CN106340797A - 2[miu] tunable laser for body grating based and structured ring cavity optical parametric oscillator - Google Patents
2[miu] tunable laser for body grating based and structured ring cavity optical parametric oscillator Download PDFInfo
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- CN106340797A CN106340797A CN201610945204.1A CN201610945204A CN106340797A CN 106340797 A CN106340797 A CN 106340797A CN 201610945204 A CN201610945204 A CN 201610945204A CN 106340797 A CN106340797 A CN 106340797A
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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
The invention provides a 2[miu] tunable laser for body grating based and structured ring cavity optical parametric oscillator, comprising a 1 [miu] laser and a ring cavity optical parametric oscillator wherein the ring cavity optical parametric oscillator includes a first plane mirror, a non-linear crystal, a body grating and a reflecting device. The first plane mirror has high transmittance to 1 [miu] laser and high reflectivity to 2 [miu] laser. The non-linear crystal is arranged at the position of the 1 [miu] laser beam waist. The body grating partially transmits and partially reflects the 2 [miu] laser. After the laser emitted from the 1 [miu] laser enters the ring cavity optical parametric oscillator, it undergoes unidirectional ring oscillation sequentially from the first plane mirror, the non-linear crystal, the body grating and the reflecting device before going out from the body grating. The body grating, the angle of the body grating to the incoming laser and the angle of the body grating to the reflecting device cooperate to generate wavelength tunable laser to be outputted afterwards. The 2[miu] tunable laser of the invention can output high quality beams of tunable wavelength 2[miu] with high power and narrow linewidth.
Description
Technical field
The present invention relates to laser technology field, more particularly, to one kind constitute annular chamber optical parametric oscillator based on body grating
2 μm of tunable laser.
Background technology
2 μm of lasing light emitters militarily have important using value, and it be pumping phosphorus germanium zinc optical parametric oscillator (opo,
Optical parametric oscillator) produce mid-infrared laser (3-5 μm of laser) perfect light source.Further, in doctor
The fields such as treatment, remote sensing and material science, 2 μm of lasing light emitters also have huge potentiality.Therefore, 2 μm of lasing light emitters are always domestic and international
The focus of research.
At present, the method producing 2 μm of laser mainly has three kinds: 1) uses 2 μm of the solid state laser generation mixed tm or mix ho
Laser；2) use and mix tm optical fiber laser 2 μm of laser of generation；3) using mixing 1 μm of solid state laser of rubidium, pumping ktpopo or
Ppln opo etc., 1 μm of laser is converted into 2 μm of laser.First two laser instrument is directly produced to the technology not yet ten of 2 μm of laser
It is divided into ripe, its apparatus expensive, relatively costly.And the third utilizes 1 μm of solid state laser pumping opo to produce the structure of 2 μm of laser
Simply, technology maturation, lower cost, and higher power output can be produced, therefore its application is relatively broad.
Optical parametric oscillator (opo) technology is a kind of technology that can produce broadband continuously adjustable laser, its utilization
There are three couple waves in the second order nonlinear effect of nonlinear crystal, the pump light propagated in nonlinear crystal and two parameteric lights
Interact, thus realizing light energy to be converted into two low frequency parameteric lights from high frequency pump light, it is highly suitable for producing red
Outer and in, the laser of far infrared band.Usage cycles polarized crystal meets e → e+e as nonlinear crystal, matching way,
The 2 μm of flashlights producing can obtain extreme efficiency all for pumping phosphorus germanium zinc optical parametric oscillator with ideler frequency light.In order to
Using maximum nonlinear factor, overcome walk-off effect, improve conversion efficiency, obtain high-power output, typically adopt periodicity pole
Change Lithium metaniobate (ppln), periodic polarized phosphoric acid fluorine titanium potassium (ppktp) and periodic polarized lithium tantalate (pplt) as periodically
Polarized crystal.But, 2 of the ordinary optical parametric oscillator output based on ppln, ppktp and pplt quasi-periodic polarized crystal
The all non-constant width of live width of μm laser, generally more than 60nm, beyond the reception line less than 7nm of phosphorus germanium zinc optical parametric oscillator
Wide.Therefore, in order to improve the conversion efficiency of mid-infrared laser, needs carry out live width to 2 μm of lasing light emitters further and narrow.
The structure producing the laser instrument of 2 μm of laser using optical parametric oscillator can adopt external cavity type or intracavity, outward
Cavity structure refers to that optical parametric oscillator is arranged on the outside of 1 μm of laser instrument, and intracavity structure refers to optical parametric oscillator
It is arranged on the inside of 1 μm of laser instrument.In intracavity structure, in order to reduce threshold value, improve the conversion efficiency of pump light, make pumping
Laser comes and goes and passes through nonlinear crystal, and outgoing mirror generally reflects to pumping laser, and light echo is got to can affect pump on pump laser
The service life of Pu laser instrument.
In addition, beam quality factor is assessment and the 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, θ0Far-field divergence angle for basement membrane Gaussian beam.When beam quality is 1, there is best beam quality.At present by
Optical parametric oscillator produces the beam quality of 2 μm of laser and ideal situation also has larger gap, still fails to fully meet at present
The needs of application.
All in all, it is currently based on that the beam quality that optical parametric oscillator technology obtains is not good, output is inadequate
Height, and wavelength tuning range is also smaller.
Content of the invention
It is an object of the invention to overcome shortcoming of the prior art with not enough, provide a kind of high efficiency, high light beam quality,
Line width and 2 μm of laser instrument of tunable wave length.
The present invention is achieved by the following technical solutions: constitutes 2 μ of annular chamber optical parametric oscillator based on body grating
M tunable laser, including 1 μm of laser instrument and annular chamber optical parametric oscillator, described annular chamber optical parametric oscillator bag
Include the first plane mirror, nonlinear crystal, body grating and reflection unit；Described first plane mirror has high-transmission rate to 1 μm of laser
And to 2 μm of laser, there is high reflectance；Described nonlinear crystal is arranged on the position of 1 μm of laser beam waist；Described body grating portion
Transmission and part is divided to reflect 2 μm of laser；After the laser that described 1 μm of laser instrument sends enters described annular chamber optical parametric oscillator
One direction ring oscillation between described first plane mirror, nonlinear crystal, body grating and reflection unit successively, finally from described
Body grating exports；Described body grating and enter described body grating laser between angle and and described reflection unit between
Angular compliance, produces the output laser of tunable wave length.
With respect to prior art, the exportable high light beam quality of 2 μm of tunable laser of the present invention, relatively high power and narrow line
2 μm of wide laser, and using ring cavity structure design, cooperation tuning body grating and enter body grating laser between angle with
And the angle and reflection unit between, make laser keep ring oscillation in intracavity, it is possible to achieve the tune of 2 μm of environs wavelength
Humorous.
Further, described reflection unit is a concave surface hysteroscope, and described concave surface hysteroscope has high reflectance to 2 μm of laser, from
Described body grating diffraction laser out reflexes to described first plane mirror through described concave surface hysteroscope.
Further, from described body grating diffraction, laser out reaches described concave surface hysteroscope through described nonlinear crystal,
Again described first plane mirror is reflexed to by described concave surface hysteroscope.
Further, described reflection unit is an optics microscope group being made up of at least three optical frames.
Further, described optics microscope group includes the second plane mirror, the 3rd plane mirror, intracavity plus lens and fourth plane mirror,
Described second plane mirror, the 3rd plane mirror and fourth plane mirror have high reflectance to 2 μm of laser, and described intracavity plus lens are to 2 μ
M laser has high-transmission rate, reflexes to the described 3rd from described body grating diffraction laser out through described second plane mirror
Plane mirror, more described intracavity plus lens are reflexed to by described 3rd plane mirror, then focus to described through described intracavity plus lens
Fourth plane mirror, more described first plane mirror is reflexed to by described fourth plane mirror.
Further, described 2 μm of tunable laser also include a dichroic mirror, and described dichroic mirror is located at described annular chamber optics
Parametric oscillator rear end, has high reflectance and has high-transmission rate to 2 μm of laser to 1 μm of laser.Described dichroic mirror was used for
Filter remaining 1 μm of laser, export 2 μm of pure laser.
Further, described 2 μm of tunable laser also include an isolator, and described isolator is located at described 1 μm of laser instrument
And described annular chamber optical parametric oscillator between.Described isolator is used for preventing the 1 μm of laser returning to laser instrument and light
The harmful effect that road system produces.
Further, described isolator includes the first half-wave plate, beam-dividing cube, 45 ° of Faraday rotators and the second half-wave
Piece, the laser that described 1 μm of laser instrument sends pass sequentially through described first half-wave plate, beam-dividing cube, 45 ° of Faraday rotators and
Second half-wave plate.
Further, described 2 μm of tunable laser also include plus lens, and described plus lens are located at described isolator and institute
State between annular chamber optical parametric oscillator, to 1 μm of laser, there is high-transmission rate.1 μm of laser warp from the output of described isolator
Cross described plus lens to focus on.
Further, described body grating is 30% to the absorbance of 2 μm of laser, and reflectance is 70%.
In order to more fully understand and implement, describe the present invention below in conjunction with the accompanying drawings in detail.
Brief description
Fig. 1 is the reality of 2 μm of tunable laser constituting annular chamber optical parametric oscillator based on body grating of the present invention
Apply the structural representation of example 1.
Fig. 2 is the beam radius scattergram in annular chamber optical parametric oscillator shown in Fig. 1 400.
Fig. 3 is the laser beam quality measuring figure of 2 μm of tunable laser outputs shown in Fig. 1.
Fig. 4 is the reality of 2 μm of tunable laser constituting annular chamber optical parametric oscillator based on body grating of the present invention
Apply the structural representation of example 2.
Fig. 5 is the beam radius scattergram in annular chamber optical parametric oscillator shown in Fig. 4 400 '.
Specific embodiment
The present invention designs special ring traveling wave cavity structure, is narrowed as live width and wavelength tuning element using body grating, leads to
The optical maser wavelength crossing body grating meets Bragg condition: 2n λ cos θ=λ, and n is refractive index, and λ is the body grating cycle, and λ is diffraction
Optical maser wavelength., to different incident lasers, under different angle of incidence, the laser of only single wavelength can be from body light for body grating
Specific direction diffraction is pressed out in grid.By the angle tuning between body grating and incident laser, realize the ripple to output laser
Long tuning.
Hereinafter, it is described in detail by specific embodiment.
Embodiment 1
Refer to Fig. 1, it is constituting 2 μm of annular chamber optical parametric oscillator based on body grating and tunable swashing of the present invention
The structural representation of the embodiment 1 of light device, including 1 μm of laser instrument 100 being arranged in order along light path direction of advance, isolator 200,
Plus lens 300, annular chamber optical parametric oscillator 400 and dichroic mirror 500.
Specifically, in the present embodiment, described 1 μm of laser instrument 100 is nd:yvo4Laser instrument, 1 μm of arteries and veins of output linear polarization
Impulse light, this nd:yvo4The repetition rate of laser instrument is 20khz, and output mean power is 6.8w.
Described isolator 200 includes the first half-wave plate 210,220,45 ° of Faraday rotators 230 and second of beam-dividing cube
Half-wave plate 240.First half-wave plate 210 unidirectional can only be passed sequentially through by 1 μm of laser that 1 μm of laser instrument 100 exports, beam splitting is stood
220,45 ° of Faraday rotators 230 of cube and the second half-wave plate 240, then export to plus lens 300.Described isolator 200 is used
In the harmful effect preventing the 1 μm of laser returning from laser instrument and light path system are produced.
The focal length of described plus lens 300 is 200mm, has high-transmission rate to 1 μm of laser.From isolator 200 output 1 μm
Laser, after plus lens 300 focusing, enters annular chamber optical parametric oscillator 400.
Described annular chamber optical parametric oscillator 400 includes the first plane mirror 410, nonlinear crystal 420, body grating 430
And reflection unit.In the present embodiment, this reflection unit is concave surface hysteroscope 440.The 1 μm of laser focusing on through plus lens 300 enters
Enter in this annular chamber optical parametric oscillator 400, successively in the first plane mirror 410, nonlinear crystal 420, body grating 430 and recessed
One direction ring oscillation between face hysteroscope 440, and constantly amplify at nonlinear crystal 420, finally defeated from body grating 430
Go out.
Described first plane mirror 410 has high-transmission rate and has high reflectance to 2 μm of laser to 1 μm of laser.Through just
1 μm of laser non-normal incidence first plane mirror 410 that lens 300 focus on.
Described nonlinear crystal 420 is arranged on the position of 1 μm of laser beam waist.In the present embodiment, nonlinear crystal 420
For mixing the periodic polarized lithium columbate crystal of magnesium oxide.The 1 μm of laser transmitting from the first plane mirror 410 enters non-linear crystalline substance
Body 420, when 1 μm of power is sufficiently high, due to nonlinear effect, has portion of energy to be transformed into 2 μm.
Described body grating 430 fractional transmission and part reflect 2 μm of laser.In the present embodiment, body grating 430 swashs to 2 μm
The absorbance of light is 30%, and reflectance is 70%.The 2 μm of laser amplifying through nonlinear crystal 420 enter body grating 430, pass through
Adjust the angle between body grating 430 and the laser entering body grating 430, tuning laser wave out from body grating 430 diffraction
Long.
Described concave surface hysteroscope 440 has high reflectance to 2 μm of laser, and curvature is 125mm.From body grating 430 diffraction out
Laser through nonlinear crystal 420 reach concave surface hysteroscope 440, when body grating 430 and enter body grating 430 laser between
When angle changes, also can change from body grating 430 diffraction laser direction out, cooperation adjusts concave surface hysteroscope 440
And the angle between body grating 430 diffraction laser out, makes laser reflex to the first plane mirror through concave surface hysteroscope 440
410, then nonlinear crystal 420 is reflexed to by the first plane mirror 410, keep ring oscillation.
Described dichroic mirror 500 has high reflectance and has high-transmission rate to 2 μm of laser to 1 μm of laser.From body grating 430
Through dichroic mirror 500, dichroic mirror 500 is used for filtering remaining 1 μm of laser to the laser of output, exports 2 μm of pure laser.
The operation principle of 2 μm of tunable laser of the present invention described further below: when 1 μm of laser instrument 100 is opened, produce
1 μm of raw laser passes sequentially through the first half-wave plate 210 in isolator 200,220,45 ° of Faraday rotators of beam-dividing cube
230 and second half-wave plate 240, it is then passed through plus lens 300 and focuses on entering annular cavity optical parametric oscillator 400, when 1 μm of power
When sufficiently high, due to nonlinear effect, portion of energy is had to be transformed into 2 μm.2 μm of laser is successively in the first plane mirror 410, non-
One direction ring oscillation between linear crystal 420, body grating 430 and concave surface hysteroscope 440, and at nonlinear crystal 420 not
Disconnected amplification, the transmission output from body grating 430 of 2 μm of laser of part.According to Bragg condition 2n λ cos θ=λ, body grating 430 is right
In different incident light waves, only unique wavelength can form the order of diffraction in the reflected light coherent enhancement of different grating planars,
Could from body grating 430 in a specified direction diffraction out, and the light of its commplementary wave length is unsatisfactory for Bragg condition, is merely able to
It is emitted through body grating 430.2 μm of laser when transmiting body grating 430, using the selection to wavelength for the body grating 430, only very
2 μm of laser of narrow linewidth define annular chamber, and then have obtained 2 μm of laser outputs of narrow linewidth.Further, body grating 430 with
The adjustable angle entering between the laser of body grating 430 is humorous, the different incident angle of correspondence, and the wavelength of diffraction also can be different, root
Pass through to adjust the angle between body grating 430 and the laser entering body grating 430 according to this point, cooperation adjusts concave surface hysteroscope 440
And the angle between body grating 430 diffraction laser out is it is ensured that concave surface hysteroscope 440 receives body grating 430 diffraction out
Laser and by this laser-bounce to described first plane mirror 410, then nonlinear crystal 420 is reflexed to by the first plane mirror 410,
Keep ring oscillation, thus realizing the output wavelength tuning to 2 μm of laser.
In the present embodiment, during body grating 430 normal incidence, centre wavelength is 2129.6nm, that is, export 2 μm of laser with correspondence
Adjusting body grating 430 angle change relation is: λout=2129.6×cosθ.In experiment body grating 430 angle tuning scope be 0～
20 °, it is possible to achieve, from the laser tuning of 2000nm to 2270nm wave band, continuing to increase angle of regulation range can be real for 2 μm of laser
Existing larger range of wavelength tuning.
The present embodiment sets a length of 215mm in chamber of annular chamber optical parametric oscillator 400, and body pressed close to by nonlinear crystal 420
Grating 430 is arranged.Refer to Fig. 2, it is the beam radius scattergram in annular chamber optical parametric oscillator shown in Fig. 1 400.?
This ring cavity structure sets down it can be seen that the beam radius at nonlinear crystal 420 are as 195 μm.Refer to Fig. 3, it is Fig. 1 institute
Show the laser beam quality measuring figure of 2 μm of tunable laser outputs.It can be seen that this output laser in the horizontal direction and
The beam quality factor of vertical direction is respectively 1.85 and 2.37, increases compared with the beam quality of prior art.
Embodiment 2
Refer to Fig. 4, it is constituting 2 μm of annular chamber optical parametric oscillator based on body grating and tunable swashing of the present invention
The structural representation of the embodiment 2 of light device.The present embodiment is annular chamber optical parametric oscillator 400 ' with the difference of embodiment 1
Interior reflection unit is an optics microscope group, including the second plane mirror 441, the 3rd plane mirror 442, intracavity plus lens 443 and the 4th
Plane mirror 444.The 1 μm of laser focusing on through plus lens 300 enters in this annular chamber optical parametric oscillator 400 ', successively the
One plane mirror 410, nonlinear crystal 420, body grating 430, the second plane mirror 441, the 3rd plane mirror 442, intracavity plus lens 443
One direction ring oscillation and fourth plane mirror 444 between, and constantly amplify at nonlinear crystal 420, finally from body grating
430 outputs.
Described second plane mirror 441, the 3rd plane mirror 442 and fourth plane mirror 444 have high reflectance to 2 μm of laser,
The focal length of described intracavity plus lens 443 is 75mm, has high-transmission rate to 2 μm of laser.From body grating 430 diffraction laser out
Reflex to the 3rd plane mirror 442 through the second plane mirror 441, then intracavity plus lens 443 are reflexed to by the 3rd plane mirror 442, then
Focus to fourth plane mirror 444 through intracavity plus lens 443, then the first plane mirror 410 is reflexed to by fourth plane mirror 444.When
Angle between body grating 430 and the laser entering body grating 430 is when changing, cooperation adjust the second plane mirror 441 with from
Angle between body grating 430 diffraction laser out, makes laser reflex to the 3rd plane mirror 442 through the second plane mirror 441,
Again intracavity plus lens 443 are reflexed to by the 3rd plane mirror 442, then focus to fourth plane mirror 444 through intracavity plus lens 443,
Again the first plane mirror 410 is reflexed to by fourth plane mirror 444, then nonlinear crystal 420 is reflexed to by the first plane mirror 410, protect
Hold ring oscillation.
The operation principle of 2 μm of tunable laser of the present invention described further below: when 1 μm of laser instrument 100 is opened, produce
1 μm of raw laser passes sequentially through the first half-wave plate 210 in isolator 200,220,45 ° of Faraday rotators of beam-dividing cube
230 and second half-wave plate 240, it is then passed through plus lens 300 and focuses on entering annular cavity optical parametric oscillator 400 ', when 1 μm of work(
When rate is sufficiently high, due to nonlinear effect, portion of energy is had to be transformed into 2 μm.2 μm of laser successively the first plane mirror 410,
Nonlinear crystal 420, body grating 430, the second plane mirror 441, the 3rd plane mirror 442, intracavity plus lens 443 and fourth plane mirror
One direction ring oscillation between 444, and constantly amplify at nonlinear crystal 420,2 μm of laser of part are from body grating 430
Transmission exports.According to Bragg condition 2n λ cos θ=λ, body grating 430 is for different incident light waves, only unique wavelength
The order of diffraction can be formed in the reflected light coherent enhancement of different grating planars, could spread out in a specified direction from body grating 430
Shoot out, and the light of its commplementary wave length is unsatisfactory for Bragg condition, be merely able to transmitted through body grating 430.2 μm of laser are transmiting body
During grating 430, using the selection to wavelength for the body grating 430,2 μm of laser of only very narrow linewidth define annular chamber, enter
And obtained 2 μm of laser outputs of narrow linewidth.Further, the angle between body grating 430 and the laser entering body grating 430 can
Tuning, the different incident angle of correspondence, the wavelength of diffraction also can be different, pass through to adjust the angle of body grating 430 according to this point,
Cooperation adjusts the second plane mirror 441 and the angle between body grating 430 diffraction laser out it is ensured that the second plane mirror 441
Receive body grating 430 diffraction laser out and by this laser-bounce to described 3rd plane mirror 442, keep ring oscillation,
Thus realizing the output wavelength tuning to 2 μm of laser.
In the present embodiment, during body grating 430 normal incidence, centre wavelength is 2129.6nm, that is, export 2 μm of laser with correspondence
Adjusting body grating 430 angle change relation is: λout=2129.6 × cos θ, in experiment body grating 430 angle tuning scope be 0～
30 °, it is possible to achieve, from the laser tuning of 1850nm to 2510nm wave band, continuing to increase angle of regulation range can be real for 2 μm of laser
Existing larger range of wavelength tuning.
The present embodiment sets a length of 260mm in chamber of annular chamber optical parametric oscillator 400, refers to Fig. 5, it is Fig. 4 institute
Show the beam radius scattergram in annular chamber optical parametric oscillator 400 '.It can be seen that non-thread under this ring cavity structure sets
Property crystal 420 at beam radius be 200 μm.
Additionally, the present invention's is also had based on 2 μm of tunable laser that body grating constitutes annular chamber optical parametric oscillator
Various deformation structure, mainly annular intracavity reflecting device can have various deformation structure, as long as this reflection unit energy ligand
Grating adjusts angle, keeps laser in the ring oscillation of intracavity.And, 1 μm of laser instrument of the present invention is not limited to nd:yvo4Swash
Light device, as long as the laser instrument of 1 μm of laser can be produced, the nonlinear crystal of the present invention is not limited to mix the periodicity pole of magnesium oxide
Change lithium columbate crystal, as long as 1 μm of laser can be transformed into the periodic polarized crystal of 2 μm of laser.
With respect to prior art, the exportable high light beam quality of 2 μm of tunable laser of the present invention, relatively high power and narrow line
2 μm of wide laser, and using ring cavity structure design, cooperation tuning body grating and enter body grating laser between angle with
And the angle and reflection unit between, make laser keep ring oscillation in intracavity, it is possible to achieve the tune of 2 μm of environs wavelength
Humorous.
The invention is not limited in above-mentioned embodiment, if the various changes to the present invention or deformation are without departing from the present invention
Spirit and scope, if these are changed and within the scope of deformation belongs to claim and the equivalent technologies of the present invention, then this
Bright it is also intended to comprise these and changes and deform.
Claims (10)
1. based on body grating constitute annular chamber optical parametric oscillator 2 μm of tunable laser it is characterised in that: include 1 μm
Laser instrument and annular chamber optical parametric oscillator, described annular chamber optical parametric oscillator includes the first plane mirror, non-linear crystalline substance
Body, body grating and reflection unit；Described first plane mirror has high-transmission rate and has high reflection to 2 μm of laser to 1 μm of laser
Rate；Described nonlinear crystal is arranged on the position of 1 μm of laser beam waist；Described body grating fractional transmission and 2 μm of part reflection swash
Light；Laser that described 1 μm of laser instrument sends enter after described annular chamber optical parametric oscillator successively described first plane mirror,
One direction ring oscillation between nonlinear crystal, body grating and reflection unit, finally exports from described body grating；Described body grating
And enter the angle between the laser of described body grating and the angular compliance and described reflection unit between, produce Wavelength tunable
Humorous output laser.
2. 2 μm of tunable laser according to claim 1 it is characterised in that: described reflection unit be a concave surface hysteroscope,
Described concave surface hysteroscope has high reflectance to 2 μm of laser, from described body grating diffraction laser out through described concave surface hysteroscope
Reflex to described first plane mirror.
3. 2 μm of tunable laser according to claim 2 it is characterised in that: from described body grating diffraction out swash
Light reaches described concave surface hysteroscope through described nonlinear crystal, then reflexes to described first plane mirror by described concave surface hysteroscope.
4. 2 μm of tunable laser according to claim 1 it is characterised in that: described reflection unit is one by least three
The optics microscope group of individual optical frames composition.
5. 2 μm of tunable laser according to claim 4 it is characterised in that: described optics microscope group includes the second plane
Mirror, the 3rd plane mirror, intracavity plus lens and fourth plane mirror, described second plane mirror, the 3rd plane mirror and fourth plane mirror are to 2
μm laser has high reflectance, described intracavity plus lens have high-transmission rate to 2 μm of laser, from described body grating diffraction out
Laser reflexes to described 3rd plane mirror through described second plane mirror, is more just reflexing to described intracavity by described 3rd plane mirror
Lens, then focus to described fourth plane mirror through described intracavity plus lens, then reflex to described by described fourth plane mirror
One plane mirror.
6. 2 μm of tunable laser according to any claim in claim 1-5 it is characterised in that: also include one
Dichroic mirror, described dichroic mirror, located at described annular chamber optical parametric oscillator rear end, has high reflectance and to 2 μ to 1 μm of laser
M laser has high-transmission rate.
7. 2 μm of tunable laser according to claim 6 it is characterised in that: also include an isolator, described isolator
Located between described 1 μm of laser instrument and described annular chamber optical parametric oscillator.
8. 2 μm of tunable laser according to claim 7 it is characterised in that: described isolator include the first half-wave plate,
Beam-dividing cube, 45 ° of Faraday rotators and the second half-wave plate, the laser that described 1 μm of laser instrument sends passes sequentially through described
Half of wave plate, beam-dividing cube, 45 ° of Faraday rotators and the second half-wave plate.
9. 2 μm of tunable laser according to claim 7 it is characterised in that: also include plus lens, described plus lens
Between described isolator and described annular chamber optical parametric oscillator, to 1 μm of laser, there is high-transmission rate.
10. 2 μm of tunable laser according to claim 9 it is characterised in that: described body grating is saturating to 2 μm of laser
Rate of penetrating is 30%, and reflectance is 70%.
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| CN107565356A (en) * | 2017-10-18 | 2018-01-09 | 哈尔滨工业大学 | A kind of 1.9 microns of Solid State Laser generating means of hectowatt grade |
| CN117293636A (en) * | 2023-11-27 | 2023-12-26 | 长春理工大学 | Double-comb middle infrared oscillator |
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| CN107565356A (en) * | 2017-10-18 | 2018-01-09 | 哈尔滨工业大学 | A kind of 1.9 microns of Solid State Laser generating means of hectowatt grade |
| CN117293636A (en) * | 2023-11-27 | 2023-12-26 | 长春理工大学 | Double-comb middle infrared oscillator |
| CN117293636B (en) * | 2023-11-27 | 2024-02-23 | 长春理工大学 | Double-comb middle infrared oscillator |
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| CN106340797B (en) | 2019-01-18 |
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