CN109742648A - Infrared solid laser based on exocoel optical parametric oscillation and stimulated raman scattering - Google Patents
Infrared solid laser based on exocoel optical parametric oscillation and stimulated raman scattering Download PDFInfo
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- CN109742648A CN109742648A CN201910080027.9A CN201910080027A CN109742648A CN 109742648 A CN109742648 A CN 109742648A CN 201910080027 A CN201910080027 A CN 201910080027A CN 109742648 A CN109742648 A CN 109742648A
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Abstract
The present invention discloses a kind of infrared solid laser based on exocoel optical parametric oscillation and stimulated raman scattering comprising pumping source, half wave plate, coupled lens, laser resonator, OPO crystal and Raman crystal；The laser resonator is the ring-like chamber of four mirrors being made of a pair of of flat mirror and a pair of of concave mirror；Two optical circuit paths between two flat mirrors and two concave mirrors are crossed to form " 8 " font optical path；OPO crystal is in the optical path between two concave mirrors, and Raman crystal is in the optical path between two flat mirrors；The pumping laser of pumping source output successively after half wave plate and coupled lens, is incident to laser resonator from one of concave mirror of laser resonator.Optical Maser System of the present invention is made of exocoel optical parametric oscillator (OPO) and Ramar laser, optical parametric oscillator uses quasi-phase matching, the broad tuning for realizing signal light and ideler frequency light, using signal light as fundamental frequency light, to realize the tunable output of Raman light.The present invention can all solidstate design, simple and compact for structure, good operating stability.
Description
Technical field
The present invention relates to the infrared solid lasers that multi-wavelength exports simultaneously, especially a kind of to be based on exocoel optical parametric oscillation
With the tunable continuous wave infrared solid laser of stimulated raman scattering.
Background technique
Tunable continuous wave multi-wavelength infrared laser is in fields such as spectrum analysis, atmospheric monitoring, remote sensing and photoelectronic warfares
There is important application prospect.Solid state laser based on optical parametric oscillation and crystal stimulated raman scattering has following spy
Point: (1) utilizing intracavitary fundamental frequency light high power density, reduces crystal stimulated Raman scattering threshold value；(2) letter of intracavitary resonance
Number light has narrow line width, the Raman gain coefficienct of Raman crystal can be improved, to improve Raman light conversion efficiency；(3) whole
A laser can accomplish compact and miniaturization；(4) can be achieved the near-infrared first Stokes light of continuous broad tuning, signal light and in
Infrared ideler frequency light multi-wavelength exports simultaneously.
Currently, realizing that the main path of tunable infrared laser device has: (1) semiconductor laser can be generated directly red
Wave section laser, and it is able to achieve laser output under room temperature；(2) it is realized by the way of adjusting Raman crystal temperature
The wavelength tuning of Stokes light；(3) infrared band laser is obtained using optical parametric oscillator.But method (1) technology also not ten
Be divided into it is ripe, still in developing stage；Method (2) is difficult to realize wider wavelength tune by way of Raman crystal thermal tuning
It is humorous；And method (2) and method (3) all can not achieve tunable wave length near-infrared and middle infrared band multi-wavelength simultaneously it is defeated
Out.
Summary of the invention
The object of the present invention is to provide a kind of tunable company based on exocoel optical parametric oscillation and stimulated raman scattering
Continuous wave infrared solid laser realizes that the wide of near infrared band first Stokes light, signal light and middle infrared band ideler frequency light is adjusted
Humorous multi-wavelength output.
The technical scheme adopted by the invention is as follows: a kind of infrared solid laser, comprising: pumping source, half wave plate, coupling
Close lens, laser resonator, OPO crystal and Raman crystal；
The laser resonator is the ring-like chamber of four mirrors being made of a pair of of flat mirror and a pair of of concave mirror；A pair of of flat mirror inclined direction phase
Identical to, tilt angle, the concave surface of a pair of of concave mirror is opposite, radius of curvature is identical；Wherein a flat mirror can go out reflection shielding film
Laser beam reflexes to opposite flat mirror, and the laser beam that opposite flat mirror reflects can be reflexed to another concave mirror, and two by another flat mirror
Two optical circuit paths between flat mirror and two concave mirrors intersect；
OPO crystal is in the optical path between two concave mirrors, and Raman crystal is in the optical path between two flat mirrors；
The pumping laser of pumping source output is successively after half wave plate and coupled lens, from one of them of laser resonator
Concave mirror is incident to laser resonator.
The present invention by by signal light singly resonant optical parametric oscillator (Optical parametric oscillator,
OPO it) is organically combined with Ramar laser, that is, utilizes quasi-phase matching, parameteric light wavelength tuning is realized, with intracavitary humorous
The parameteric light of vibration, to realize the advantages of making new Optical Maser System have both OPO and Ramar laser, is realized as fundamental frequency light
The broad tuning multi-wavelength of near infrared band first Stokes light, signal light and middle infrared band ideler frequency light exports.
Preferably, the pumping source is 1 mu m waveband linearly polarized laser device.1.06 μm of continuous wave Yb optical-fiber lasers can be used
Device.
Preferably, in laser resonator, two flat mirrors plate 1400-1800nm wave band high-reflecting film respectively；It is defeated as pump light
The concave mirror for entering mirror plates that 1 mu m waveband is high thoroughly, 1400-1800nm high-reflecting film, the concave mirror plating 3000-4000nm high as outgoing mirror is saturating,
1400-1800nm fractional transmission film.To realize that OPO signal light list resonates, and using the signal light of intracavitary resonance as fundamental frequency light
And realize Raman light output.
Preferably, OPO crystal is selected using magnesia multicycle polarized lithium columbate crystal MgO:PPLN, Raman crystal is mixed
Tungstate crystal or vanadate crystal.
Preferably, it is coated with corresponding 1064nm, 1400-1800nm and 3000- respectively in two light pass surfaces of OPO crystal
The anti-reflection film of tri- band of light of 4000nm, can be improved the transmitance of each band of light.
Preferably, the polarization cycle range of OPO crystal is 28.5-31.5 μm, has 7 periods, and period distances are 0.5 μ
m。
Preferably, the broadband anti-reflection film of 1400-4000nm is coated in the Raman crystal direction both ends of the surface of two flat mirrors respectively, it can
Improve the transmitance of corresponding band of light.
In the present invention, OPO and Ramar laser share same resonant cavity (the ring-like chamber of four mirrors), when the pumping light power of input
Reach OPO threshold value, and meet phase-matching condition, generates parameteric light (signal light and ideler frequency light)；The signal light of intracavitary oscillation is made
After reaching Raman threshold for fundamental frequency light, due to the stimulated raman scattering of Raman crystal, to obtain first Stokes light.This
Invention can make the polarization cycle that pumping laser is different by crystal by translation MgO:PPLN crystal, in combination with to MgO:
The thermal tuning of PPLN crystal, it is final realize near infrared signal light, Raman light and in infrared ideler frequency light continuous broad tuning it is more
Wavelength output.
Further, the invention also includes temperature controlling stove, OPO crystal is located in temperature controlling stove, and the temperature control range of temperature controlling stove is 20-
200℃；
Raman crystal carries out temperature control by TEC temperature controller, and temperature control range is 10-30 DEG C.It is a kind of realization to crystal temperature effect
Furthermore other existing thermal tuning modes except temperature controlling stove can also be used in the mode being tuned.It is contemplated that crystal thermal lens
Effect selectes cavity mirror parameter (radius of curvature of such as hysteroscope, chamber are long), to meet the stability condition of resonant cavity.Pass through adjusting
The hyperfine tuned of Raman light output wavelength then can be achieved in Raman crystal temperature.
Compared with prior art, the present invention has the following advantages that and improves:
(1) optical parametric oscillator and Ramar laser are organically combined, using parameteric light as fundamental frequency light, realizes single order
Stokes light output；And optical parametric oscillator and Ramar laser share same resonant cavity, simple and compact for structure, and work is steady
It is qualitative good；
(2) optical parametric oscillator for using quasi-phase matching, that is, utilize period polarized nonlinear crystal, realizes parameteric light
Continuous broad tuning, to realize the continuous broad tuning of first Stokes light；
(3) by the design of the resonant cavity of system, (chamber length, the radius of curvature of hysteroscope, hysteroscope are in the reflectivity of different-waveband or saturating
Cross rate) and periodical poled crystal period tuning and thermal tuning, realize near-infrared 1400-1550nm band signal light,
1600-1800 wave band first Stokes light and the output of the continuous tuning multi-wavelength of 3000-4000nm wave band ideler frequency light.
Detailed description of the invention
Fig. 1 show the theory structure schematic diagram of the tunable continuous wave infrared solid laser of the present invention.
Specific embodiment
It is further described below in conjunction with the drawings and specific embodiments.
Refering to what is shown in Fig. 1, the present invention is based on the tunable continuous waves of exocoel optical parametric oscillation and stimulated raman scattering
Infrared solid laser, comprising: pumping source, half wave plate, coupled lens, laser resonator, OPO crystal and Raman are brilliant
Body；
The laser resonator is the ring-like chamber of four mirrors being made of a pair of of flat mirror and a pair of of concave mirror；A pair of of flat mirror inclined direction phase
Identical to, tilt angle, the concave surface of a pair of of concave mirror is opposite, radius of curvature is identical；Wherein a flat mirror can go out reflection shielding film
Laser beam reflexes to opposite flat mirror, and the laser beam that opposite flat mirror reflects can be reflexed to another concave mirror, and two by another flat mirror
Two optical circuit paths between flat mirror and two concave mirrors intersect and form " 8 " font optical path；
OPO crystal is in the optical path between two concave mirrors, and Raman crystal is in the optical path between two flat mirrors；
The pumping laser of pumping source output is successively after half wave plate and coupled lens, from one of them of laser resonator
Concave mirror is incident to laser resonator.
The present invention is in use, the polarization side of pump light can be adjusted by adjusting the optical axis direction of half wave plate
To, the size for the pump spot being incident in crystal is controlled according to the coupled lens of pump light source parameter selection suitable parameters,
Specifically refer to the prior art.
Embodiment
The present embodiment Optical Maser System is made of exocoel optical parametric oscillator (OPO) and Ramar laser, optical parametric oscillation
Device uses quasi-phase matching, the broad tuning of signal light and ideler frequency light is realized, using signal light as fundamental frequency light, to realize drawing
The tunable output of graceful light.The system using Yb optical fiber laser be used as pumping source, MgO:PPLN be OPO crystal, tungstates or
Vanadate crystal is Raman crystal, and OPO and Ramar laser share same resonant cavity.Pass through the tuning of crystal period and temperature tune
It is humorous, obtain continuous wave near-infrared first Stokes light, signal light and in the output of infrared three wavelength of ideler frequency light broad tuning.The present invention can
All solidstate design, simple and compact for structure, good operating stability.
With reference to Fig. 1, the present embodiment Optical Maser System by pumping source 1, half wave plate 2, lens 3, hysteroscope (concave mirror) 4,
OPO crystal 5, hysteroscope (concave mirror) 6, hysteroscope (flat mirror) 7, Raman crystal 8 and hysteroscope (flat mirror) 9 form.Hysteroscope 4, hysteroscope 6, chamber
Mirror 7 and hysteroscope 9 constitute the ring-like cavity configuration of four mirrors.OPO crystal 5 be placed on hysteroscope (concave mirror) 4 and hysteroscope (concave mirror) afterwards 6 it
Between, Raman crystal 8 is placed between hysteroscope (flat mirror) 7 and hysteroscope (flat mirror) 9.
The present embodiment is using 1.06 μm of linear polarization Yb optical fiber lasers as pumping source.Half wave plate is for adjusting pumping
The polarization direction of light, to preferably utilize the maximum nonlinear factor of OPO crystal.Hysteroscope 4 and the curvature having the same of hysteroscope 6
Radius, hysteroscope 4 is high to 1064nm, 3000-4000nm wave band thoroughly, high to 1400-1800nm wave band anti-, hysteroscope 6 to 1064nm,
3000-4000nm wave band is high thoroughly, transmits to 1400-1800nm band part.Hysteroscope 7 and hysteroscope 9 are flat mirror, to 1400-
1800nm wave band is high anti-.Two light pass surfaces of MgO:PPLN crystal are coated with 1064nm, 1400-1800nm and 3000-4000nm tri-
The anti-reflection film of a wave band, the polarization cycle range of crystal are 28.5-31.5 μm, totally 7 periods, and period distances are 0.5 μm, MgO:
PPLN crystal is placed in temperature controlling stove, 20-200 DEG C of the temperature control range of temperature controlling stove, the reflecting mirror placed below to 1400-1800nm,
3000-4000nm high is anti-, and Raman crystal is tungstate crystal or vanadate crystal, and the both ends of the surface of crystal are coated with 1400-4000nm
Broadband anti-reflection film, and using TEC temperature control system control crystal temperature effect, 10-30 DEG C of temperature control range.Consider crystal thermal lensing effect
It selectes cavity mirror parameter (radius of curvature of such as hysteroscope, chamber are long), meets the stability condition of resonant cavity.By changing MgO:
The light passing period of PPLN and crystal temperature effect realize the continuously adjustable output of first Stokes light, signal light and ideler frequency light, and can
The hyperfine tuned of Raman light output wavelength is realized by adjusting Raman crystal temperature.The system can get continuous wave near-infrared
1600-1800nm first Stokes light, 1400-1550nm signal light and in infrared three wave of 3000-4000nm ideler frequency light it is tunable
It exports simultaneously.
The working principle of the invention is: pumping source be 1.06 μm of continuous wave Yb optical fiber lasers, the coupled lens of pump light,
Then it is incident in OPO crystal 5 by hysteroscope 4.OPO crystal is located between two concave mirrors, Raman crystal be located at two flat mirrors it
Between.OPO and Ramar laser share same resonant cavity (the ring-like chamber of four mirrors).OPO crystal is polarized using the magnesia multicycle is mixed
Lithium columbate crystal (MgO:PPLN), Raman crystal select tungstate crystal or vanadate crystal.When the pumping light power of input reaches
To OPO threshold value, and meet phase-matching condition, generates parameteric light (signal light and ideler frequency light)；The signal light conduct of intracavitary oscillation
After fundamental frequency light reaches Raman threshold, due to the stimulated raman scattering of Raman crystal, to obtain first Stokes light.This is
System can make the polarization cycle that 1064nm pumping laser is different by crystal by translation MgO:PPLN crystal, in combination with
The thermal tuning of MgO:PPLN crystal, it is final realize near infrared signal light, Raman light and in the continuous of infrared ideler frequency light wide adjust
Humorous multi-wavelength output.
The present invention by by signal light singly resonant optical parametric oscillator (Optical parametric oscillator,
OPO it) is organically combined with Ramar laser, that is, utilizes quasi-phase matching, parameteric light wavelength tuning is realized, with intracavitary humorous
The parameteric light of vibration, to realize the advantages of making new Optical Maser System have both OPO and Ramar laser, is realized as fundamental frequency light
The broad tuning multi-wavelength of near infrared band first Stokes light, signal light and middle infrared band ideler frequency light exports.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of infrared solid laser, characterized in that include: pumping source, half wave plate, coupled lens, laser resonance
Chamber, OPO crystal and Raman crystal；
The laser resonator is the ring-like chamber of four mirrors being made of a pair of of flat mirror and a pair of of concave mirror；A pair of of flat mirror inclined direction phase
Identical to, tilt angle, the concave surface of a pair of of concave mirror is opposite, radius of curvature is identical；Wherein a flat mirror can go out reflection shielding film
Laser beam reflexes to opposite flat mirror, and the laser beam that opposite flat mirror reflects can be reflexed to another concave mirror, and two by another flat mirror
Two optical circuit paths between flat mirror and two concave mirrors intersect；
OPO crystal is in the optical path between two concave mirrors, and Raman crystal is in the optical path between two flat mirrors；
The pumping laser of pumping source output is successively after half wave plate and coupled lens, from one of them of laser resonator
Concave mirror is incident to laser resonator.
2. infrared solid laser according to claim 1, characterized in that the pumping source swashs for 1 mu m waveband linear polarization
Light device.
3. infrared solid laser according to claim 1, characterized in that in laser resonator, two flat mirrors are plated respectively
1400-1800nm wave band high-reflecting film；Concave mirror as pump light input mirror plates high saturating, the 1400-1800nm high-reflecting film of 1 mu m waveband,
Concave mirror plating 3000-4000nm high as outgoing mirror is saturating, 1400-1800nm fractional transmission film.
4. infrared solid laser according to claim 1, characterized in that OPO crystal, which uses, mixes magnesia multicycle pole
The lithium columbate crystal MgO:PPLN of change, Raman crystal select tungstate crystal or vanadate crystal.
5. infrared solid laser according to claim 1, characterized in that plated respectively in two light pass surfaces of OPO crystal
There is the anti-reflection film of corresponding tri- band of light of 1064nm, 1400-1800nm and 3000-4000nm.
6. infrared solid laser according to claim 1, characterized in that the polarization cycle range of OPO crystal is 28.5-
31.5 μm, there are 7 periods, period distances are 0.5 μm.
7. wave infrared solid laser according to claim 1, characterized in that both ends of the surface of the Raman crystal towards two flat mirrors
The upper broadband anti-reflection film for being coated with 1400-4000nm respectively.
8. tunable continuous wave infrared solid laser according to claim 1, characterized in that further include temperature controlling stove, OPO
Crystal is located in temperature controlling stove, and the temperature control range of temperature controlling stove is 20-200 DEG C；
Raman crystal carries out temperature control by TEC temperature controller, and temperature control range is 10-30 DEG C.
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Cited By (4)
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| CN110148882A (en) * | 2019-06-17 | 2019-08-20 | 温州大学 | One kind being based on PPLN optical parametric oscillation signal optical sccond-harmonic generation tuning source |
| CN113314940A (en) * | 2021-05-27 | 2021-08-27 | 长春理工大学 | Multi-wavelength mid-infrared laser pulse train cavity emptying laser based on Nd, MgO and APLN crystals |
| CN113314939A (en) * | 2021-05-27 | 2021-08-27 | 长春理工大学 | Multi-wavelength mid-infrared laser energy ratio regulation and control amplifier based on Nd-MgO-APLN crystal |
| CN113725703A (en) * | 2021-09-02 | 2021-11-30 | 河北工业大学 | Raman laser oscillator with continuously tunable wavelength |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148882A (en) * | 2019-06-17 | 2019-08-20 | 温州大学 | One kind being based on PPLN optical parametric oscillation signal optical sccond-harmonic generation tuning source |
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| CN113314940A (en) * | 2021-05-27 | 2021-08-27 | 长春理工大学 | Multi-wavelength mid-infrared laser pulse train cavity emptying laser based on Nd, MgO and APLN crystals |
| CN113314939A (en) * | 2021-05-27 | 2021-08-27 | 长春理工大学 | Multi-wavelength mid-infrared laser energy ratio regulation and control amplifier based on Nd-MgO-APLN crystal |
| CN113314939B (en) * | 2021-05-27 | 2022-06-03 | 长春理工大学 | Multi-wavelength mid-infrared laser energy ratio regulation and control amplifier based on Nd-MgO-APLN crystal |
| CN113314940B (en) * | 2021-05-27 | 2022-06-03 | 长春理工大学 | Multi-wavelength mid-infrared laser pulse train cavity emptying laser based on Nd, MgO and APLN crystals |
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| CN113725703A (en) * | 2021-09-02 | 2021-11-30 | 河北工业大学 | Raman laser oscillator with continuously tunable wavelength |
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