In the absorption peak that it can be directed at Chrysoberyl crystal, higher smooth light efficiency may be implemented, while pump light and output light
Excited state is also smaller, can be improved the output performance of alaxadrite laser, meets a variety of needs in practical application.
Detailed description of the invention:
Fig. 1 is a kind of structure of the tunable alaxadrite laser for Raman yellow light pumping that the embodiment of the present invention 1 provides
Schematic diagram.
In attached drawing, parts list represented by the reference numerals are as follows:
1: laser diode；2: energy-transmission optic fibre；
3: coupled lens group；4: cavity mirror；
5: laser gain medium；6: Raman crystal；
7: acousto-optic Q modulation crystal；8: harmonic wave piece；
9: frequency-doubling crystal；10: yellow light outgoing mirror；
11: condenser lens；12: the first chrysoberyl laser total reflective mirrors；
13: Chrysoberyl crystal；14: the second chrysoberyl laser total reflective mirrors；
15: third chrysoberyl laser total reflective mirror；16: chrysoberyl laser output mirror
17: tuned cell.
Fig. 2 is a kind of structure of the tunable alaxadrite laser for Raman yellow light pumping that the embodiment of the present invention 2 provides
Schematic diagram.
In attached drawing, 18: yellow light feedback mirrors.
Specific embodiment
In view of chrysoberyl is on the direction of E//b axis, very strong wide absorption peak, the present invention are presented centered on 590nm
Provide a kind of tunable alaxadrite laser by the yellow light pumping near 590nm wavelength.The present invention, which uses, to be based on being excited
The yellow light that Raman scattering generates is not only low in cost as the pumping source of tunable alaxadrite laser, but also since it can
It is directed at the absorption peak of Chrysoberyl crystal, higher smooth light efficiency may be implemented.It is described below:
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
Ground detailed description.
Embodiment 1
Chrysoberyl (Cr3+:BeAl2O4) crystal be a kind of function admirable laser material, ground to its absorption spectrum
Study carefully middle discovery, biggish absorption cross-section is all had in yellow band on three major axes orientations of the crystal, especially in E//b axis
Direction on, very strong wide absorption peak is presented centered on 590nm.Therefore, optical pumping or unpolarized optical pumping are either polarized
Pu can realize fully absorbing for pump light using yellow light pumping Chrysoberyl crystal.Alaxadrite laser as compared with the past
Pump mode, propose use pumping source of the Raman yellow light as tunable alaxadrite laser, it is not only low in cost, but also
Since it can be directed at the absorption peak of Chrysoberyl crystal, higher smooth light efficiency, while pump light and output light may be implemented
Excited state it is also smaller, can be improved the output performance of alaxadrite laser, meet a variety of needs in practical application.
The embodiment of the present invention 1 provides a kind of tunable alaxadrite laser structure of Raman yellow light pumping, such as Fig. 1 institute
Show.
808nm or 880nm laser diode pumping source 1 issues pump light, through the transmission of energy-transmission optic fibre 2 and coupled lens group 3
Laser gain medium 5 is pumped after focusing；Laser gain medium 5 use Nd:YAG crystal, crystalline size be 3 × 3 ×
10mm3, doping concentration selection 0.5at.%；Raman crystal 6 selects the GdVO of a cutting4Crystal, crystalline size be 3 × 3 ×
10mm3；Laser gain medium 5 and the polishing of the equal both ends of Raman crystal 6, plate 1064nm fundamental frequency light and 1174nm single order Stokes is drawn
Graceful smooth anti-reflection film, is placed in heat sink with indium sheet package respectively, controls operating temperature using cooling circulating water system.Resonance cavity reflection
Mirror 4 is flat mirror, two-sided plating 808nm or 880nm high transmittance film, and the one side close to laser gain medium 5 plates 1064nm and 1174nm high
Anti- film；Harmonic wave piece 8 is flat mirror, two-sided plating 1064nm and 1174nm anti-reflection film, and the one side plating 587nm high close to frequency-doubling crystal 9 is anti-
Film；For frequency-doubling crystal 9 using the ktp crystal of II type-Ⅱphase matching, crystalline size is 3 × 3 × 15mm3, heat is placed in indium sheet package
In heavy, operating temperature is controlled using cooling circulating water system；It is the concave mirror of 100mm, plating that yellow light outgoing mirror 10, which selects radius of curvature,
1064nm and 1174nm high-reflecting film, 587nm high transmittance film；
Laser gain medium 5 absorbs 808nm or 880nm pump light and forms population inversion, in cavity mirror 4 and Huang
1064nm fundamental frequency light is generated under the feedback effect for the resonant cavity that light output mirror 10 is constituted；1064nm fundamental frequency light passes through Raman crystal 7
The effect of Shi Fasheng stimulated Raman scattering, generation wavelength is the one of 1174nm after the intensity of 1064nm fundamental frequency light is more than Raman threshold
Rank Stokes Raman light；The 1174nm Raman light vibrated in resonant cavity generates 587nm Huang under the action of frequency-doubling crystal 9
Light is exported by the reflection of harmonic wave piece 8 via yellow light outgoing mirror 10；The effect of acousto-optic Q modulation crystal 6 is by improving peak power
To improve the nonlinear conversion efficiency of Raman Process and frequency multiplication process；
The focal length of condenser lens 11 is 100mm, and the 587nm yellow light that yellow light outgoing mirror 10 exports is focused on chrysoberyl crystalline substance
It is pumped in body 13；For Chrysoberyl crystal 13 with cut at Brewster angle, crystalline size is 4 × 4 × 15mm3, absorb 587nm
Population inversion occurs after yellow light, as pump energy increases, gain is greater than loss, to generate spontaneous radiated photons；Jin Lv
Jewel resonant cavity uses four mirror annular lumen type, the first chrysoberyl laser total reflective mirror 12 and the second chrysoberyl laser total reflective mirror 14
It is the concave mirror of 100mm using radius of curvature, 700-800nm high-reflecting film is plated in concave surface, and the angle of two mirrors is 15 °；The green treasured of third gold
Stone laser total reflective mirror 15 is flat mirror, plates 700-800nm high-reflecting film on one side；Chrysoberyl laser output mirror 16 is flat mirror, is plated on one side
The part 700-800nm penetrates film, transmitance 10%；It is respectively the two-fold of 5mm and 10mm that tuned cell 17, which selects two panels thickness,
Filter plate (BRF) is penetrated, the tunable output of chrysoberyl laser is realized by rotation BRF；What Chrysoberyl crystal 13 generated
Spontaneous radiation photon is in the first chrysoberyl laser total reflective mirror 12, the second chrysoberyl laser total reflective mirror 14, third chrysoberyl
Stable laser generation is formed in the four mirror ring resonators that laser total reflective mirror 15 and chrysoberyl laser output mirror 16 are constituted, is passed through
It is exported by chrysoberyl laser output mirror 16.
In the above-described embodiments, laser gain medium can be Nd:YLF, the crystal such as Nd:YALO；Raman crystal can be
Ba(NO3)2, NaBrO3, CaWO4, LiIO3Equal crystal；Frequency-doubling crystal can be LBO, LiIO3Equal crystal can also be faced using non-
Boundary's phase matched mode realizes frequency multiplication.When specific implementation, the embodiment of the present invention is without limitation.
In the above-described embodiments, when the collocation of laser gain medium, Raman crystal and frequency-doubling crystal is different, each crystal
Cutting angle also can be different, while the wavelength of fundamental frequency light, Raman light and yellow light also can be different, cavity mirror, harmonic wave piece and
Yellow light outgoing mirror and each crystal coating should also make corresponding change, and specific wavelength can be found in the literature, and the present invention is herein not
It repeats again.
Embodiment 2
Laser gain medium in the embodiment of the present invention 2 uses self-raman crystal, therefore can be omitted Raman in a device
Crystal, while tuned cell of the dispersing prism as alaxadrite laser is selected, concrete structure schematic diagram is as shown in Figure 2.
808nm or 880nm laser diode pumping source 1 issues pump light, through the transmission of energy-transmission optic fibre 2 and coupled lens group 3
Laser gain medium 5 is pumped after focusing；The Nd:YVO that laser gain medium 5 is cut using a4Crystal, crystalline size 3
×3×10mm3, doping concentration selection 0.3at.%；The polishing of 5 both ends of laser gain medium, plates 1064nm fundamental frequency light and 1176nm
Single order Stokes Raman light anti-reflection film, is placed in heat sink with indium sheet package, controls operating temperature using cooling circulating water system.
Cavity mirror 4 is flat mirror, two-sided plating 808nm or 880nm high transmittance film, and the one side close to laser gain medium 5 plates 1064nm
With 1176nm high-reflecting film；Harmonic wave piece 7 is flat mirror, two-sided plating 1064nm and 1176nm anti-reflection film, and the one side close to frequency-doubling crystal 8 is plated
588nm high-reflecting film；For frequency-doubling crystal 8 using the lbo crystal of I type-Ⅱphase matching, crystalline size is 3 × 3 × 15mm3, with indium sheet packet
It wraps up in and is placed in heat sink, operating temperature is controlled using cooling circulating water system；It is 100mm's that yellow light outgoing mirror 9, which selects radius of curvature,
Concave mirror plates 1064nm and 1176nm high-reflecting film, 588nm high transmittance film；
Laser gain medium 5 absorbs 808nm or 880nm pump light and forms population inversion, in cavity mirror 4 and Huang
1064nm fundamental frequency light is generated under the feedback effect for the resonant cavity that light output mirror 9 is constituted；Laser gain medium 5 is that Raman is situated between again simultaneously
Matter, when 1064nm fundamental frequency light intensity be more than Raman threshold after be generation wavelength for 1176nm single order Stokes Raman light；
The 1176nm Raman light vibrated in resonant cavity generates 588nm yellow light under the action of frequency-doubling crystal 9, passes through the anti-of harmonic wave piece 8
It penetrates and is exported via yellow light outgoing mirror 10；The effect of acousto-optic Q modulation crystal 6 be by improve peak power come improve Raman Process and times
The nonlinear conversion efficiency of frequency process；
The focal length of condenser lens 11 is 100mm, and the 588nm yellow light that yellow light outgoing mirror 10 exports is focused on chrysoberyl crystalline substance
It is pumped in body 13；13 both ends of the Chrysoberyl crystal polishing of a cutting, plates 700-800nm anti-reflection film, and crystalline size is 3 × 3
×15mm3, population inversion occurs after absorbing 588nm yellow light, as pump energy increases, gain is greater than loss, to generate
Spontaneous radiation photon, and the chrysoberyl laser constituted in chrysoberyl laser total reflective mirror 12 and chrysoberyl laser output mirror 16
Stable laser generation is formed under the action of resonant cavity；Tuned cell 17 is the K9 glass equilateral prism that 3 pieces of side lengths are 10mm, gold
Emerald laser line width under the action of dispersing prism is narrowed, by rotating the angle of chrysoberyl laser total reflective mirror 12 come real
Existing wavelength tuning, finally exports via chrysoberyl laser output mirror 16；Yellow light feedback mirrors 18 are flat mirror, brilliant close to chrysoberyl
The one side of body 13 plates 588nm high-reflecting film, will after Chrysoberyl crystal 13 unabsorbed 588nm yellow light reflection again by
Chrysoberyl crystal 13, to improve absorption of the Chrysoberyl crystal 13 to 588nm yellow light.
In the above-described embodiments, laser gain medium can also be Nd:GdVO4, Nd:LuVO4, Nd:KGW etc. from Raman swash
Optical medium, respectively corresponds corresponding fundamental frequency light, Raman light and yellow wavelengths, and when specific implementation, the embodiment of the present invention does not do this
Limitation.
In the above-described embodiments, laser gain medium, Raman crystal and chrysoberyl can be selected brilliant according to actual needs
Doping concentration or size and cavity mirror, the radius of curvature of yellow light outgoing mirror and chrysoberyl laser output mirror of body
And transmitance, it can also be by the way of profile pump, when specific implementation, the embodiment of the present invention is without limitation.
In the above-described embodiments, Raman yellow light resonant cavity can also be designed to fold cavity configuration, to control frequency-doubling crystal
In spot radius, to realize higher shg efficiency, the embodiment of the present invention is without limitation.
In the above-described embodiments, it can be one as the birefringent filter of tuned cell or dispersing prism to be also possible to
Multiple to be used cooperatively, tuned cell is also possible to grating, and optical-unidirectional device can also be added in chrysoberyl laser resonator
With etalon to realize that single-frequency exports, when specific implementation, the embodiment of the present invention is without limitation.
The embodiment of the present invention to the model of each device in addition to doing specified otherwise, the model of other devices with no restrictions,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of tunable alaxadrite laser of Raman yellow light pumping, characterized in that include: laser diode, pass energy light
Fibre, coupled lens group, cavity mirror, laser gain medium, Raman crystal, harmonic wave piece, frequency-doubling crystal, yellow light outgoing mirror,
Condenser lens, Chrysoberyl crystal, chrysoberyl laser total reflective mirror, tuned cell and chrysoberyl laser output mirror, laser two
Pole pipe issues the pump light in laser gain medium absorption band as pumping source, focuses through energy-transmission optic fibre transmission and coupled lens group
Laser gain medium is pumped afterwards；Population inversion is formed in laser gain medium, as pump power increases, in resonance
Fundamental frequency light is generated under the feedback effect for the resonant cavity that resonant reflec-tors and yellow light outgoing mirror are constituted；When the fundamental frequency light passes through Raman crystal
Stimulated Raman scattering effect occurs, single order Stokes Raman light is generated after the intensity of fundamental frequency light is more than Raman threshold and humorous
It shakes intracavitary oscillation；Single order Stokes Raman light generates yellow light under the action of frequency-doubling crystal, by the reflection of harmonic wave piece via
The output of yellow light outgoing mirror；Yellow light focuses in Chrysoberyl crystal under the action of condenser lens, makes Chrysoberyl crystal
Population inversion forms laser vibration in the resonant cavity that chrysoberyl laser total reflective mirror and chrysoberyl laser output mirror are constituted
It swings, and realizes the tunable output of optical maser wavelength under the action of tuned cell.
2. the tunable alaxadrite laser of Raman yellow light pumping as described in claim 1, characterized in that the laser increases
Beneficial medium and the equal both ends polishing of Raman crystal, what the pump light and the gain media for being coated with the laser diode sending generated
The single order Stokes Raman light anti-reflection film that fundamental frequency light and the Raman crystal generate；If wherein laser gain medium is from Raman
Laser crystal, i.e., it, which is provided simultaneously with, generates fundamental frequency light and is carried out the attribute of Raman frequency shift, then the Raman yellow light pumps
Raman crystal is no longer set in tunable alaxadrite laser.
3. the tunable alaxadrite laser of Raman yellow light pumping as described in claim 1, characterized in that the resonant cavity
Reflecting mirror is concave mirror or flat mirror, and the pump light high transmittance film is plated on two sides, and the one side close to laser gain medium plates the fundamental frequency light
And the single order Stokes Raman light high-reflecting film；Fundamental frequency light is plated on harmonic wave piece two sides and single order Stokes Raman light is high thoroughly
Film, the one side close to the frequency-doubling crystal plate the yellow light high-reflecting film；Yellow light outgoing mirror is concave mirror or flat mirror, plates fundamental frequency light and one
Rank Stokes Raman light high-reflecting film plates yellow light high transmittance film.
4. the tunable alaxadrite laser of Raman yellow light pumping as described in claim 1, characterized in that the green treasured of gold
The polishing of stone crystal both ends, is coated with yellow light and wavelength 700-800nm high transmittance film, if the Chrysoberyl crystal is that Brewster's angle is cut
It cuts, is then not necessarily to plated film.
5. the tunable alaxadrite laser of Raman yellow light pumping as described in claim 1, characterized in that the green treasured of gold
Stone laser total reflective mirror plates wavelength 700-800nm high-reflecting film；The chrysoberyl laser output mirror plating part wavelength 700-800nm is saturating
Cross film.
6. the tunable alaxadrite laser of Raman yellow light pumping as described in claim 1, characterized in that the green treasured of gold
In stone laser further include: the acousto-optic Q modulation crystal between laser gain medium and Raman crystal, the acousto-optic Q modulation crystal
The fundamental frequency light and the single order Stokes Raman light anti-reflection film are plated in two sides, operate for realizing the pulse of the fundamental frequency light,
Peak power is improved to improve the nonlinear conversion efficiency of Raman Process and frequency multiplication process.
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| CN112886377A (en) * | 2019-11-29 | 2021-06-01 | 山东大学 | Emerald gemstone continuous tunable laser pumped by 590nm waveband Raman frequency doubling light source |
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| CN114122880B (en) * | 2021-11-22 | 2023-06-30 | 西北大学 | Wavelength tunable single-frequency yellow-green laser |
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