CN109888607A - A kind of fast tunable intermediate infrared radiation source device and implementation method based on exocoel difference frequency - Google Patents
A kind of fast tunable intermediate infrared radiation source device and implementation method based on exocoel difference frequency Download PDFInfo
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- CN109888607A CN109888607A CN201910351725.8A CN201910351725A CN109888607A CN 109888607 A CN109888607 A CN 109888607A CN 201910351725 A CN201910351725 A CN 201910351725A CN 109888607 A CN109888607 A CN 109888607A
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Abstract
The present invention provides a kind of fast tunable intermediate infrared radiation source device and implementation method based on exocoel difference frequency, pumping source uses Nd:YAG Q-switched laser；Pump light frequency-doubling crystal uses ktp crystal, and frequency-doubling crystal corner cut meets II type-Ⅱphase matching condition, and exocoel difference frequency crystal is BaGa4Se7Crystal carries out optical polish to side, and crystal is placed on rotatable galvanometer platform, is connected with computer, adopts to computerized control and changes BaGa4Se7The applied voltage of ktp crystal in crystal and KTP-OPO, to realize that KTP-OPO wavelength and the wavelength of difference frequency output intermediate infrared radiation quickly tune.The present invention realize have high conversion efficiency, room temperature operating, tuned speed it is fast, it is compact-sized cut the high-performance intermediate infrared radiation source being easily achieved, while KTP-OPO output wavelength and BaGa are controlled by computer simultaneously4Se7The phase-matching condition of crystal realizes that middle infrared wavelength quickly tunes.
Description
Technical field
The invention belongs to non-linear optical field, more particularly, in a kind of fast tunable based on exocoel difference frequency
Infra-red radiation source device and implementation method.
Background technique
In it is infrared refer to wavelength be in 2-20 μm between electromagnetic wave.The frequency range covers 3-5 μm and 8-12 μm two
Important atmospheric window, and middle infrared band contains the eigen vibration transition spectrum and black body radiation light of many important molecules
Spectrum.Mid-infrared light relies on the above characteristic, in remote sensing, medical treatment, material processing, chemical substance detection, environmental monitoring, military accurate system
It leads and the blue lights such as photoelectronic warfare relies on many practical fields such as its specific physical properties to have huge application background.Compared to
Visible light wave range and near infrared band, middle infrared band since its photon energy is lower, using laser means generate in it is infrared
Light wave proposes high requirement for the band gap of laser gain medium.It is straight as laser gain medium using doped crystal or optical fiber
Raw mid-infrared laser of practicing midwifery generally cannot achieve wavelength tuning, and cannot achieve infrared output in more long wavelength.Therefore, at present
Nonlinear frequency transformation is still to generate the best approach of intermediate infrared radiation.
The nonlinear frequency transformation method for generating intermediate infrared radiation specifically includes that (1) is based on CO2The 10.6 of laser generation
μm frequency multiplication (SHG) method realize in infrared output, this method since 10.6 μm of laser energies of leading portion are larger, output energy compared with
Height, but it is constrained to the tuning characteristic of fundamental frequency, tuning range is relatively narrow；(2) optical parametric oscillator pumped based on 1 μm or 2 μm
(OPO) technology, this method design different pumping wavelength and cavity structure according to different nonlinear crystals, height may be implemented
The intermediate infrared radiation source of energy, broad tuning, but its system is complex and proposes high requirement to hysteroscope plated film；(3) it is based on ps
The optical parameter of pulse pump amplifies (OPA) technology, and this method is using ps laser high-peak power characteristic to improve nonlinear optical
Learn transfer efficiency；(4) exocoel and inner cavity difference frequency (DFG) technology, this method is compact-sized to be easily achieved and tuning range is wide, but
It is based on currently used nonlinear crystal, difference frequency means are limited to crystal nonlinear factor, and transfer efficiency is lower.
Nonlinear optical crystal performance has been largely fixed based on infrared in nonlinear optical frequency conversion technology
The performances such as energy, transfer efficiency and tuning range are exported in radiation source.Oxide and non-oxidized substance two are mainly applied at present
The nonlinear crystal of seed type is as infrared output in nonlinear frequency transformation media implementation, but oxide type crystal, example
Such as ktp crystal, KTA crystal, LiNbO3Crystal etc., it is greatly inhaled in 4 μm of above band as caused by own optical mode
It receives coefficient and limits the intermediate infrared radiation source output wavelength range based on this type nonlinear crystal.Non-oxidized substance type crystals
With broader transmission region, it is adjustable to be suitable as high performance wideband for biggish nonlinear factor and higher damage threshold
The nonlinear frequency transformation medium of humorous intermediate infrared radiation source.Currently, AgGaS2 (S-Ga-Ag) crystal is had been achieved with by OPO method
Infrared output in the most wide ultra-wide tuning range to 11.3 μm, but its damage threshold is lower, limit its export energy and
Transfer efficiency；HgGa2S4(sulphur gallium mercury) infrared output in high-energy may be implemented in crystal, but its growth conditions is extremely harsh；
ZnGeP2(phosphorus germanium zinc) crystal is presently the most mature middle infrared crystal, can be achieved by means such as OPO and DFG in it is red
Outer output, but two-photon absorption effect caused by its crystal bandgap structure makes it unsuitable for using 1 μm of laser pump (ing), it is necessary to it adopts
It is pumped with long wave, this also results in the complexity of its front end pumping system.In addition, the artificial lens such as including periodical poled crystal
It can be used for generating intermediate infrared radiation, but its higher cost.
Chalcogenide, BaGa4Se7(selenium gallium barium) crystal belongs to monoclinic system, space group Pc, point group m, transmission region
Reach 1-18 μm, it is minimum in the absorption coefficient of near-infrared and middle infrared band, close to 0.1cm-1.Furthermore its broader band gap
(~2.64eV) making it in 1 mu m waveband, there is no the damage threshold of two-Photon Absorption Properties and crystal is high.BaGa4Se7Crystal tool
There are good physics, chemistry and mechanical performance, crystal can be cut to meet angle with the birefringent characteristic of binding crystal
Spend phase-matching condition.In addition, allowing to avoid DFG process in conjunction with coupledwave equation and its biggish nonlinear factor
Low transfer efficiency defect, while requirement of the OPO in the process for hysteroscope plated film is avoided using exocoel single pumping difference frequency method.
Summary of the invention
In view of this, the invention is directed to a kind of fast tunable intermediate infrared radiation source dress based on exocoel difference frequency
It sets, pumps BaGa jointly using 1 μm of high-energy and the tunable near-infrared ideler frequency light of the high-energy through generating in KTP-OPO4Se7
Crystal passes through the output wavelength and BaGa of control KTP-OPO to realize infrared output in efficiently4Se7The angle of crystal with
Realize the wavelength tuning for the intermediate infrared radiation that difference frequency generates.
In order to achieve the above objectives, the technical solution of the invention is achieved in that
A kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency, pumping source use Nd:YAG Q-switch laser
Device；Pump light frequency-doubling crystal uses ktp crystal, and frequency-doubling crystal corner cut meets II type-Ⅱphase matching condition, and exocoel difference frequency crystal is
BaGa4Se7Crystal, crystal corner cut are θ=55.8 °,8 × 8 × 6mm of crystalline size3, optical polish is carried out to side,
Crystal is placed on rotatable galvanometer platform, is connected with computer, is adopted to computerized control and is changed BaGa4Se7Crystal and KTP-
The applied voltage of ktp crystal in OPO, to realize the fast velocity modulation of wavelength of KTP-OPO wavelength and difference frequency output intermediate infrared radiation
It is humorous.
Further, the laser is neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched laser, and output wavelength is
1064nm, pulsewidth are ns magnitude, and polarization state is the linearly polarized light polarized along the vertical direction.
It further, further include the focus lens group for receiving the laser emitting light, the first 1064nm half-wave plate, setting
After focus lens group, for adjusting the polarization state of 1064nm laser to meet II type-Ⅱphase matching in frequency multiplication ktp crystal
Condition.
Further, the frequency multiplication ktp crystal, corner cut are θ=90 °,15 × 15 × 10mm of size3
For generating high-energy 532nm laser to 1064nm laser freuqency doubling, the 532nm laser of generation is that the line that polarizes along the vertical direction is inclined
Shake light, and the green light of generation is reflected into KTP-OPO system by the one 45 ° of high reflective mirror, pumps OPO system.
Further, the special plated film of the one 45 ° of high reflective mirror progress meets 532nm and 1300~1500nm high instead, and 400
Remaining 1064nm fundamental frequency light reflects~500nm and 1064nm high through the 2nd 45 ° of high reflective mirror thoroughly, and through the 2nd 1064nm half-wave plate
Polarization state is adjusted to reflect to horizontal polarization, then through the 3rd 45 ° of high reflective mirror.
Further, the KTP-OPO uses single-pass structure, including the first hysteroscope, ktp crystal and the second hysteroscope, can
The tunable ideler frequency light of polarization and vertical polarization is generated, 800-900nm high is anti-thoroughly wherein the first hysteroscope plated film meets 532nm high, the second chamber
Mirror plated film meets the anti-1300-1550nm high of 532nm&800-900nm high thoroughly, ktp crystal, and crystal corner cut is θ=62 °,10 × 10 × 15mm of size3, side is carried out optical polish and carries out special plated film to meet 532nm, 700~900nm
And 1300~1550nm wave band is high thoroughly.
Further, it is reflected by the tunable ideler frequency light of polarization vertically that KTP-OPO system generates with through the 3rd 45 ° of high reflective mirror
The coupled mirror of 1064nm laser and beam of horizontal polarization afterwards collinearly enter BaGa4Se7Infrared spoke in difference frequency generation is carried out in crystal
It penetrates, the intermediate infrared radiation that difference frequency generates meets the saturating harmonic wave mirror of the anti-3-5 μm of height of 1064nm&1300-1550nm high through special plated film
Filtering is to exclude remaining pumping interference.
Further, the computer connects the ktp crystal and BaGa in KTP-OPO by data collecting card4Se7It is brilliant
The galvanometer rotating platform of body, while controlling galvanometer rotating platform two crystal angles of rotation and can change the output wave of KTP-OPO
Long and BaGa4Se7The beat frequency phase matching condition of crystal, and then realize the intermediate infrared radiation wavelength tune that difference frequency generates.
Another object of the present invention is to provide a kind of realities of the fast tunable intermediate infrared radiation source device of exocoel difference frequency
Existing method, what concrete scheme was realized in
A kind of implementation method of the fast tunable intermediate infrared radiation source device based on exocoel difference frequency, including following procedure:
The 1064nm linearly polarized light of polarization direction along the vertical direction is generated using Nd:YAG Q-switched laser, through the first 1064nm half-wave plate
Item adjustment laser polarization state is simultaneously incident in the frequency multiplication ktp crystal for the II type-Ⅱphase matching condition that meets, and generates polarization through frequency multiplication
The 532nm laser of state along the vertical direction, 532nm laser are reflected into OPO system through the one 45 ° of high reflective mirror, place in pump cavity
On the ktp crystal above electronic galvanometer rotating platform, it is vertical that crystal generates the polarization state edge that a branch of wavelength is 1.3-15.55 μm
The tunable ideler frequency light in direction, crystal control it by galvanometer and rotate angle to realize wavelength quickly tunes, after frequency multiplication residue
1064nm pump light is incident to after half-wave plate adjustment polarization with the tunable ideler frequency light and beam of the KTP-OPO cross-polarization generated
Novel middle infrared crystal BaGa4Se7Difference frequency is carried out in crystal, crystal controls rotation angle by galvanometer to meet beat frequency phase matching
Condition controls the voltage on galvanometer rotary system by computer, to realize the quick tuning of intermediate infrared radiation wavelength simultaneously.
Compared with the existing technology, a kind of fast tunable intermediate infrared radiation based on exocoel difference frequency described in the invention
Source device and implementation method have the advantage that
The superior novel middle infrared crystal BaGa of utility of the present invention4Se7The near-infrared of crystal and middle infrared band light
Characteristic, KTP-OPO output characteristics and nonlinear optics exocoel difference frequency method are learned in the wide interior acquisition wave of certain wavelength tuning range
Long arbitrary intermediate infrared radiation is realized with high conversion efficiency, room temperature operate, tuned speed is fast, compact-sized cut is easily achieved
High-performance intermediate infrared radiation source.KTP-OPO output wavelength and BaGa are controlled by computer simultaneously simultaneously4Se7The phase of crystal
Matching condition realizes that middle infrared wavelength quickly tunes.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide to further understand the invention, present invention wound
The illustrative embodiments and their description made are used to explain the present invention creation, do not constitute the improper restriction to the invention.?
In attached drawing:
Fig. 1 is that the present invention is based on the fast tunable intermediate infrared radiation source devices of exocoel difference frequency.
Fig. 2 is the bright middle exocoel difference frequency BaGa of the present invention4Se7The Parameter Map of crystal.
Description of symbols:
1- laser；The first 1064nm half-wave plate of 2-；3- frequency multiplication ktp crystal；The one 45 ° of high reflective mirror of 4-；The first hysteroscope of 5-；
6-KTP crystal；The second hysteroscope of 7-；8- coupling mirror；The 2nd 45 ° of high reflective mirror of 9-；The 2nd 1064nm half-wave plate of 10-；The 3rd 45 ° of 11-
High reflective mirror；12-BaGa4Se7Crystal；13- harmonic wave mirror；14- computer.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the invention can
To be combined with each other.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments creates.
Fast tunable intermediate infrared radiation source device based on exocoel difference frequency of the invention, can be with effective acquisition Wavelength tunable
Humorous linear polarization mid-infrared laser, compact-sized and plated film no requirement (NR) is easily achieved, the advantage with room temperature condition operating.This
The fast tunable intermediate infrared radiation source device based on exocoel difference frequency of invention, pumping source use Nd:YAG Q-switched laser；Pumping
Optical sccond-harmonic generation crystal uses ktp crystal, and frequency-doubling crystal corner cut meets II type-Ⅱphase matching condition.Exocoel difference frequency crystal is BaGa4Se7
Crystal, crystal corner cut are θ=55.8 °,8 × 8 × 6mm of crystalline size3, optical polish is carried out to side, crystal is placed in
On rotatable galvanometer platform, it is connected with computer, adopts to computerized control and change BaGa4Se7KTP in crystal and KTP-OPO
The applied voltage of crystal, to realize that KTP-OPO wavelength and the wavelength of difference frequency output intermediate infrared radiation quickly tune.
As shown in Figure 1, the fast tunable intermediate infrared radiation source device of the invention based on exocoel difference frequency, has specifically included
Laser 1 described in laser 1 is neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched laser, output wavelength 1064nm, pulsewidth ns
Magnitude, polarization state are the linearly polarized light polarized along the vertical direction.It is additionally provided with:
First 1064nm half-wave plate 2 is arranged after focus lens group, for adjusting the polarization state of 1064nm laser with full
II type-Ⅱphase matching condition in sufficient frequency multiplication ktp crystal 3.
Frequency multiplication ktp crystal 3, corner cut are θ=90 °,15 × 15 × 10mm of size3For swashing to 1064nm
Optical sccond-harmonic generation generates high-energy 532nm laser, and the 532nm laser of generation is the linearly polarized light polarized along the vertical direction, generation it is green
Light is reflected into KTP-OPO system by the one 45 ° of high reflective mirror 4, pumps OPO system.
One 45 ° of high reflective mirror 4 carries out special plated film, and to meet 532nm and 1300~1500nm high anti-, 400~500nm with
Remaining 1064nm fundamental frequency light reflects 1064nm high through the 2nd 45 ° of high reflective mirror 9 thoroughly, and adjusts partially through the 2nd 1064nm half-wave plate 10
Polarization state is reflected to horizontal polarization, then through the 3rd 45 ° of high reflective mirror 11.
KTP-OPO uses single-pass structure, is made of the first hysteroscope 5, the second hysteroscope 7 and ktp crystal 6, and it is vertical to can produce
Ideler frequency light that polarization state is tunable, wherein 5 plated film of the first hysteroscope meets 532nm high, 800-900nm high is anti-thoroughly, 7 plated film of the second hysteroscope
Meeting the anti-1300-1550nm high of 532nm&800-900nm high thoroughly, ktp crystal 6, crystal corner cut is θ=62 °,Size
10×10×15mm3, optical polish is carried out to side and carry out special plated film meet 532nm, 700~900nm and 1300~
1550nm wave band is high thoroughly.
Tunable ideler frequency light and the water after the 3rd 45 ° of high reflective mirror 11 reflects are polarized vertically by what KTP-OPO system generated
The coupled mirror 8 of 1064nm laser and beam of flat polarization collinearly enter BaGa4Se7Difference frequency is carried out in crystal 12 generates intermediate infrared radiation,
The intermediate infrared radiation that difference frequency generates meets the saturating harmonic wave mirror 13 of the anti-3-5 μm of height of 1064nm&1300-1550nm high through special plated film and filters
Wave is to exclude remaining pumping interference.
Computer 14 connects the ktp crystal 6 and BaGa in KTP-OPO by data collecting card4Se7The galvanometer of crystal 12
Rotating platform, at the same control galvanometer rotating platform rotate two crystal angles can change KTP-OPO output wavelength and
BaGa4Se7The beat frequency phase matching condition of crystal, and then realize the intermediate infrared radiation wavelength tuning that difference frequency generates.
Of the invention for the fast tunable intermediate infrared radiation source device based on exocoel difference frequency is by means of red in novel
Outer crystal BaGa4Se7Crystal 12, while tunable near-infrared ideler frequency light and 1064nm laser pump are generated using single resonance KTP-OPO
What Pu was realized, including following procedure: it is inclined to generate the 1064nm line of polarization direction along the vertical direction using Nd:YAG Q-switched laser 1
Shake light, the first 2 articles of 1064nm half-wave plate adjustment laser polarization state and the frequency multiplication KTP crystalline substance for being incident on the II type-Ⅱphase matching condition that meets
In body 3, the 532nm laser of polarization state along the vertical direction is generated through frequency multiplication, 532nm laser is reflected into through the one 45 ° of high reflective mirror 4
Enter OPO system, is placed in pump cavity on the ktp crystal 6 above electronic galvanometer rotating platform, crystal is as parametric gain crystal
It can produce the tunable ideler frequency light of the polarization state that a branch of wavelength is 1.3-15.55 μm along the vertical direction, crystal is controlled by galvanometer
It rotates angle to realize that wavelength quickly tunes.Remaining 1064nm pump light after frequency multiplication after half-wave plate adjustment polarization with KTP-
The tunable ideler frequency light and beam for the cross-polarization that OPO is generated are incident to novel middle infrared crystal BaGa4Se7Difference frequency is carried out in crystal,
Crystal by galvanometer control rotation angle to meet beat frequency phase matching condition, due to the crystal have biggish nonlinear factor,
Therefore the form that can be pumped with exocoel difference frequency single realizes infrared output in efficiently, and in avoiding in infrared OPO for chamber
The particular/special requirement of mirror plated film.The voltage on galvanometer rotary system is controlled simultaneously by computer, to realize intermediate infrared radiation wave
Long quick tuning.
The specific embodiment of fast tunable intermediate infrared radiation source device based on exocoel difference frequency of the invention is embodied in
In fast tunable intermediate infrared radiation source device based on exocoel difference frequency as shown in Figure 1.Using device as shown in Figure 1, benefit
It is pumped jointly with the 1064nm laser of the tunable ideler frequency light of KTP-OPO system generation high-energy and cross-polarization infrared in novel
Crystal BaGa4Se7Crystal realizes infrared output in efficiently by exocoel difference frequency single pump mode, rotates system in combination with galvanometer
System, may be implemented in infrared output quick tuning.
The present invention utilizes nonlinear optical frequency conversion principle, meets II the special of type-Ⅱphase matching condition of DFG process and cuts
Angle BaGa4Se7Crystal, in the tunable ideler frequency that the frequency multiplication residue of cross-polarization pumps 064nm laser and generated by KTP-OPO
Under optical pumping, infrared output in tunable is realized by way of exocoel difference frequency single pumps, is controlled simultaneously in combination with computer
The output wavelength and BaGa of KTP-OPO4Se7Crystalline phase matching angle realizes that the wavelength of intermediate infrared radiation quickly tunes.Through can
Tuning, apparatus of the present invention have it is compact-sized flexibly, it is tunable, it is easy to accomplish the advantages that, can be used for remote sensing monitoring and in it is red
External spectrum detection.
Apparatus of the present invention structure is as shown in Figure 1, due to BaGa4Se7Crystal has biggish nonlinear factor, therefore passes through
Exocoel difference frequency single pumping form can be realized efficiently in infrared output, when cross-polarization high-energy 1064nm laser with by
The tunable ideler frequency light that KTP-OPO is generated is after coupling mirror 8 and beam, into BaGa4Se7In crystal 12, wherein in KTP-OPO
Ktp crystal 6 and BaGa4Se7Crystal 12 have computer 14 control its rotate angle with change its angular phase matching condition into
And realize the quick tuning of wavelength, BaGa4Se712 corner cut of crystal meets II type-Ⅱphase matching condition of optical parametric oscillator,
I.e.
νMIR=ν1064nm+νKTP-OPO-idler
A branch of wavelength intermediate infrared radiation is generated, this beam mid-infrared laser and the conllinear transmission of dual wavelength pumping, by harmonic wave mirror
After 13 filtering, mid-infrared laser output can be obtained.Herein basis on, by computer 14 change be applied to ktp crystal 6 with
And BaGa4Se7Voltage in 12 rotating platform system of crystal, can the accurate output wavelength and exocoel difference frequency for controlling KTP-OPO
Phase-matching condition, and then the intermediate infrared radiation of tunable wave length can be obtained.In view of BaGa4Se7The nonlinear factor of crystal
And dual wavelength pump intensity, BaGa4Se7Thickness L of the crystal 12 in direction of beam propagation also needs to optimize (this hair
Bright middle L=6mm) to avoid the inverse transformation process in exocoel difference frequency.
The foregoing is merely the preferred embodiments of the invention, are not intended to limit the invention creation, all at this
Within the spirit and principle of innovation and creation, any modification, equivalent replacement, improvement and so on should be included in the invention
Protection scope within.
Claims (9)
1. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency, it is characterised in that: pumping source uses Nd:
YAG Q-switched laser；Pump light frequency-doubling crystal uses ktp crystal, and frequency-doubling crystal corner cut meets II type-Ⅱphase matching condition, exocoel
Difference frequency crystal is BaGa4Se7Crystal, crystal corner cut are θ=55.8 °,8 × 8 × 6mm of crystalline size3, to side into
Row optical polish, crystal are placed on rotatable galvanometer platform, are connected with computer, adopt to computerized control and change BaGa4Se7
The applied voltage of ktp crystal in crystal and KTP-OPO, to realize KTP-OPO wavelength and difference frequency output intermediate infrared radiation
Wavelength quickly tune.
2. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 1, feature
Be: the laser is neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched laser, and output wavelength 1064nm, pulsewidth is ns amount
Grade, polarization state is the linearly polarized light polarized along the vertical direction.
3. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 2, feature
It is: further includes the focus lens group for receiving the laser emitting light, the first 1064nm half-wave plate is arranged in focus lens group
Later, for adjusting the polarization state of 1064nm laser to meet II type-Ⅱphase matching condition in frequency multiplication ktp crystal.
4. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 3, feature
Be: the frequency multiplication ktp crystal, corner cut are θ=90 °,15 × 15 × 10mm of size3For to 1064nm
Laser freuqency doubling generates high-energy 532nm laser, and the 532nm laser of generation is the linearly polarized light polarized along the vertical direction, generation
Green light is reflected into KTP-OPO system by the one 45 ° of high reflective mirror, pumps OPO system.
5. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 4, feature
Be: the one 45 ° of high reflective mirror carries out special plated film and meets 532nm and 1300~1500nm high instead, 400~500nm and
Remaining 1064nm fundamental frequency light reflects 1064nm high through the 2nd 45 ° of high reflective mirror thoroughly, and adjusts and polarize through the 2nd 1064nm half-wave plate
State is reflected to horizontal polarization, then through the 3rd 45 ° of high reflective mirror.
6. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 5, feature
Be: the KTP-OPO uses single-pass structure, including the first hysteroscope, ktp crystal and the second hysteroscope, can produce vertical polarization
Ideler frequency light that state is tunable, wherein the first hysteroscope plated film meets 532nm high, 800-900nm high is anti-thoroughly, and the second hysteroscope plated film meets
Thoroughly, ktp crystal, crystal corner cut is θ=62 ° to the anti-1300-1550nm high of 532nm&800-900nm high,Size 10 ×
10×15mm3, optical polish is carried out to side and carry out special plated film meet 532nm, 700~900nm and 1300~
1550nm wave band is high thoroughly.
7. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 6, feature
It is: polarizes tunable ideler frequency light and the horizontal polarization after the 3rd 45 ° of high reflective mirror reflects vertically by what KTP-OPO system generated
The coupled mirror of 1064nm laser and beam collinearly enter BaGa4Se7Difference frequency is carried out in crystal and generates intermediate infrared radiation, and difference frequency generates
Intermediate infrared radiation meet the saturating harmonic wave mirror of the anti-3-5 μm of height of 1064nm&1300-1550nm high through special plated film and filter to exclude to remain
Remaining pumping interference.
8. a kind of fast tunable intermediate infrared radiation source device based on exocoel difference frequency according to claim 7, feature
Be: the computer connects ktp crystal and BaGa in KTP-OPO by data collecting card4Se7The galvanometer of crystal rotates
Platform, while controlling galvanometer rotating platform two crystal angles of rotation and can change the output wavelength and BaGa of KTP-OPO4Se7
The beat frequency phase matching condition of crystal, and then realize the intermediate infrared radiation wavelength tune that difference frequency generates.
9. a kind of realization side of fast tunable intermediate infrared radiation source device based on exocoel difference frequency using the claims
Method, it is characterised in that: including following procedure: the 1064nm of polarization direction along the vertical direction is generated using Nd:YAG Q-switched laser
Linearly polarized light adjusts laser polarization state through the first 1064nm half-wave slip and is incident on the frequency multiplication for the II type-Ⅱphase matching condition that meets
In ktp crystal, the 532nm laser of polarization state along the vertical direction is generated through frequency multiplication, 532nm laser is anti-through the one 45 ° of high reflective mirror
It injects into OPO system, is placed on the ktp crystal above electronic galvanometer rotating platform in pump cavity, crystal generates a branch of wavelength
For the tunable ideler frequency light of 1.3-15.55 μm of polarization state along the vertical direction, crystal controls it by galvanometer and rotates angle to realize
Wavelength quickly tunes, and the remaining 1064nm pump light after frequency multiplication generates after half-wave plate adjustment polarization with KTP-OPO orthogonal inclined
The tunable ideler frequency light and beam of vibration, which are incident in novel middle infrared crystal BaGa4Se7 crystal, carries out difference frequency, and crystal is controlled by galvanometer
Angle is rotated to meet beat frequency phase matching condition, the voltage on galvanometer rotary system is controlled simultaneously by computer, thus real
The quick tuning of existing intermediate infrared radiation wavelength.
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|---|---|---|---|---|
| CN107425407A (en) * | 2017-08-28 | 2017-12-01 | 天津大学 | Based on inner chamber from the tunable blue ray radiation source of frequency multiplication and implementation method |
| CN209929676U (en) * | 2019-04-28 | 2020-01-10 | 天津市智慧物联信息技术研究院 | Fast tunable intermediate infrared radiation source device based on external cavity difference frequency |
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2019
- 2019-04-28 CN CN201910351725.8A patent/CN109888607A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425407A (en) * | 2017-08-28 | 2017-12-01 | 天津大学 | Based on inner chamber from the tunable blue ray radiation source of frequency multiplication and implementation method |
| CN209929676U (en) * | 2019-04-28 | 2020-01-10 | 天津市智慧物联信息技术研究院 | Fast tunable intermediate infrared radiation source device based on external cavity difference frequency |
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| YIXIN HE ET AL.: "High energy and tunable mid-infrared source based on BaGa4Se7 crystal by single-pass difference-frequency generation" * |
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