CN106451051B - 2 μm of tunable laser of standing-wave cavity optical parametric oscillator are constituted based on body grating - Google Patents
2 μm of tunable laser of standing-wave cavity optical parametric oscillator are constituted based on body grating Download PDFInfo
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- CN106451051B CN106451051B CN201610945689.4A CN201610945689A CN106451051B CN 106451051 B CN106451051 B CN 106451051B CN 201610945689 A CN201610945689 A CN 201610945689A CN 106451051 B CN106451051 B CN 106451051B
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
- H01S3/1003—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors tunable optical elements, e.g. acousto-optic filters, tunable gratings
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
Abstract
2 μm of tunable laser of standing-wave cavity optical parametric oscillator, including 1 μm of laser and standing-wave cavity optical parametric oscillator are constituted based on body grating；The standing-wave cavity optical parametric oscillator includes the first plane mirror, nonlinear crystal, body grating and reflection unit；First plane mirror with high-transmission rate and has high reflectance to 2 μm of laser to 1 μm of laser；The position of 1 μm of laser beam waist is arranged in the nonlinear crystal；2 μm of laser are reflected in the body grating fractional transmission and part；The laser that 1 μm of laser issues successively vibrates between first plane mirror, nonlinear crystal, body grating and reflection unit back and forth after entering the standing-wave cavity optical parametric oscillator, finally divides two-way to export from the body grating；Angle between the body grating and the laser for entering the body grating and the angular compliance between the reflection unit, the output laser that generation wavelength is tunable.The exportable high light beam quality of 2 μm of tunable laser of the invention, relatively high power, narrow linewidth and tunable wave length 2 μm of laser.
Description
Technical field
The present invention relates to laser technology fields, more particularly to a kind of body grating that is based on to constitute standing-wave cavity optical parametric oscillator
2 μm of tunable laser.
Background technique
2 μm of laser sources militarily have an important application value, and it be pumping phosphorus germanium zinc optical parametric oscillator (OPO,
Optical Parametric Oscillator) generate mid-infrared laser (3-5 μm of laser) perfect light source.Further, it is curing
Fields, 2 μm of laser sources such as treatment, remote sensing and material science also have huge potentiality.Therefore, 2 μm of laser sources are always domestic and international
The hot spot of research.
Currently, there are mainly three types of the methods of 2 μm of laser of generation: 1) using 2 μm of the solid state laser generation mixed Tm or mix Ho
Laser；2) Tm optical fiber laser 2 μm of laser of generation are mixed in use；3) using 1 μm of solid state laser of rubidium is mixed, pump KTP OPO or
1 μm of laser is converted into 2 μm of laser by PPLN OPO etc..The technology not yet ten of 2 μm of laser is directly generated for first two laser
It is divided into ripe, equipment valuableness, higher cost.And the third generates the structure of 2 μm of laser using 1 μm of solid state laser pumping OPO
Simply, technology maturation, lower cost, and higher power output can be generated, therefore it is using relatively broad.
Optical parametric oscillator (OPO) technology is a kind of technology that can generate broadband continuously adjustable laser, is utilized
Three couple waves occur for the second order nonlinear effect of nonlinear crystal, the pump light propagated in nonlinear crystal and two parameteric lights
Interaction, to realize that light energy is converted into two low frequency parameteric lights from high frequency pump light, is highly suitable for generating red
It is outer and in, the laser of far infrared band.Service life polarized crystal meets e → e+e as nonlinear crystal, matching way,
The 2 μm of signal lights and ideler frequency light generated can all pump phosphorus germanium zinc optical parametric oscillator, obtain extreme efficiency.In order to
Using maximum nonlinear factor, walk-off effect is overcome, improve transfer efficiency, obtain high-power output, it is general using periodical pole
Change lithium niobate (PPLN), periodic polarized phosphoric acid fluorine titanium potassium (PPKTP) and periodic polarized lithium tantalate (PPLT) to be used as periodically
Polarized crystal.But 2 based on the output of the ordinary optical parametric oscillator of PPLN, PPKTP and PPLT quasi-periodic polarized crystal
The line width of μm laser is all very wide, and generally more than 60nm has exceeded the reception line less than 7nm of phosphorus germanium zinc optical parametric oscillator
It is wide.Therefore, it in order to improve the transfer efficiency of mid-infrared laser, needs further to carry out line widths to 2 μm of laser sources to narrow.
External cavity type or intracavity can be used using the structure that optical parametric oscillator generates the laser of 2 μm of laser, outside
Cavity structure refers to that the outside of 1 μm of laser is arranged in optical parametric oscillator, and intracavity structure refers to optical parametric oscillator
The inside of 1 μm of laser is set.In interior cavity structure, for the transfer efficiency for reducing threshold value, improving pump light, make to pump
Laser passes through nonlinear crystal back and forth, and outgoing mirror usually reflects pumping laser, and light echo, which is got on pump laser, will affect pump
The service life of Pu laser.
In addition, beam quality factor is the assessment and Elementary Theory of Control of laser beam quality, it is defined as
Wherein, R is the waist radius of actual light beam, R0For the waist radius of basement membrane Gaussian beam, θ is the remote of actual light beam
The field angle of divergence, θ0For the far-field divergence angle of basement membrane Gaussian beam.When beam quality is 1, there is best beam quality.At present by
There are also larger gaps for the beam quality and ideal situation that optical parametric oscillator generates 2 μm of laser, still fail to fully meet at present
The needs of application.
All in all, the beam quality obtained currently based on optical parametric oscillator technology is not good enough, and output power is inadequate
Height, and wavelength tuning range is also smaller.
Summary of the invention
It is an object of the invention to overcome shortcoming and deficiency in the prior art, provide a kind of high efficiency, high light beam quality,
2 μm of lasers of line width and tunable wave length.
The present invention is achieved by the following technical solutions: 2 μ of standing-wave cavity optical parametric oscillator are constituted based on body grating
M tunable laser, including 1 μm of laser and standing-wave cavity optical parametric oscillator；The standing-wave cavity optical parametric oscillator packet
Include the first plane mirror, nonlinear crystal, body grating and reflection unit；First plane mirror has high-transmission rate to 1 μm of laser
And there is high reflectance to 2 μm of laser；The position of 1 μm of laser beam waist is arranged in the nonlinear crystal；The body grating portion
Transmission and part is divided to reflect 2 μm of laser；After the laser that 1 μm of laser issues enters the standing-wave cavity optical parametric oscillator
It is successively vibrated back and forth between first plane mirror, nonlinear crystal, body grating and reflection unit, finally from the body grating
Divide two-way output；The body grating and enter the body grating laser between angle and between the reflection unit
Angular compliance, the output laser that generation wavelength is tunable.
Compared with the existing technology, the exportable high light beam quality of 2 μm of tunable laser, relatively high power and narrow line of the invention
2 μm of wide laser, and using standing wave cavity configuration design, cooperation tuning body grating and enter body grating laser between angle with
And the angle between reflection unit, it vibrates laser back and forth in intracavitary holding, the tune of 2 μm of environs wavelength may be implemented
It is humorous.
Further, the reflection unit is a flat surface mirror, and the plane mirror has high reflectance to 2 μm of laser, from described
Plane mirror described in the laser vertical incidence that body grating diffraction comes out, then the body grating is reflected back along former road by the plane mirror.
Further, 2 μm of tunable laser further include a spectroscope, and the spectroscope is set to the standing-wave cavity optics
Parametric oscillator rear end, to 1 μm of laser with high reflectance and to 2 μm of laser with high-transmission rate.The spectroscope was used for
Remaining 1 μm of laser is filtered, 2 μm of pure laser are exported.
Further, 2 μm of tunable laser further include a concave mirror, and the concave mirror is set to described stay
Wave chamber optical parametric oscillator rear end has high reflectance to 1 μm of laser and 2 μm of laser, wherein from body grating output
Concave mirror described in laser vertical incidence all the way, then the body grating is reflected back along former road by the concave mirror.
Further, 2 μm of tunable laser further include an isolator, and the isolator is set to 1 μm of laser
Between the standing-wave cavity optical parametric oscillator.The isolator is used to prevent the 1 μm of laser returned to laser and light
The adverse effect that road system generates.
Further, the isolator includes the first half-wave plate, beam-dividing cube, 45 ° of Faraday rotators and the second half-wave
Piece, the laser that 1 μm of laser issues pass sequentially through first half-wave plate, beam-dividing cube, 45 ° of Faraday rotators and
Second half-wave plate.
Further, 2 μm of tunable laser further include a positive lens, and the positive lens is set to the isolator and institute
It states between standing-wave cavity optical parametric oscillator, there is high-transmission rate to 1 μm of laser.The 1 μm of laser warp exported from the isolator
The positive lens is crossed to focus.
Further, the body grating is 30% to the transmissivity of 2 μm of laser, reflectivity 70%.
In order to better understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Detailed description of the invention
Fig. 1 is the reality of 2 μm of tunable laser of the invention that standing-wave cavity optical parametric oscillator is constituted based on body grating
Apply the structural schematic diagram of example 1.
Fig. 2 is the beam radius distribution map in standing-wave cavity optical parametric oscillator shown in Fig. 1 400.
Fig. 3 is the laser beam quality measuring figure of the output of 2 μm of tunable laser shown in Fig. 1.
Fig. 4 is the reality of 2 μm of tunable laser of the invention that standing-wave cavity optical parametric oscillator is constituted based on body grating
Apply the structural schematic diagram of example 2.
Specific embodiment
The present invention designs special standing wave cavity configuration, is narrowed using body grating as line width and wavelength tuning element, passes through body
The optical maser wavelength of grating meets Bragg condition: 2n Λ cos θ=λ, n are refractive index, and Λ is the body grating period, and λ is diffracted laser
Wavelength.Body grating is to different incident lasers, and under different incidence angles, only the laser of single wavelength can be from body grating
It is come out by specific direction diffraction.By the angle tuning between body grating and incident laser, the wavelength tune to output laser is realized
It is humorous.
Hereinafter, being described in detail by specific embodiment.
Embodiment 1
Referring to Fig. 1, it is 2 μm based on body grating composition standing-wave cavity optical parametric oscillator of the invention tunable sharp
The structural schematic diagram of the embodiment 1 of light device, including be arranged successively along optical path direction of advance 1 μm of laser 100, isolator 200,
Positive lens 300, standing-wave cavity optical parametric oscillator 400 and spectroscope 500.
Specifically, in the present embodiment, 1 μm of laser 100 is Nd:YVO4Laser exports 1 μm of arteries and veins of linear polarization
Impulse light, the Nd:YVO4The repetition rate of laser is 20KHz, and output mean power is 6.8W.
The isolator 200 includes 220,45 ° of the first half-wave plate 210, beam-dividing cube Faraday rotators 230 and second
Half-wave plate 240.By 1 μm of laser that 1 μm of laser 100 exports unidirectional can only pass sequentially through the first half-wave plate 210, beam splitting is stood
220,45 ° of Faraday rotators 230 of cube and the second half-wave plate 240, then export to positive lens 300.The isolator 200 is used
In the adverse effect for preventing the 1 μm of laser returned from generating to laser and light path system.
The focal length of the positive lens 300 is 150mm, has high-transmission rate to 1 μm of laser.1 μm exported from isolator 200
Laser is after the focusing of positive lens 300, into standing-wave cavity optical parametric oscillator 400.
The standing-wave cavity optical parametric oscillator 400 includes the first plane mirror 410, nonlinear crystal 420, body grating 430
And reflection unit.In the present embodiment, which is the second plane mirror 440.The 1 μm of laser focused by positive lens 300
Into in the standing-wave cavity optical parametric oscillator 400, successively in the first plane mirror 410, nonlinear crystal 420,430 and of body grating
It vibrates between second plane mirror 440, and constantly amplifies at nonlinear crystal 420 back and forth, finally divide two-way from body grating 430
Output.
First plane mirror 410 with high-transmission rate and has high reflectance to 2 μm of laser to 1 μm of laser.By just
1 μm of first plane mirror of laser vertical incidence 410 that lens 300 focus.
The position of 1 μm of laser beam waist is arranged in the nonlinear crystal 420.In the present embodiment, nonlinear crystal 420
For the periodic polarized lithium columbate crystal for mixing magnesia.The 1 μm of laser transmitted from the first plane mirror 410 enters non-linear crystalline substance
Body 420, due to nonlinear effect, has portion of energy to be transformed into 2 μm when 1 μm of power is sufficiently high.
2 μm of laser are reflected in 430 fractional transmission of body grating and part.In the present embodiment, body grating 430 swashs 2 μm
The transmissivity of light is 30%, reflectivity 70%.Enter body grating 430 by 2 μm of laser that nonlinear crystal 420 amplifies, leads to
The angle between body grating 430 and the laser for entering body grating 430 is overregulated, the laser come out from 430 diffraction of body grating is tuned
Wavelength.
Second plane mirror 440 has high reflectance to 2 μm of laser, and the laser come out from 430 diffraction of body grating reaches
Second plane mirror 440, when the angle between body grating 430 and the laser of entrance body grating 430 changes, from body grating
The laser direction that 430 diffraction come out can also change, and cooperation adjusts the angle of the second plane mirror 440, make to spread out from body grating 430
The second plane mirror of laser vertical incidence 440 shot out, then body grating 430 is reflected back along former road by the second plane mirror 440, then by
Body grating 430 is reflected back nonlinear crystal 420, and holding is vibrated back and forth.
The spectroscope 500 with high reflectance and has high-transmission rate to 2 μm of laser to 1 μm of laser.In the present embodiment
In, the laser of the wherein curb original incident direction exported from body grating 430 passes through spectroscope 500, and spectroscope 500 is for filtering
Remaining 1 μm of laser exports 2 μm of pure laser.
The working principle of 2 μm of tunable laser of the invention described further below: it when 1 μm of laser 100 is opened, produces
1 μm of raw laser passes sequentially through 220,45 ° of the first half-wave plate 210, beam splitting cube Faraday rotators 230 in isolator 200
With the second half-wave plate 240, then focus by positive lens 300 into standing-wave cavity optical parametric oscillator 400, when 1 μm of power foot
When enough high, due to nonlinear effect, there is portion of energy to be transformed into 2 μm.2 μm of laser are successively in the first plane mirror 410, non-thread
It vibrates between property crystal 420, body grating 430 and the second plane mirror 440, and constantly amplifies at nonlinear crystal 420 back and forth,
2 μm of part laser transmits output from body grating 430.According to Bragg condition 2n Λ cos θ=λ, body grating 430 is for difference
Incident light wave, only unique wavelength can the reflected light coherent enhancement of different grating planars formed the order of diffraction, Cai Nengcong
Diffraction comes out in a specified direction in body grating 430, and the light of its commplementary wave length is unsatisfactory for Bragg condition, is merely able to transmitted through body
Grating 430.2 μm of laser are when transmiting body grating 430, using body grating 430 to the selection index system of wavelength, only very narrow linewidth
2 μm of laser form standing-wave cavity, and then obtained narrow linewidth 2 μm of laser output.Further, body grating 430 with enter body
Adjustable angle between the laser of grating 430 is humorous, and corresponding different incident angle, the wavelength of diffraction also can be different, according to this
Point adjusts the angle of the second plane mirror 440 by adjusting the angle between body grating 430 and the laser for entering body grating 430, cooperation
Degree guarantees the second plane mirror of laser vertical incidence 440 come out from 430 diffraction of body grating, then by the second plane mirror 440 along former road
It is reflected back body grating 430, then nonlinear crystal 420 is reflected back by body grating 430, holding is vibrated back and forth, is swashed to realize to 2 μm
The output wavelength of light tunes.
In the present embodiment, when laser normal incidence body grating 430, the rotation angle of body grating 430 is 0 °, is not made at this time
With the second plane mirror 440, central wavelength is 2129.6nm when 430 normal incidence of body grating, that is, exports 2 μm of laser and adjust with corresponding
430 angle change relationship of body grating are as follows: λout=2129.6 × cos θ.In experiment 430 angle tuning range of body grating be 0~
30 °, the laser tuning of 2 μm of laser wave bands from 1850nm to 2510nm may be implemented, continuing increase angle of regulation range can be real
Existing larger range of wavelength tuning.Last laser divides two-way to export from body grating 430, a curb original incident laser direction, all the way
Along the laser direction reflected through the second plane mirror 440.
In order to which 2 μm of laser for exporting 2 μm of tunable laser of the invention obtain high power and greater efficiency, standing wave
Chamber optical parametric oscillator 400 uses structure as compact as possible, and corresponding beam distribution is referring to Fig. 2, it is stayed shown in Fig. 1
Beam radius distribution map in wave chamber optical parametric oscillator 400.2 μm of output laser-qualities in such cases referring to Fig. 3,
It is the laser beam quality measuring figure of the output of 2 μm of tunable laser shown in Fig. 1, it can be seen that the output laser exists
The beam quality factor of horizontal direction and vertical direction is respectively 3.4 and 3.5.
Embodiment 2
Referring to Fig. 4, it is 2 μm based on body grating composition standing-wave cavity optical parametric oscillator of the invention tunable sharp
The structural schematic diagram of the embodiment 2 of light device.The present embodiment is the difference from embodiment 1 is that the spectroscope 500 in embodiment 1 is replaced
It is changed to concave mirror 600.The concave mirror 600 has high reflectance to 1 μm of laser and 2 μm of laser, in the present embodiment
In, the laser vertical incidence concave mirror 600 of the wherein curb original incident direction exported from body grating 430, then by concave surface
Reflecting mirror 600 is reflected back body grating 430 along former road.
Compared to embodiment 1, the present embodiment using concave mirror 600 by 1 μm of laser reflection return nonlinear crystal 420 into
The secondary pumping of row, and by wherein export all the way 2 μm of laser reflections return it is intracavitary compensate, reduce the diffraction damage of 2 μm of laser generations
Consumption improves the transfer efficiency of 2 μm of laser, and only 2 μm of laser output all the way, and 430 adjustable-angle of body grating is bigger, Ke Yikuo
The tunable range of big 2 μm of optical maser wavelength.
In addition, of the invention constitute 2 μm of tunable laser of standing-wave cavity optical parametric oscillator also based on body grating
Various deformation structure, mainly standing wave intracavity reflecting device can there are many distressed structures, as long as the reflection unit is able to cooperate body
Grating adjusts angle, keeps laser in intracavitary oscillation back and forth.And 1 μm of laser of the invention is not limited to Nd:YVO4Swash
Light device, as long as the laser of 1 μm of laser can be generated, nonlinear crystal of the invention is not limited to mix the periodical pole of magnesia
Change lithium columbate crystal, as long as 1 μm of laser can be transformed into the periodic polarized crystal of 2 μm of laser.
Compared with the existing technology, the exportable high light beam quality of 2 μm of tunable laser, relatively high power and narrow line of the invention
2 μm of wide laser, and using standing wave cavity configuration design, cooperation tuning body grating and enter body grating laser between angle with
And the angle between reflection unit, it vibrates laser back and forth in intracavitary holding, the tune of 2 μm of environs wavelength may be implemented
It is humorous.
The invention is not limited to above embodiment, if not departing from the present invention to various changes or deformation of the invention
Spirit and scope, if these changes and deformation belong within the scope of claim and equivalent technologies of the invention, then this hair
It is bright to be also intended to encompass these changes and deformation.
Claims (7)
1. constituting 2 μm of tunable laser of standing-wave cavity optical parametric oscillator based on body grating, it is characterised in that: including 1 μm
Laser and standing-wave cavity optical parametric oscillator；The standing-wave cavity optical parametric oscillator includes the first plane mirror, non-linear crystalline substance
Body, body grating and reflection unit；First plane mirror with high-transmission rate and has high reflection to 2 μm of laser to 1 μm of laser
Rate；The position of 1 μm of laser beam waist is arranged in the nonlinear crystal；2 μm of the body grating fractional transmission and part reflection swash
Light；The laser that 1 μm of laser issues enter after the standing-wave cavity optical parametric oscillator successively first plane mirror,
It is vibrated back and forth between nonlinear crystal, body grating and reflection unit, finally divides two-way to export from the body grating；The body grating
Angle and the angular compliance between the reflection unit, generation wavelength between the laser of the entrance body grating is adjustable
Humorous output laser；The reflection unit is the second plane mirror, and second plane mirror has high reflectance to 2 μm of laser, from
Second plane mirror described in the laser vertical incidence that the body grating diffraction comes out, then be reflected back by second plane mirror along former road
The body grating.
2. 2 μm of tunable laser according to claim 1, it is characterised in that: further include a spectroscope, the spectroscope
Set on standing-wave cavity optical parametric oscillator rear end, to 1 μm of laser with high reflectance and to 2 μm of laser with highly transmissive
Rate.
3. 2 μm of tunable laser according to claim 1, it is characterised in that: it further include a concave mirror, it is described recessed
Face reflecting mirror is set to standing-wave cavity optical parametric oscillator rear end, has high reflectance to 1 μm of laser and 2 μm of laser, from institute
The wherein concave mirror described in laser vertical incidence all the way of body grating output is stated, then by the concave mirror along former road reflection
Return the body grating.
4. 2 μm of tunable laser according to claim 3, it is characterised in that: further include an isolator, the isolator
Between 1 μm of laser and the standing-wave cavity optical parametric oscillator.
5. 2 μm of tunable laser according to claim 4, it is characterised in that: the isolator include the first half-wave plate,
Beam-dividing cube, 45 ° of Faraday rotators and the second half-wave plate, the laser that 1 μm of laser issues pass sequentially through described the
Half of wave plate, beam-dividing cube, 45 ° of Faraday rotators and the second half-wave plate.
6. 2 μm of tunable laser according to claim 4, it is characterised in that: further include a positive lens, the positive lens
Between the isolator and the standing-wave cavity optical parametric oscillator, there is high-transmission rate to 1 μm of laser.
7. 2 μm of tunable laser according to claim 6, it is characterised in that: transmission of the body grating to 2 μm of laser
Rate is 30%, reflectivity 70%.
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2016
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010104489A1 (en) * | 2009-03-10 | 2010-09-16 | Bae Systems Information And Electronic Systems Integration Inc. | Pump recycling scheme for terahertz generation |
| CN105006734A (en) * | 2013-03-29 | 2015-10-28 | 中山大学 | 2-micron laser based on half-intracavity optical parametric oscillator containing volume grating |
Non-Patent Citations (3)
| Title |
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| 2.1 um four-mirror standing-wave optical parametric oscillator with high brightness and efficienc;J Guo et al.;《LASER PHYSICS LETTERS》;20130920;第10卷;第2-3页，图1 * |
| Joint thermal effects of VBG and nonlinear crystal in a singly resonant OPO;Xionghua Zhang et al.;《IEEE PHOTONICS THCHNOLOGY LETTERS》;20160515;第28卷(第10期);第1107-1108页，附图1 * |
| Xionghua Zhang et al..Joint thermal effects of VBG and nonlinear crystal in a singly resonant OPO.《IEEE PHOTONICS THCHNOLOGY LETTERS》.2016,第28卷(第10期),第1107-1108页，附图1. * |
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