CN1753260A - Multi wave length simultaneously output full solid state tunnable laser light source - Google Patents
Multi wave length simultaneously output full solid state tunnable laser light source Download PDFInfo
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Abstract
This invention relates to a multi-wavelength laser source outputting total solid tunable laser at the same time including a first level pump source, a first level coupled system, a second level pump source, a second coupled system and an optical parameter oscillation cavity, among which, the first level pump source includes a plane-plane cavity structure composed of a first plane mirror and a second plane mirror, a switch device modulating fundamental optics, an initial optical pump source, a harmonic reflecting mirror and a SHG crystal are set between the two plane mirrors orderly from the first one, the resonator of the second level source is composed of a third, fourth and fifth plane mirrors, a Ti gem crystal is set at the focal point of the first coupled lends and a prism is set between the third and fourth plane mirrors and the Ti gem crystal, the optical parameter oscillator is composed of a back mirror and an output mirror, a PPLN crystal is set near the focal point of the second coupled lens.
Description
Technical field
The present invention relates to a kind of LASER Light Source, relate in particular to a kind of multi wave length simultaneously output full solid state tunnable laser light source.
Background technology
Present tunable optical source mostly is single wavelength, dual wavelength or broad band running, but, at many key areas such as optical communication, photodynamics medical treatment, photometry calculation, nonlinear frequency transformation, military confrontation, environmental monitoring, laser remote sensing, laser radar and spectroscopy researchs, often wish that a laser can export the tunable laser of two or more wavelength simultaneously.
Application number is 94119042, and name is called the patent of " multiple wavelength optical parameter laser ", utilizes the angle tuning phase region of nonlinear optical crystal in the optical parameter process to join reentry phenomenon.Regulate the coupling angle of nonlinear crystal, produce the parameter laser of different frequency.According to the technical scheme that this patent provides, the coherent light that can only obtain four different frequencies in catadioptric district simultaneously constitutes multiple wavelength optical parameter laser.
Application number is 01106708, it is a kind of all solid state laser that name is called " multiple wavelength solid laser ", have compact conformation, stable performance, simple to operate, advantage that conversion efficiency is high, but the 208nm ultraviolet light that its 415nm that can realize and frequency multiplication obtain there is not using value in the air pollution context of detection.
Application number is 01119589, and name is called " a kind of multiple-wavelength laser of acousto-optic Q modulation ", has adopted five blocks of laser crystals to realize a plurality of fundamental frequency light outputs, also needs to adopt in addition frequency-doubling crystal, and this can give the system construction complexity, increases unsteadiness, is not easy to operation.
Application number is 03125088, name be called " continuous wave laser that multi-wavelength turns round simultaneously " patent disclosure the continuous wave laser that turns round simultaneously of a kind of multi-wavelength, use a laser to realize the running of three kinds of fundamental frequency wavelength simultaneously, and then on same laser, realize the output of red, green, blue tricolor laser simultaneously by the frequency multiplication mode.This patent only realizes three visible wavelengths of red, green, blue, and because a kind of laser of continuous running, power output is restricted.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, proposes a kind of all solid state laser power level height, simple and compact for structure and volume is little, all solid state tunable laser source that multi-wavelength is exported simultaneously.
The technical solution used in the present invention is: a kind of multi wave length simultaneously output full solid state tunnable laser light source comprises the one-level pumping source, one-level coupled system, diode pumping source, secondary coupled system, optics parametric oscillator (opo).The one-level pumping source comprises the flat-flat cavity configuration that is made of first level crossing (M1) and second level crossing (M2), is provided with the switching device (Q) that fundamental frequency light is modulated, initial optical pump source, harmonic reflection mirror and frequency-doubling crystal successively from first level crossing (M1) beginning between first level crossing (M1) and second level crossing (M2).The one-level coupled system comprises first coupled lens, is coupled into the resonant cavity in diode pumping source in order to the pump light that the one-level pumping source is produced.The resonant cavity in diode pumping source is by the 3rd, the 4 two level crossing (M3, M4) and the 5th level crossing (M5) constitute, focus place at above-mentioned first coupled lens (L1) is provided with titanium gem crystal, the 3rd, the 4 two level crossing (M3, M4) and be provided with prism between the titanium gem crystal.The secondary coupled system comprises second coupled lens (L2), is coupled into optics parametric oscillator (opo) in order to the pump light that the diode pumping source is produced.Optics parametric oscillator (opo) is made of back mirror (M6) and outgoing mirror (M7), and PPLN (periodically poled lithium niobate) crystal is set near second coupled lens (L2) focus
Wherein,
Initial optical pump source is the diode laser matrix according to triangular arranged, employing side-pumping mode pumping laser medium, laser medium is Nd:YAG, be of a size of φ 3 * 80mm, the plane is worn at two ends, the anti-reflection film of plating fundamental frequency light provides cooling by the cooling water that flows to diode laser matrix and laser medium.
Frequency-doubling crystal is a ktp crystal, adopts II class phase matched, and cutting angle is θ=90 °, and φ=23.6 ° are of a size of 6 * 6 * 10mm, the anti-reflection film of two sides plating fundamental frequency light and frequency doubled light.
The central axis of titanium gem crystal is perpendicular to crystallographic axis, have two logical light end faces with the Brewster's angle cutting, and the normal of described two logical light end faces all is in the same plane with crystallographic axis, and the polarization direction of the pump light in the Brewster plane of incidence is consistent with crystallographic axis.
Titanium gem crystal optical direction length is 15mm, and the cross section is that the length of side is the square of 5mm.
(M3, locus M4) all can be regulated to constitute the third and fourth two level crossings of diode pumping source resonant cavity.
The polarization cycle of PPLN crystal is 20.5um, and its end face plating 750～850nm and OPO output wave band plating anti-reflection film are fixed in the temperature controlling stove, and the temperature controlling stove temperature can change to 473K continuously at normal temperature.
As prioritization scheme further:
First level crossing (M1) plating 1064nm high-reflecting film;
The repetition rate of switching device (Q) is 5kHz, plating 1064nm anti-reflection film;
Harmonic reflection mirror plating 1064nm anti-reflection film and 532nm high-reflecting film;
Constitute the third and fourth two level crossings (M3, M4) plating 700～900nm high-reflecting films of resonant cavity;
Constitute the 5th level crossing (M5) the plating 532nm high-reflecting film of resonant cavity, the pellicle of plating 700～900nm, transmitance is 20%;
The high-reflecting film of back mirror (M6) plating 750～850nm and OPO output wave band;
Outgoing mirror (M6), radius of curvature are 60mm, the pellicle of plating 750～850nm high-reflecting film and OPO output wave band, and transmitance is about 15%.
The beneficial effect that the present invention brought:
(1) the present invention all adopts full solid-state device, and its compact conformation, firm and durable, price are lower.
(2) the one-level pump arrangement adopts LD as original pumping source, and frequency-doubling crystal is KTP, carries out frequency modulation(FM) to realize the quasi continuous operation of high-peak power with acoustooptic Q-switching.
(3) pulsewidth of the titanium precious stone laser that produced of diode pumping device is compared with the pump light that the one-level pumping source is produced and can be reduced an order of magnitude, has greatly improved peak power, is the desirable pumping source of PPLN parametric oscillator.
(4) utilize titanium jewel dual laser wavelength pumping PPLN-OPO, utilize the wavelength tuning curve to have the rotating characteristic of ε type, do not change the polarization cycle of PPLN, the dual wavelength pumping can realize 4 groups of flashlights and ideler frequency light totally eight wavelength, consider two bundle pump lights again, acquisition covers the high power of 0.7～5 μ m, 10 wavelength of high light beam quality are exported tunable optical source simultaneously.
Description of drawings
Fig. 1 is overall structure figure of the present invention
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Overall structure figure of the present invention as shown in Figure 1.M1 is the 1064nm total reflective mirror, and M2 is the 532nm pump light outgoing mirror of ti sapphire laser, and 1064nm light is all-trans, and is high saturating to 532nm light.M1, M2 forms the green glow pumping source of ti sapphire laser, adopts to have gain height, the straight chamber of the bulky tradition of laser medium internal mode type Ping-Ping cavity configuration, and whole resonant cavity length is decided to be 330mm.The initial optical pump source of high power semiconductor array laser conduct that adopts Semiconductor institute, Chinese Academy of Sciences to produce, be diode laser matrix according to triangular arranged, employing side-pumping mode pumping laser medium, four group of three stripe laser diode bar is arranged in around the YAG rod symmetrically, equably pumping active medium YAG rod.The diode that every group of diode bars is 200mW by 100 power is formed, the diode continuous operation, and total Maximum pumping is 240W.Whole pumping assembly (comprising laser diode and YAG rod) provides cooling by the cooling water that flows.Laser medium is of a size of φ 3 * 80mm, and the plane is worn at two ends, the anti-reflection film of plating 1064nm.Acoustooptic Q-switching is produced by Britain GOOCH company, and wherein crystal is the fused quartz of φ 8 * 10 * 50mm, and driving power is 100W, operating frequency is 27MHz, and diffraction efficiency is 20%, and its modulating frequency is 1～50kHz, effectively clear aperture 15 * 15mm plates the 1064nm anti-reflection film.Harmonic reflection mirror is high saturating to 1064nm light, and is high anti-to 532nm light, to improve frequency-doubling conversion efficiency.Ktp crystal adopts II class phase matching angle cutting (θ=90 °, φ=23.6 °), is of a size of 6 * 6 * 10mm, the anti-reflection film of two sides plating 532nm and 1064nm.
In order to make 532nm pump light and titanium jewel oscillation light pattern better matching, obtain higher power density, use a focal length pump light to be converged in the titanium jewel chamber as the condenser lens L1 of 150mm, titanium gem crystal is placed on the focus place of pump light light beam.Titanium gem crystal optical direction length is 15mm, and the cross section is that the length of side is the square of 5mm.The central axis that makes the titanium gem stick is perpendicular to crystallographic axis c, and two logical light end faces cut with Brewster's angle, and the normal and the crystallographic axis c of two logical optical surfaces are in the same plane.The polarization direction of the pump light in the Brewster plane of incidence is consistent with the c axle.Adopt average chamber to form the resonant cavity of titanium precious stone laser, the chamber is about 200mm, and crystal probably is placed on the center in chamber.M3, M4 total reflective mirror are 700～900nmHR, and the outgoing mirror plated film is at 700～900nm, and transmitance is 25%.By adjusting the position of M3, M4 total reflective mirror, realize that tunable dual wavelength exports synchronously.
M, M ' are the total reflective mirrors of titanium jewel wave band, to reduce the volume of whole experiment device.L2 is the condenser lens of focal length 100mm, to improve the power density of titanium jewel pump light.M6 is a mirror behind the OPO, to titanium jewel running wave band 750～850nm and OPO output wave band plating high-reflecting film.M7 is the OPO outgoing mirror, and radius of curvature is 60mm, and to titanium jewel wave band plating high-reflecting film, the transmitance of OPO being exported wave band is about 15%.Whole optical parametric oscillator chamber is about and is 80mm.The polarization cycle of the PPLN crystal that adopts is 20.5um, makes its working temperature under 200 ℃.The PPLN crystal end-face is to pump light 750～850nm and OPO output wave band plating anti-reflection film.Utilize the wavelength tuning curve to have the rotating characteristic of ε type, the double pumping action wavelength pumping PPLN-OPO of ti sapphire laser output, realize 4 groups of flashlights and ideler frequency light totally eight wavelength, consider two bundle pump lights again, acquisition covers the high power of 0.7～5 μ m, 10 wavelength of high light beam quality are exported tunable optical source simultaneously.The multi-wavelength tunable light source of this kind wave-length coverage especially has advantage for aspects such as being applied in the air pollution detection.
Need to prove, here the detailed explanation that has been center deployment with embodiments of the invention, the imbody of described optimal way or some characteristic, should be understood to this specification only is to describe invention by the mode that provides embodiment, in fact on some details of forming, construct and using, can change to some extent, comprise the combination and the assembly of parts, these distortion and application all should belong in the scope of the present invention.
Present embodiment adopts all solid state, the quasi-continuous 532nm frequency multiplication Nd:YAG laser (stage arrangement) of diode laser pumped as initial optical pump source, pulse duration is less than 80ns, repetition rate 5kHz, the pumping titanium gem crystal is as the resonant cavity (secondary device) of laser medium, adopt prism as tuned cell, constitute all solid state, quasi-continuous tunable ti sapphire laser, repetition rate 5kHz, live width 2nm, laser pulse width is less than 20ns.With tunable titanium precious stone laser pumping PPLN optical parametric oscillator (three stage arrangements), adopt to change the novel tuning manner of pumping wavelength, utilize the ε type of the PPLN optical parametric oscillator tuning curve characteristic of turning back, obtain the output of 1～3um broad tuning.
Theoretical Calculation according to the multi wave length simultaneously output full solid state tunnable laser light source that present embodiment is realized, when the dual wavelength output tunable laser that adopts near the 770～820nm scope of all solid state ti sapphire laser gain centre wavelength (795nm), when the pumping polarization cycle is the single order conllinear PPLN-OPO of 20.5 μ m, adopt the novel tuning manner that changes pumping wavelength, its wavelength tuning curve has ε type gyroscopic characteristics, promptly under the constant situation of polarization cycle, 1 pump light can make 2 groups of signals and ideler frequency light satisfy phase-matching condition, can obtain the coherent light output of 4 wavelength, the dual wavelength pumping can realize 8 wavelength outputs, its spectral coverage is 0.9～5 μ m, if consider the tunability of dual wavelength running ti sapphire laser, whole system can obtain the high power of 0.7～5 μ m, 10 wavelength of high light beam quality are exported tunable optical source simultaneously.
Multi-wavelength of the present invention is exported tunable laser source simultaneously and be can be used as signal source, signal converter or amplifier in the optical communication wavelength-division multiplex system; Aspect environmental monitoring, the tunable optical source that the multi-wavelength exports simultaneously can fully satisfy the atmospheric window condition, can aim at the absworption peak of different Atmospheric components, with this high s/n ratio that obtains to optimize, carries out the high accuracy Atmospheric components and detects; In fields such as space remote sensing, atmospheric opticss, the DIAL (DIAL) of the tunable laser source development of exporting simultaneously based on the multi-wavelength has very high resolution; At military aspect, multi-wavelength is exported the guardian technique that tunable laser source has become fields, military forward position such as electrooptical countermeasures, laser blinding, laser communication simultaneously.
Claims (8)
1, a kind of multi wave length simultaneously output full solid state tunnable laser light source comprises the one-level pumping source, the one-level coupled system, and the diode pumping source, the secondary coupled system, optics parametric oscillator (opo) is characterized in that:
Described one-level pumping source comprises the flat-flat cavity configuration that is made of first level crossing (M1) and second level crossing (M2), is provided with the switching device (Q) that fundamental frequency light is modulated, initial optical pump source, harmonic reflection mirror and frequency-doubling crystal successively from first level crossing (M1) beginning between first level crossing (M1) and second level crossing (M2);
Described one-level coupled system comprises first coupled lens, is coupled into the resonant cavity in diode pumping source in order to the pump light that the one-level pumping source is produced;
The resonant cavity in described diode pumping source is by the 3rd, the 4 two level crossing (M3, M4) and the 5th level crossing (M5) constitute, focus place at above-mentioned first coupled lens (L1) is provided with titanium gem crystal, the 3rd, the 4 two level crossing (M3, M4) and be provided with prism between the titanium gem crystal;
Described secondary coupled system comprises second coupled lens (L2), is coupled into optics parametric oscillator (opo) in order to the pump light that the diode pumping source is produced;
Described optics parametric oscillator (opo) is made of back mirror (M6) and outgoing mirror (M7), near second coupled lens (L2) focus the PPLN crystal is set.
2, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1, it is characterized in that, described initial optical pump source is the diode laser matrix according to triangular arranged, employing side-pumping mode pumping laser medium, laser medium is Nd:YAG, be of a size of φ 3 * 80mm, the plane is worn at two ends, and the anti-reflection film of plating fundamental frequency light provides cooling by the cooling water that flows to diode laser matrix and laser medium.
3, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1, it is characterized in that, described frequency-doubling crystal is a ktp crystal, adopt II class phase matched, cutting angle is θ=90 °, φ=23.6 ° are of a size of 6 * 6 * 10mm, the anti-reflection film of two sides plating fundamental frequency light and frequency doubled light.
4, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1, it is characterized in that, the central axis of described titanium gem crystal is perpendicular to crystallographic axis, have two logical light end faces with the Brewster's angle cutting, and the normal of described two logical light end faces all is in the same plane with crystallographic axis, and the polarization direction of the pump light in the Brewster plane of incidence is consistent with crystallographic axis.
5, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1 is characterized in that, titanium gem crystal optical direction length is 15mm, and the cross section is that the length of side is the square of 5mm.
6, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1 is characterized in that, (M3, locus M4) all can be regulated to constitute the third and fourth two level crossings of described diode pumping source resonant cavity.
7, multi wave length simultaneously output full solid state tunnable laser light source according to claim 1, it is characterized in that, the polarization cycle of described PPLN crystal is 20.5um, its end face plating 750～850nm and OPO output wave band plating anti-reflection film, be fixed in the temperature controlling stove, the temperature controlling stove temperature can change to 473K continuously at normal temperature.
8, according to any described multi wave length simultaneously output full solid state tunnable laser light source of claim 1 to 7, it is characterized in that described first level crossing (M1) plating 1064nm high-reflecting film;
The repetition rate of described switching device (Q) is 5kHz, plating 1064nm anti-reflection film;
Described harmonic reflection mirror plating 1064nm anti-reflection film and 532nm high-reflecting film;
Constitute the third and fourth two level crossings (M3, M4) plating 700～900nm high-reflecting film of described resonant cavity;
Constitute the 5th level crossing (M5) the plating 532nm high-reflecting film of described resonant cavity, the pellicle of plating 700～900nm, transmitance is 20%;
The high-reflecting film of back mirror (M6) plating 750～850nm and OPO output wave band;
Outgoing mirror (M6), radius of curvature are 60mm, the pellicle of plating 750～850nm high-reflecting film and OPO output wave band, and transmitance is about 15%.
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| CN100454690C (en) * | 2007-04-11 | 2009-01-21 | 北京光电技术研究所 | Apparatus and method for harmonizing multi-wavelength laser output |
| CN102332673A (en) * | 2011-08-05 | 2012-01-25 | 厦门大学 | Mid-infrared light source based on acousto-optic effect and optical fibre amplifier |
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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 |
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| CN1036556C (en) * | 1994-12-26 | 1997-11-26 | 中国科学院物理研究所 | multi-wavelength optical parametric laser |
| CN1129217C (en) * | 2001-01-12 | 2003-11-26 | 中国科学院西安光学精密机械研究所 | Multiple wavelength solid laser |
| CN2588633Y (en) * | 2002-11-28 | 2003-11-26 | 中国科学院安徽光学精密机械研究所 | Ultraviolet multi-band laser device |
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| CN102332670A (en) * | 2011-08-05 | 2012-01-25 | 厦门大学 | Tunable mid-infrared light source based on electrooptic effect and optical fiber amplifier |
| CN103368055A (en) * | 2012-03-30 | 2013-10-23 | 通快激光与系统工程有限公司 | Device for amplifying a laser beam |
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| CN104167659B (en) * | 2014-09-05 | 2017-02-15 | 山西大学 | Method for adjusting mode matching of pump light and single-resonance optical parameter cavity |
| CN104167659A (en) * | 2014-09-05 | 2014-11-26 | 山西大学 | Method for adjusting mode matching of pump light and single-resonance optical parameter cavity |
| CN104362506A (en) * | 2014-11-25 | 2015-02-18 | 中国工程物理研究院应用电子学研究所 | Dual-waveband multi-wavelength infrared light parametric oscillator |
| CN104409962A (en) * | 2014-11-28 | 2015-03-11 | 江苏天元激光科技有限公司 | Diode end face pumping all-solid-state ultraviolet laser |
| CN106160872A (en) * | 2015-04-28 | 2016-11-23 | 中国移动通信集团广东有限公司 | A kind of adjustable multi-wavelength light module and the production method of multiwavelength laser signal |
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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 |
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