CN204290024U - Infrared ring light parametric oscillator in a kind of compact three chamber mirrors - Google Patents
Infrared ring light parametric oscillator in a kind of compact three chamber mirrors Download PDFInfo
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- CN204290024U CN204290024U CN201420781078.7U CN201420781078U CN204290024U CN 204290024 U CN204290024 U CN 204290024U CN 201420781078 U CN201420781078 U CN 201420781078U CN 204290024 U CN204290024 U CN 204290024U
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Abstract
The utility model provides the technical scheme of infrared ring light parametric oscillator in a kind of compact three chamber mirrors, and the program includes OPO pumping source, pumping coupling system and OPO annular chamber; Front coupled lens and rear coupled lens is provided with in pumping coupling system; Infrared outgoing mirror and nonlinear crystal in infrared outgoing mirror, OPO long wave is provided with in OPO speculum, OPO shortwave in OPO annular chamber.The program can realize OPO miniaturization, and what reduce laser goes out photo threshold, improves conversion efficiency, reduces the complexity of annular chamber, improves the reliability of OPO system, reduces the volume and weight of OPO system simultaneously.
Description
Technical field
The utility model relates to laser technique, infrared ring light parametric oscillator in especially a kind of compact three chamber mirrors.
Background technology
In the prior art, known technology is that the mid-infrared laser of 3-5 μm is widely used in national defence, scientific research and the civil areas such as electrooptical countermeasures, atmospheric monitoring, Molecular Spectroscopy, laser medicine.Along with the continuous expansion and deeply of application, there is infrared solid laser in certain power level, tunable, miniaturization and receive much concern in recent years.Optical parametric oscillator (OPO) based on frequency translation is one of the effective way producing high power, tunable mid-infrared laser.
OPO system is primarily of pump laser, coupling shielding system, nonlinear crystal resonant cavity mirror composition.And OPO is only made up of nonlinear crystal and chamber mirror, its structure is simple, compact, is very beneficial for developing to miniaturization.But its pump laser but relative complex and huge, is difficult to and OPO integration realization integral miniaturization.Along with the development of 1 μm and 2 μm Fiber laser technology, in the miniaturization of infrared OPO provide another kind of thinking, the fiber laser be about to as pumping source is separated with OPO integrated, thus realizes the miniaturization of OPO.
In line chamber OPO, in order to reduce threshold value, improve the conversion efficiency of pump light, outgoing mirror, usually to pumping laser reflection, makes pumping laser come and go and passes through nonlinear crystal.But in order to prevent light echo on the impact of pump laser, then must add shielding system between pump laser and OPO.This will increase the weight and volume of OPO, and the complexity of system.Especially, when OPO is near degeneracy wavelength, will there is serious inverse conversion effect in line chamber OPO, reduce the conversion efficiency of pump light.
In order to reduce inverse conversion effect, avoiding light echo on the impact of pumping laser, proposing the mentality of designing adopting annular chamber in miniaturized OPO.And miniaturized OPO is to the strict demand that proposes of volume, weight and reliability aspect, four common chamber mirror annular chambers (rectangle or X-type) are also not exclusively applicable, need to be optimized design for miniaturization specially, and this is the weak point existing for prior art.
Utility model content
The purpose of this utility model, be exactly for the deficiency existing for prior art, and the technical scheme of infrared ring light parametric oscillator in a kind of compact three chamber mirror two wavebands is provided, the program can realize OPO miniaturization, what reduce laser goes out photo threshold, improves conversion efficiency, reduces the complexity of annular chamber, improve the reliability of OPO system, reduce the volume and weight of OPO system simultaneously.
This programme is achieved by the following technical measures: infrared ring light parametric oscillator in a kind of compact three chamber mirrors, include the fiber laser as OPO pumping source and OPO system shell, it is characterized in that: in OPO system shell, include pumping coupling system and OPO annular chamber; Front coupled lens and rear coupled lens is provided with in pumping coupling system; Infrared outgoing mirror and nonlinear crystal in infrared outgoing mirror, OPO long wave is provided with in OPO speculum, OPO shortwave in OPO annular chamber; The laser beam that fiber laser sends enters OPO annular chamber through after front coupled lens and rear coupled lens successively; After laser beam passes OPO speculum and nonlinear crystal after entering OPO annular chamber successively, infrared outgoing mirror in directive OPO long wave; LONG WAVE INFRARED light in laser beam is through outgoing mirror injection OPO annular chamber infrared in OPO long wave, and the short-wave infrared light in laser beam reflexes in OPO shortwave through outgoing mirror infrared in OPO long wave and penetrates OPO annular chamber after infrared outgoing mirror.
Preferred as this programme: front coupled lens and the ratio of rear coupled lens focal length are the fibre core size of laser beam and expect the ratio of waist spot size.
Preferred as this programme: the distance between front coupled lens and fiber laser equals the focal length of front coupled lens.
Preferred as this programme: front coupled lens and rear coupled lens are coaxially placed, and described nonlinear crystal is placed in the focal position of rear coupled lens.
Preferred as this programme: fiber laser can output dual wavelength or multi-Wavelength Pulses laser.
Preferred as this programme: in OPO long wave, infrared outgoing mirror is plano-concave mirror, and has higher transmissivity to LONG WAVE INFRARED light, has higher reflectivity to the infrared light of other wavelength.
Preferred as this programme: in OPO shortwave, infrared outgoing mirror is plano-concave mirror, and has higher transmissivity to short-wave infrared light, has higher reflectivity to the infrared light of other wavelength.
The beneficial effect of this programme can be learnt according to describing of such scheme, owing to adopting two pieces of short focus lens combinations in this scenario, by optimizing focal length and the relative distance of two pieces of lens, the spot size of pumping laser, beam waist position, the angle of divergence etc. are realized optimum Match in OPO annular chamber, then realize modularization clamping, improve the reliability of OPO system.Adopt three chamber mirror ring cavity structures, reduce inverse conversion effect, improve conversion efficiency, avoid shielding system, reduce the volume of OPO system.Compared with four chamber mirror OPO annular chambers, what three chamber mirror OPO annular chambers reduced laser goes out photo threshold, improves conversion efficiency, reduces the complexity of annular chamber, improve the reliability of OPO system, reduce the volume and weight of OPO system simultaneously.In OPO shortwave, in infrared outgoing mirror and OPO long wave, infrared outgoing mirror adopts plano-concave mirror, effectively reduces OPO and goes out photo threshold, improve OPO conversion efficiency.By the filming parameter of design OPO two chamber mirrors, realize laser exports two kinds of different wave lengths respectively mid-infrared laser from two outlets.
As can be seen here, the utility model compared with prior art, has substantive distinguishing features and progress, and its beneficial effect implemented also is apparent.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, 1 is fiber laser, and 2 is front coupled lens, 3 is rear coupled lens, 4 is OPO annular chamber, and 5 is infrared outgoing mirror in OPO shortwave, and 6 is OPO system shell, 7 is infrared outgoing mirror in OPO long wave, 8 is nonlinear crystal, and 9 is OPO total reflective mirror, and 10 is pumping coupling system, 11 is short-wave infrared light, and 12 is LONG WAVE INFRARED light.
Embodiment
For the technical characterstic of this programme can be clearly demonstrated, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
In compact three chamber mirror two wavebands, infrared ring light parametric oscillator comprises: as the fiber laser 1 of pumping source, front coupled lens 2, rear coupled lens 3, infrared outgoing mirror 7 in infrared outgoing mirror 5, OPO long wave in OPO shortwave, nonlinear crystal 8, OPO total reflective mirror 9, pumping coupling system 10, annular chamber OPO4, OPO system shell 6.Pumping coupling system 10 is by front coupled lens 2, and rear coupled lens 3 forms, and their focal length and relative position all pass through strict setting, and in order to reduce system bulk, the length of pumping coupling system 10 reduces as far as possible.Annular chamber OPO4 is by outgoing mirror 5 infrared in OPO shortwave, OPO total reflective mirror 9, infrared outgoing mirror 7 in OPO long wave, nonlinear crystal 8 forms, in OPO long wave, infrared outgoing mirror 7 is 45 ° of placements, and in OPO long wave, the relative position of infrared outgoing mirror 5 and OPO speculum 9 and angle adjust according to concrete execution mode.
Embodiment one:
Fiber laser 1 as pumping source adopts 2mm pulse optical fiber, and repetition rate is that 1-100kHz is adjustable, pulse duration hundred nanosecond, adopts polarization maintaining optical fibre to realize linear polarization and exports, to reach the phase-matching condition of OPO.
The 2mm pulse laser that pumping coupling system 10 realizes fiber laser exports collimates and expands, front coupled lens 2, the two-sided anti-reflection film being all coated with 2mm of rear coupled lens 3.
ZGP crystal (the ZnGeP2 that nonlinear crystal 8 in annular chamber OPO5 annular chamber OPO4 adopts two pieces of optical axis directions staggered relatively, phosphorus germanium zinc), to walk from compensation under compensated birefringence phase matched, increase the gain length of optical parameter conversion simultaneously, reduce and photo threshold, improve conversion efficiency.OPO total reflective mirror 9 pairs of 2mm laser have high-transmission rate, have high reflectance, angled placement to the laser near 4mm.Laser in OPO shortwave near infrared outgoing mirror 5 couples of 4mm has high reflectance, has high-transmission rate, angled placement to 2mm laser.In OPO long wave, infrared outgoing mirror 7 pairs of 2mm laser have high reflectance, have partial reflectance to the laser near 4mm, become 45 degree of placements.By relative position and the angle of infrared outgoing mirror 5, OPO total reflective mirror 9 in adjustment OPO shortwave, realize the high-efficiency operation of three chamber mirror annular chamber OPO.By changing angle and the working temperature of ZGP crystal, the tuning of 3 ~ 5mm wave band can be realized.Laser near the 4mm that the optical parameter conversion comprising infrared outgoing mirror 7 output in OPO long wave in the laser that annular chamber OPO4 exports produces, and remaining non-switched 2 pumping lasers that in OPO shortwave, infrared outgoing mirror 5 exports.
After the system integration, the volume of OPO system shell 6 can control within 80mm × 80mm × 220mm, and weight is less than 2.5kg, and two waveband power output reaches tens of watts.
Embodiment two:
Composition graphs 1 illustrates present embodiment, present embodiment and the difference described in execution mode one are, nonlinear crystal adopts PPLN crystal (Periodically Poled Lithium Niobate, periodically poled lithium niobate), the logical light face of two, crystal is coated with the anti-reflection film of pumping laser and parameter laser.Because PPLN crystal is based on quasi-phase matched, there is not walk-off effect, therefore do not need bicrystal to carry out walking from compensation.By the polarization cycle (monocycle, multicycle, fan-shaped cycle, mixing cycle) of design PPLN crystal, incident angle and working temperature (usual room temperature is to 200 DEG C) etc., absorb in cut-off wave band meeting phase-matching condition and PPLN, the continuous precise that can realize near 1 ~ 4mm is tuning, and is expected to realize multiband (>=2) even the mid-infrared laser output of super continuous spectrums.
Embodiment three:
Composition graphs 1 illustrates present embodiment, present embodiment and the difference described in execution mode two are, fiber laser 1 as pumping source adopts 1mm pulse optical fiber, similar in the parameters such as repetition rate, pulse duration, beam quality and execution mode one.Front coupled lens 2 in pumping coupling system 10, the two-sided anti-reflection film being all coated with 1mm of rear coupled lens 3.OPO total reflective mirror 9 pairs of 1mm laser have high-transmission rate, near infrared signal light and in infrared ideler frequency light there is high reflectance, angled placement.In OPO shortwave, infrared outgoing mirror 5 pairs of near infrared signal light have fractional transmission rate, the infrared ideler frequency light of centering have high reflectance=.In OPO long wave, infrared outgoing mirror 7 pairs of 1mm laser have high-transmission rate, have high reflectance near infrared signal light, the infrared ideler frequency light of centering have fractional transmission rate-.By relative position and the angle of infrared outgoing mirror 5, OPO total reflective mirror 9 in adjustment OPO shortwave, realize the high-efficiency operation of three chamber mirror annular chamber OPO.The mid-infrared light of the optical parameter conversion generation that infrared outgoing mirror 7 in OPO long wave exports is comprised in the laser that annular chamber OPO4 exports, and the near infrared light that in OPO shortwave, infrared outgoing mirror 5 exports.
Embodiment four:
Composition graphs 1 illustrates present embodiment, the 2mm laser that present embodiment and execution mode one, difference described in execution mode two are as pumping source adopts the Tm of technology maturation, the solid state laser of Ho doping, enters pumping coupling system 10 by the Transmission Fibers of 2mm.
Embodiment five:
Composition graphs 1 illustrates present embodiment, present embodiment and the difference described in execution mode four be as pumping source ~ 2mm laser adopts KTP-OPO solid state laser, enters pumping coupling system 10 by the Transmission Fibers of 2mm.
Embodiment six:
Composition graphs 1 illustrates present embodiment, present embodiment and the difference described in execution mode three are the solid state laser (as Nd:YAG, Nd:YVO4, Nd:YLF etc.) into the 1mm laser of pumping source adopts the Nd of technology maturation to adulterate, and enter pumping coupling system 10 by the Transmission Fibers of 1mm.
Embodiment seven:
Composition graphs 1 illustrates present embodiment, and present embodiment and the difference described in execution mode six are the solid state laser into the 1.319mm laser of pumping source adopts the Nd of technology maturation to adulterate, and enter pumping coupling system 10 by the Transmission Fibers of 1.319mm.Front coupled lens 2 in pumping coupling system 10, the two-sided anti-reflection film being all coated with 1.319mm of rear coupled lens 3.OPO total reflective mirror 9 pairs of 1.319mm laser have high-transmission rate, near infrared signal light and in infrared ideler frequency light there is high reflectance, angled placement.In OPO long wave, infrared outgoing mirror 7 pairs of 1.319mm laser have high-transmission rate, have high reflectance near infrared signal light, and the infrared ideler frequency light of centering has fractional transmission rate.
Embodiment eight:
Composition graphs 1 illustrates present embodiment, present embodiment and the difference described in execution mode seven are to enter pumping coupling system 10 by the Transmission Fibers of 1.9mm by the solid state laser (as Tm:YAP, Tm:YLF etc.) that the Tm adopted into the 1.9mm laser of pumping source adulterates.Front coupled lens 2 in pumping coupling system 10, the two-sided anti-reflection film being all coated with 1.9mm of rear coupled lens 3.OPO total reflective mirror 9 pairs of 1.9mm laser have high-transmission rate, near infrared signal light and in infrared ideler frequency light there is high reflectance, angled placement.In OPO long wave, infrared outgoing mirror 7 pairs of 1.9mm laser have high-transmission rate, have high reflectance near infrared signal light, and the infrared ideler frequency light of centering has fractional transmission rate.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (7)
1. an infrared ring light parametric oscillator in compact three chamber mirrors, includes the fiber laser as OPO pumping source and OPO system shell, it is characterized in that: include pumping coupling system and OPO annular chamber in described OPO system shell; Front coupled lens and rear coupled lens is provided with in described pumping coupling system; Infrared outgoing mirror and nonlinear crystal in infrared outgoing mirror, OPO long wave is provided with in OPO speculum, OPO shortwave in described OPO annular chamber; The laser beam that described fiber laser sends enters OPO annular chamber through after front coupled lens and rear coupled lens successively; After described laser beam passes OPO speculum and nonlinear crystal after entering OPO annular chamber successively, infrared outgoing mirror in directive OPO long wave; LONG WAVE INFRARED light in described laser beam is through outgoing mirror injection OPO annular chamber infrared in OPO long wave, and the short-wave infrared light in laser beam reflexes in OPO shortwave through outgoing mirror infrared in OPO long wave and penetrates OPO annular chamber after infrared outgoing mirror.
2. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, is characterized in that: described front coupled lens and the ratio of rear coupled lens focal length are the fibre core size of laser beam and the ratio expecting waist spot size.
3. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, is characterized in that: the distance between described front coupled lens and fiber laser equals the focal length of front coupled lens.
4. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, is characterized in that: described front coupled lens and rear coupled lens are coaxially placed, and described nonlinear crystal is placed in the focal position of rear coupled lens.
5. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, is characterized in that: described fiber laser can output dual wavelength or multi-Wavelength Pulses laser.
6. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, it is characterized in that: in described OPO long wave, infrared outgoing mirror is plano-concave mirror, and to LONG WAVE INFRARED light, there is higher transmissivity, to the infrared light of other wavelength, there is higher reflectivity.
7. infrared ring light parametric oscillator in the compact three chamber mirrors of one according to claim 1, it is characterized in that: in described OPO shortwave, infrared outgoing mirror is plano-concave mirror, and to short-wave infrared light, there is higher transmissivity, to the infrared light of other wavelength, there is higher reflectivity.
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| CN201420781078.7U CN204290024U (en) | 2014-12-12 | 2014-12-12 | Infrared ring light parametric oscillator in a kind of compact three chamber mirrors |
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| CN201420781078.7U CN204290024U (en) | 2014-12-12 | 2014-12-12 | Infrared ring light parametric oscillator in a kind of compact three chamber mirrors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119137A (en) * | 2015-08-24 | 2015-12-02 | 哈尔滨工业大学 | High power far infrared 8 mu m laser beam generator based on ZnGeP2 circular cavity OPO |
| CN108292821A (en) * | 2015-09-11 | 2018-07-17 | 赫尔辛基大学 | The method and apparatus for generating frequency comb using optical manipulation device |
-
2014
- 2014-12-12 CN CN201420781078.7U patent/CN204290024U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119137A (en) * | 2015-08-24 | 2015-12-02 | 哈尔滨工业大学 | High power far infrared 8 mu m laser beam generator based on ZnGeP2 circular cavity OPO |
| CN108292821A (en) * | 2015-09-11 | 2018-07-17 | 赫尔辛基大学 | The method and apparatus for generating frequency comb using optical manipulation device |
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Effective date of registration: 20170525 Address after: 100192, A207, building two, building B-2, Zhongguancun Dongsheng science and Technology Park, No. 66 Xiao Dong Road, Beijing, Haidian District Patentee after: Beijing Huayu Dexin Photoelectric Technology Co Ltd Address before: 621000 Mianyang, Sichuan, box 1013, box of 919 Patentee before: Applied Electronics Inst., Chinese Engineering Physics Inst. |
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