CN205752970U - A kind of mid-infrared parameter oscillator of lath pumping - Google Patents
A kind of mid-infrared parameter oscillator of lath pumping Download PDFInfo
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Abstract
This utility model provides the mid-infrared parameter oscillator of a kind of lath pumping, and the program includes seed laser, slab amplifier, beam shaping system and PPLN OPO system；The pump light that seed laser sends exports after sequentially passing through slab amplifier, beam shaping system and PPLN OPO system；Pump light includes near infrared signal light, mid-infrared ideler frequency light, near-infrared ideler frequency light.The program improves optimization for the match parameter of existing pumping type of laser and parameter and OPO, use seed light after lath power calibration amplifies, by the beam shaping of coupled system, then pumping PPLN OPO, it is achieved the mid-infrared laser output of high efficiency high-power and high-lighting beam quality.
Description
Technical field
The present invention relates to laser application technology, the mid-infrared parameter oscillator of a kind of lath pumping.
Background technology
The mid-infrared laser of 3-5 μm is widely used in national defence, scientific research and the civil areas such as photoelectronic warfare, atmospheric monitoring, Molecular Spectroscopy, laser medicine.Constantly extending and going deep into recently as application, high efficiency, high power, the mid-infrared solid state laser of high light beam quality have vast potential for future development.Having benefited from solid state laser technological progress and the nonlinear crystal increased quality of maturation, optical parametric oscillator (OPO) based on frequency transformation is one of effective way of mid-infrared laser producing high efficiency, high power, high light beam quality.At present, what most widely used general, output was the highest is to use laser pump (ing) periodically poled lithium niobate (PPLN) crystal, it is thus achieved that the technology path of tunable mid-infrared laser output.
But mid-infrared OPO to high efficiency, high power, high light beam quality " three high " target evolution in, be but faced with many key issues be technically badly in need of and breaking through.Firstly, since limited by intrinsic photon efficiency, the photon efficiency of the mid-infrared laser produced by OPO is together decided on (equal to the inverse ratio of wavelength, the longest efficiency of middle infrared wavelength is the lowest) by pumping laser wavelength and mid-infrared laser wavelength.Therefore, improve pumping laser and be converted near infrared signal light and the overall efficiency of mid-infrared ideler frequency light, be conducive to promoting the efficiency that mid-infrared laser is final, reduce heat accumulation and the damage probability of nonlinear crystal, and then promote mid-infrared laser output, one of parameter index that therefore conversion efficiency is most crucial in being OPO system.The conversion efficiency of OPO is affected by many factors, such as OPO lumen type, pump power density, phase matched, pulse characteristic, inverse conversion effect etc., is mainly concerned with the optimization of pumping laser and OPO system matches parameter.Secondly, PPLN crystal and mid-infrared film layer antibody Monoclonal threshold value, and the output of mid-infrared laser is had a major impact by PPLN crystal thermal effect, topmost reason is to limit the pump power of laser, even if obtaining the highest conversion efficiency, limited due to pump power, it is also difficult to obtain the output of high-power mid-infrared laser.Finally, under the conditions of high-power operation, due to the degeneration of pumping laser beam quality, the heat effect of PPLN crystal, by the deterioration of the mid-infrared laser beam quality that causes OPO to produce, it is difficult to meet application demand.
In recent years, high power based on lath gain media, high light beam quality Solid State Laser have obtained tremendous development, pumping source for OPO provides a kind of new thinking and method, its many characteristic is to improve the conversion efficiency of mid-infrared OPO, output and beam quality to provide conveniently, provides technical support for realizing the target of mid-infrared laser " three high " simultaneously.
Summary of the invention
The purpose of the present invention, it is aiming at the deficiency existing for prior art, and the mid-infrared parameter oscillator of a kind of lath pumping is provided, the program improves optimization for the match parameter of existing pumping type of laser and parameter and OPO, use seed light after lath power calibration amplifies, by the beam shaping of coupled system, then pumping PPLN-OPO, it is achieved the mid-infrared laser output of high efficiency high-power and high-lighting beam quality.
This programme is achieved by the following technical measures:
The mid-infrared parameter oscillator of a kind of lath pumping, includes seed laser, slab amplifier, beam shaping system and PPLN-OPO system；The pump light that seed laser sends exports after sequentially passing through slab amplifier, beam shaping system and PPLN-OPO system；Pump light includes near infrared signal light, mid-infrared ideler frequency light, near-infrared ideler frequency light.
Preferred as this programme: PPLN-OPO system includes total reflective mirror, PPLN crystal and outgoing mirror；The pump light injected exports after sequentially passing through total reflective mirror, PPLN crystal and outgoing mirror.
Preferred as this programme: PPLN-OPO system includes reflecting mirror, dichroic mirror, PPLN crystal and outgoing mirror；The pump light injected injects PPLN crystal after dichroic mirror, sequentially passes through PPPLN crystal and outgoing mirror output；The light of outgoing mirror and PPLN crystal reflection reflexes to reflecting mirror through dichroic mirror, then is reflected back dichroic mirror by reflecting mirror；Reflecting mirror is coated with near infrared signal light and the high-reflecting film of mid-infrared ideler frequency light；The two-sided of PPLN incidence end is coated with pump light, near infrared signal light and mid-infrared ideler frequency light anti-reflection film；Dichroic mirror is coated with pump light anti-reflection film, near infrared signal light and mid-infrared ideler frequency light high-reflecting film；Outgoing mirror is partially reflective near infrared signal light, near infrared signal reflecting mirror thoroughly or is coated with light height thoroughly to mid-infrared ideler frequency light is high, partially reflective to mid-infrared ideler frequency light；Dichroic mirror is 45 ° with the angle of pump light.
Preferred as this programme: reflecting mirror can be replaced and be set to Bragg grating VBG；Described outgoing mirror is high anti-, high thoroughly to mid-infrared ideler frequency light near infrared signal light；Near-infrared ideler frequency light is exported by VBG.
Preferred as this programme: seed laser includes bar-shaped side pumping module, acousto-optic Q opens the light, pumping total reflective mirror, pumping outgoing mirror and polaroid；The pump light that bar-shaped pump module sends penetrates from its two ends, the pump light of one end injection exports through polaroid successively and pumping outgoing mirror, after the pump light of other end injection injects the reflection of pumping total reflective mirror after acousto-optic Q-switching, sequentially passing through acousto-optic Q-switching, bar-shaped side pumping module, polaroid and the output of pumping outgoing mirror.
The beneficial effect of this programme can be learnt according to the narration of such scheme, and the present invention compared with prior art, it is advantageous that:
(1) in order to obtain the optimal pump power density under the conditions of OPO high conversion efficiency, can be by design and the repetition rate of regulation seed light and pulse width, the pump light after lath amplifies is made to keep the pulse characteristic of seed light, thus realizing optimal pump power density, it is thus achieved that high efficiency mid-infrared laser exports.Compared with directly exporting pump light with by agitator, the technology path more motility of regulation seed optical pulse characteristic, amplification light path and the follow-up beam shaping system of lath need not readjust, and at high power, agitator directly exports the pulse characteristic of pump light and is limited by gain resonant cavity structure, it is difficult to realize the regulation of large range of repetition rate and pulse width.
(2) limited by PPLN crystal growth and processing technique, its thickness direction is the narrowest, pumping incident end face presents the rectangle of fillet, generally for more fully utilizing the effective coverage of PPLN crystal, ellipse light spot need to be become to carry out pumping more circular spot shaping.And the present invention uses slab laser to carry out pumping, the form of its output facula is also rectangle, by simple beam coupling system, can realize overlapping with the optimal of PPLN crystal incident end face effective coverage, improve the conversion efficiency of OPO system, at identical pumping power drop low PPLN damage probability, or under identical pump power density, bear higher pump power, be more beneficial for realizing the output of high-power mid-infrared laser.
(3) typically, the hot spot typically exported by agitator presents Gauss distribution (center is relatively strong, edge is more weak), for PPLN-OPO system, under high power pump, the power density in stronger region, its center is higher, easily causes the damage of PPLN crystal.In order to realize the PPLN-OPO of high conversion efficiency, when the edge power density of pump spot reaches optimum power intensity, its central area will exceed optimum power intensity, and produce inverse conversion effect, cause conversion efficiency to reduce.The pump light system that seed light is amplified through lath, the distribution of its hot spot is more uniform, it is to avoid pumping laser center strong point, reduces the damage probability of PPLN crystal, can be near optimum power intensity in whole pump spot, thus realize the mid-infrared laser output of high conversion efficiency.Meanwhile, the pump spot distribution without strong point, under identical PPLN damage threshold limits, higher pump power can be born, thus realize the output of high-power mid-infrared laser.
(4) slab laser has the outstanding advantages such as output height, good beam quality.The laser instrument (such as optical fiber laser etc.) of other technologies route relatively, for pulse working mode, hundreds of watts, under the output of the most thousands of watts, the laser more advantage of slab laser output.As the pumping laser of PPLN-OPO, its less angle of divergence, under the modulation of phase-matching condition, can obtain the mid-infrared laser output of preferable beam quality.
As can be seen here, the present invention compared with prior art, has prominent substantive distinguishing features and significantly progress, and its beneficial effect implemented also is apparent from.
Accompanying drawing explanation
Fig. 1 is the structural representation of the specific embodiment of the invention one.
Fig. 2 is a kind of structural representation of seed laser in Fig. 1.
Fig. 3 is the another kind of structural representation of PPLN-OPO system in Fig. 1.
In figure, 1 is seed laser, and 2 is slab amplifier, and 3 is beam shaping system, and 4 is PPLN-OPO system, 5 is total reflective mirror, and 6 is PPLN crystal, and 7 is outgoing mirror, and 8 is pumping total reflective mirror, and 9 open the light for acousto-optic Q, 10 is bar-shaped side pumping module, and 11 is polaroid, and 12 is pumping outgoing mirror, and 13 is dichroic mirror.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, in addition to mutually exclusive feature and/or step, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be by other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, an example during each feature is a series of equivalence or similar characteristics.
Detailed description of the invention one:
Seed laser 1 uses the gain crystal of the 808nm diode laser end pumping Nd doping of optical fiber coupling output, obtains several watts, beam quality factor M in the resonator cavity of folded form2< the basic mode 1.064 μm output of 1.5.Realizing impulse modulation at intracavity by acousto-optic Q-switching, by adjusting gain, chamber length, Q-switch parameter etc., the pulse frequency few kilohertz of seed laser is adjustable to kilohertz, and pulse width few tens of nano-seconds can design to hundreds of nanoseconds.By the control etc. of polarizer in the type selecting of Nd crystal, resonator cavity, seed laser realizes linear polarization output, to realize the phase matched of follow-up OPO system.
Slab amplifier system 2 is mainly made up of beam shaping and transmission system, shielding system, the Nd lath amplification module etc. of side pumping.Beam shaping and transmission system mainly by the spot size of seed laser and Adjusting Shape to the size and shape matched with lath gain media, effectively amplify extraction with realization.Shielding system is that the light echo preventing multi-pass amplifier is on seed laser parameter and the impact of performance.The Nd lath amplification module of side pumping is folded battle array, Nd slab crystal by the 808nm diode laser through shaping, heat sink and other optics form, and are the core components of slab amplifier system.According to the power demand amplified, slab amplifier system may be designed as single-pass or multi-pass amplifier, and the form of multiple slab amplifier concatenation, it is achieved the high-power laser of high light beam quality exports.Slab amplifier is while realizing power ascension, it is also possible to keep the pulse characteristic of seed laser.
Beam shaping system 3 is made up of polylith lens, the pumping laser of main high-power and high-lighting beam quality slab amplifier system 2 exported is shaped into the size matched with PPLN incident end face and OPO resonator cavity at PPLN crystal correct position, to make full use of the effective coverage of PPLN crystal, it is achieved the mid-infrared laser output of high efficiency high-power and high-lighting beam quality.
PPLN-OPO system 4 is that the mid-infrared laser that the pumping laser after amplifying realizes specific wavelength by nonlinear frequency transformation in PPLN crystal exports, and is generally made up of OPO resonator mirror, nonlinear crystal (containing temperature control fixture).For line chamber system, OPO total reflective mirror 5 is coated with pumping laser anti-reflection film, near infrared signal light and mid-infrared ideler frequency light high-reflecting film, PPLN crystal incidence Double End is coated with pumping laser, near infrared signal light and the anti-reflection film of mid-infrared ideler frequency light, OPO outgoing mirror 7 is partially reflective near infrared signal light, high thoroughly (corresponding to flashlight single resonance structure) to mid-infrared ideler frequency light, or high thoroughly near infrared signal light, partially reflective to mid-infrared ideler frequency light (corresponding to ideler frequency light single resonance structure).For ring cavity structure, can be made up of three pieces or four pieces of corresponding mirrors.PPLN crystal is placed among temperature control fixture, by changing its operating temperature, it is possible to achieve the tuning operation of mid-infrared laser wavelength.
Export to realize the mid-infrared laser of high efficiency high-power and high-lighting beam quality, need to control the power density of pumping laser, it is achieved the pumping of optimal threshold multiple, reduce inverse conversion effect；Make full use of the effective coverage of PPLN crystal, increase the pump power that PPLN crystal can bear, reduce its damage probability；Controlling the beam quality of high power pump laser, according to the phase matched restriction to the angle of divergence, and zlasing mode is chosen by resonator cavity, to obtain the mid-infrared OPO output of high light beam quality.
In sum, seed laser uses refrative cavity end-pumping structure, it is achieved several watts, beam quality factor M2< the 1.064 μm outputs of 1.5, then it is amplified to hundreds of watts through the calibration of lath gain module, after carrying out beam shaping by coupled system, pumping PPLN-OPO obtains the mid-infrared laser output of high efficiency high-power and high-lighting beam quality.
In the present embodiment, the volume of PPLN crystal is that 3mm(is thick) × 5mm(width) × 50mm(length), the optimal effective coverage of incident end face is that 2.4mm(is thick) × 4mm(width), the spot size of the pump light after the amplification of lath gain module is shaped as the size matched with the optimal effective coverage of PPLN crystal incident end face by beam shaping system 3 by battery of lens, and keeps the distribution of its hot spot the most uniform.OPO resonator cavity uses single resonance structure, is changed to pump light, causes conversion efficiency to reduce avoiding near infrared signal light and mid-infrared ideler frequency light under dual resonance structure to reverse in resonant process, output instability.The parameters such as OPO cavity resonator structure, the gain length of PPLN crystal and output wavelength substantially determine it and go out photo threshold, and on the premise of making full use of pump light spot size determined by PPLN effective coverage, in order to reach optimal pump power density (scales over threshold), need to regulate repetition rate and the pulse width of pump light.Owing to the calibration amplification characteristic of lath gain module is relevant to the pulse characteristic of seed laser, therefore the pump light optimum power intensity after power amplification can be realized by the repetition rate and pulsewidth adjusting seed laser.The pulse characteristic of seed laser, can carry out the regulation of repetition rate and pulse width by acousto-optic Q-switching, it is also possible to by parameter regulation pulse widths etc. such as Resonant Intake System and 808nm pump spot sizes.Its repetition rate few kilohertz of seed laser for using refrative cavity end-pumping structure is adjustable to kilohertz, and pulse width few tens of nano-seconds is adjustable to hundreds of nanoseconds.Therefore, lath amplifier system 2 need not regulated, beam shaping system 3, on the premise of PPLN-OPO system 4, it is adjusted merely by the parameter of seed laser 1, the regulation of pumping light power density large dynamic range can be realized so that it is away from the damage threshold of PPLN crystal, and reach optimal pump power density.
In the present embodiment, conversion efficiency total for PPLN-OPO is more than 60%, and total output is more than 150W, the beam quality factor M of near infrared signal light2< 5, reach the technical specification of high efficiency high-power and high-lighting beam quality, be the openest OPO reporting maximum power output.
Detailed description of the invention two:
Illustrating that present embodiment, present embodiment are with the difference described in embodiment one in conjunction with Fig. 1 and Fig. 2, seed laser 1 uses the line chamber system of bar-shaped side pumping module composition, as Fig. 2 illustrates.In figure, pumping total reflective mirror 8 is coated with 1.064 μm and is all-trans film, and pumping outgoing mirror 12 is coated with 1.064 μm laser part reflectance coatings, and they constitute the resonator cavity of seed laser.Acousto-optic Q-switching 9 realizes the impulse modulation to seed laser, and repetition rate few kilohertz is adjustable to kilohertz.The gain media of bar-shaped side pumping module 10 is diameter 2mm, length 106mm, the Nd:YAG rod of Uniform Doped, and the diode laser chips of 808nm is radiated at rod side uniformly.Polaroid 11 is put in resonator cavity, to ensure that seed laser realizes linear polarization output, thus realizes phase matched in follow-up PPLN-OPO system.This line chamber side pumping bar-shaped laser can realize several watts to tens of watts, beam quality factor M2< 2, pulse frequency is adjustable, the seed laser of linear polarization, and then is carried out the calibration amplification of power by slab amplifier.
Detailed description of the invention three:
In conjunction with Fig. 1, present embodiment is described, present embodiment is with the difference described in embodiment one, embodiment two, using 1mm pulse optical fiber as seed laser 1, the parameter such as repetition rate, pulse width, beam quality is similar with embodiment one.
Detailed description of the invention four:
Illustrate that present embodiment, present embodiment are to use refrative cavity structure, as shown in Figure 3 as PPLN-OPO system 4 with the difference described in embodiment one, embodiment two, embodiment three in conjunction with Fig. 1 and Fig. 3.Pump light is to amplify through lath, the 1.064mm laser that the optimal effective coverage of shaping and PPLN incident end face matches.Reflecting mirror 5 is coated with near infrared signal light and the high-reflecting film of mid-infrared ideler frequency light.The incident Double End of PPLN crystal 6 is coated with pumping laser, near infrared signal light and mid-infrared ideler frequency light anti-reflection film.Dichroic mirror 13 is coated with pumping laser anti-reflection film, near infrared signal light and mid-infrared ideler frequency light high-reflecting film.OPO outgoing mirror 7 is partially reflective near infrared signal light, high thoroughly (corresponding to flashlight single resonance structure) to mid-infrared ideler frequency light, or high thoroughly near infrared signal light, partially reflective to mid-infrared ideler frequency light (corresponding to ideler frequency light single resonance structure).
PPLN-OPO system 4 uses refrative cavity structure to be conducive in the case of heat effect is more serious, the coupling of implementation pattern in resonator cavity, obtain the mid-infrared OPO output of high light beam quality, can regulate OPO system goes out photo threshold simultaneously, and then regulate optimal pump power density, it is achieved the mid-infrared OPO output of high conversion efficiency.
Detailed description of the invention five:
Illustrate that present embodiment, present embodiment are substituting reflecting mirror 5 with the difference described in embodiment four with Bragg grating (VBG) in conjunction with Fig. 1 and Fig. 3.VBG is partially reflective to flashlight, the flashlight resonance that limit divergence angle is big simultaneously.OPO outgoing mirror 7 is high anti-near infrared signal light, and high thoroughly to mid-infrared ideler frequency light, mid-infrared laser is exported by OPO outgoing mirror 7, and near-infrared ideler frequency light is exported by VBG.Replace the refrative cavity structure in embodiment four with VBG, except having refrative cavity beam quality pattern match, in addition to optimal pump power density can design, the diffraction characteristic of VBG will improve the beam quality of OPO output further.When the angle of divergence of resonant laser light is more than VBG design load, reflectance will drastically reduce, and the loss of increase will not ensure that its resonance amplifies, and the effective resonance of luminous energy that the most only angle of divergence is less amplifies, it is ensured that the high light beam quality output of OPO.
The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any new feature disclosed in this manual or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (5)
1. a mid-infrared parameter oscillator for lath pumping, is characterized in that: include seed laser, slab amplifier, beam shaping system and PPLN-OPO system；The pump light that described seed laser sends exports after sequentially passing through slab amplifier, beam shaping system and PPLN-OPO system；Described pump light includes near infrared signal light, mid-infrared ideler frequency light, near-infrared ideler frequency light.
The mid-infrared parameter oscillator of a kind of lath pumping the most according to claim 1, is characterized in that: described PPLN-OPO system includes total reflective mirror, PPLN crystal and outgoing mirror；The pump light injected exports after sequentially passing through total reflective mirror, PPLN crystal and outgoing mirror.
The mid-infrared parameter oscillator of a kind of lath pumping the most according to claim 1, is characterized in that: described PPLN-OPO system includes reflecting mirror, dichroic mirror, PPLN crystal and outgoing mirror；The pump light injected injects PPLN crystal after dichroic mirror, sequentially passes through PPPLN crystal and outgoing mirror output；The light of described outgoing mirror and PPLN crystal reflection reflexes to reflecting mirror through dichroic mirror, then is reflected back dichroic mirror by reflecting mirror；Described reflecting mirror is coated with near infrared signal light and the high-reflecting film of mid-infrared ideler frequency light；The two-sided of described PPLN incidence end is coated with pump light, near infrared signal light and mid-infrared ideler frequency light anti-reflection film；Described dichroic mirror is coated with pump light anti-reflection film, near infrared signal light and mid-infrared ideler frequency light high-reflecting film；Described outgoing mirror is partially reflective near infrared signal light, near infrared signal reflecting mirror thoroughly or is coated with light height thoroughly to mid-infrared ideler frequency light is high, partially reflective to mid-infrared ideler frequency light；Described dichroic mirror is 45 ° with the angle of pump light.
The mid-infrared parameter oscillator of a kind of lath pumping the most according to claim 3, is characterized in that: described reflecting mirror can be replaced and be set to Bragg grating VBG；Described outgoing mirror is high anti-, high thoroughly to mid-infrared ideler frequency light near infrared signal light；Described near-infrared ideler frequency light is exported by VBG.
The mid-infrared parameter oscillator of a kind of lath pumping the most according to claim 1, is characterized in that: described seed laser includes bar-shaped side pumping module, acousto-optic Q opens the light, pumping total reflective mirror, pumping outgoing mirror and polaroid；The pump light that described bar-shaped pump module sends penetrates from its two ends, the pump light of one end injection exports through polaroid successively and pumping outgoing mirror, after the pump light of other end injection injects the reflection of pumping total reflective mirror after acousto-optic Q-switching, sequentially passing through acousto-optic Q-switching, bar-shaped side pumping module, polaroid and the output of pumping outgoing mirror.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514788A (en) * | 2016-01-25 | 2016-04-20 | 中国工程物理研究院应用电子学研究所 | Mid-infrared optical parameter oscillator of slab pump |
| CN106992426A (en) * | 2017-04-18 | 2017-07-28 | 华中科技大学 | A kind of intracavity pump optical parametric oscillator of Single-end output |
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2016
- 2016-01-25 CN CN201620066054.2U patent/CN205752970U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514788A (en) * | 2016-01-25 | 2016-04-20 | 中国工程物理研究院应用电子学研究所 | Mid-infrared optical parameter oscillator of slab pump |
| CN105514788B (en) * | 2016-01-25 | 2019-06-11 | 中国工程物理研究院应用电子学研究所 | A kind of mid-infrared parameter oscillator of lath pumping |
| CN106992426A (en) * | 2017-04-18 | 2017-07-28 | 华中科技大学 | A kind of intracavity pump optical parametric oscillator of Single-end output |
| CN106992426B (en) * | 2017-04-18 | 2019-09-13 | 华中科技大学 | A kind of intracavity pump optical parametric oscillator of Single-end output |
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