CN103944049A - Miniature three-endoscope ring cavity mid-infrared optical parametric oscillator - Google Patents
Miniature three-endoscope ring cavity mid-infrared optical parametric oscillator Download PDFInfo
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- CN103944049A CN103944049A CN201410114460.7A CN201410114460A CN103944049A CN 103944049 A CN103944049 A CN 103944049A CN 201410114460 A CN201410114460 A CN 201410114460A CN 103944049 A CN103944049 A CN 103944049A
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Abstract
The invention provides a miniature three-endoscope ring cavity mid-infrared optical parametric oscillator. According to the technical scheme, the three- endoscope ring cavity structure is adopted, the inverse transformation effect is reduced, transformation efficiency is improved, system isolation is avoided, and the size of an OPO system is reduced. Compared with a four-endoscope ring cavity OPO, the three-endoscope ring cavity OPO reduces the light outlet threshold of a laser device, transformation efficiency is improved, the complexity of a ring cavity is reduced, reliability of the OPO system is improved, and the size and the weight of the OPO system are reduced at the same time.
Description
Technical field
What the present invention relates to is laser technique, especially a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator.
Background technology
In the prior art, known technology is that the mid-infrared laser of 3-5 μ m 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 of application and deeply, having infrared solid laser in certain power level, tunable, miniaturization receives much concern in recent years.Optical parametric oscillator (OPO) based on frequency translation is one of effective way producing high power, tunable mid-infrared laser.
OPO system is mainly made up of pump laser, coupling shielding system, nonlinear crystal resonant cavity mirror.And OPO is only made up of nonlinear crystal and chamber mirror, it is simple in structure, compact, is very beneficial for developing to miniaturization.But its pump laser is relative complex and huge but, be difficult to and OPO integration realization integral miniaturization.Along with the development of 1 μ m and 2 μ m Fiber laser technologies, in the miniaturization of infrared OPO another kind of thinking is provided, be about to separate with OPO as the fiber laser of pumping source integrated, thereby realize the miniaturization of OPO.
In line chamber OPO, in order to reduce the conversion efficiency of threshold value, raising pump light, outgoing mirror, conventionally to pumping laser reflection, comes and goes pumping laser and passes through nonlinear crystal.But in order to prevent the impact of light echo on pump laser, must between pump laser and OPO, add shielding system.This will increase the weight and volume of OPO, and the complexity of system.Especially, in the time that OPO is near degeneracy wavelength, will there is serious inverse conversion effect in line chamber OPO, reduces the conversion efficiency of pump light.
In order to reduce inverse conversion effect, avoid the impact of light echo on pumping laser, proposed to adopt the mentality of designing of annular chamber in miniaturization OPO.And the proposition of miniaturization OPO to volume, weight and reliability aspect strict demand, four common chamber mirror annular chambers (rectangle or X-type) are also not exclusively suitable for, and need be optimized design for miniaturization specially, this is the existing weak point of prior art.
Summary of the invention
Object of the present invention, be exactly for the existing deficiency of prior art, and provide a kind of technical scheme of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator, this scheme can realize OPO miniaturization, the photo threshold that goes out that has reduced laser, has improved conversion efficiency, has reduced the complexity of annular chamber, improve the reliability of OPO system, reduced the volume and weight of OPO system simultaneously.
This programme is achieved by the following technical measures: a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator, include fiber laser and OPO system shell as OPO pumping source, in OPO system shell, include pumping coupling system and OPO annular chamber; In pumping coupling system, be provided with front coupled lens and rear coupled lens; In OPO annular chamber, be provided with OPO speculum, OPO total reflective mirror, OPO outgoing mirror and nonlinear crystal; The laser beam that fiber laser sends is successively through entering OPO annular chamber after front coupled lens and rear coupled lens; Laser beam penetrates through after OPO total reflective mirror, nonlinear crystal and OPO outgoing mirror after entering OPO annular chamber successively; When laser beam passes OPO outgoing mirror, a part of laser beam is reflexed to OPO speculum by OPO outgoing mirror and after OPO speculum reflexes to OPO total reflective mirror, reflexes to nonlinear crystal through OPO total reflective mirror again.
As this programme preferably: the fibre core size that front coupled lens and the ratio of rear coupled lens focal length are laser beam and expect the ratio of waist spot size.
As this programme preferably: the distance between front coupled lens and fiber laser equals the focal length of front coupled lens.
As this programme preferably: front coupled lens and rear coupled lens are coaxially placed, and described nonlinear crystal is placed in the focal position of rear coupled lens.
As this programme preferably: by adjusting distance energy coarse adjustment laser between front coupled lens and fiber-optic output by waist spot position and size after pumping coupling system; Can finely tune waist spot position and size by the relative distance of adjusting between front coupled lens and rear coupled lens.
As this programme preferably: front coupled lens and rear coupled lens select the convex lens of two short focal lengths to combine.
This programme is according to parameters such as the numerical aperture of fiber laser and fibre core sizes, multiple different short focal length lens combinations are carried out to simulation calculation and optimization design, under the prerequisite that meets the condition of debuging, shorten as far as possible the distance of two eyeglass spacing and rear coupled lens and waist spot position, and obtain suitable waist spot size to optimize pump power density, in avoiding lens lesion, improve conversion efficiency.In specific implementation process, the ratio of selecting two lump coke distances is actual fibre core size and expect the short focal length lens of ratio of waist spot size, when distance between front coupled lens and fiber-optic output is its focal length size, change two lens relative distances less on the waist spot size and location impact by after coupled system, therefore by compact as far as possible two lens coaxial placement, nonlinear crystal is placed in rear coupled lens focal position, should be noted that the chamber mirror that rear coupled lens focal length is greater than an angled placement debugs Len req.When dwindling distance between front coupled lens and fiber-optic output while making it be less than front coupled lens focal length, by the waist spot position after coupled system from lens more away from, waist spot is larger; When distance between current coupled lens and fiber-optic output is greater than its focal length, by the waist spot position after coupled system from lens more close to, waist spot is less, by adjusting two lens relative distance fine-tuning waist spot positions and size.
The beneficial effect of this programme can be learnt according to the narration to such scheme, owing in this scheme, the fiber laser as pumping source being separated with OPO, realized the miniaturization of OPO, the OPO system after integrated vanning only includes coupled system and the OPO annular chamber of lens composition; Optimize pumping coupling system, adopt two short focus lens combinations, by optimizing focal length and the relative distance of two lens, the spot size of pumping laser, beam waist position, the angle of divergence etc. are realized to 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, three chamber mirror OPO annular chambers have reduced the photo threshold that of laser, have improved conversion efficiency, have reduced the complexity of annular chamber, have improved the reliability of OPO system, have reduced the volume and weight of OPO system simultaneously.
As can be seen here, the present invention compared with prior art, has outstanding substantive distinguishing features and progressive significantly, and the beneficial effect of its enforcement is also apparent.
Brief description of the drawings
Fig. 1 is the structural representation of the specific embodiment of the invention.
In figure, 1 is fiber laser, and 2 is front coupled lens, and 3 is rear coupled lens, and 4 is OPO speculum, and 5 is OPO annular chamber, and 6 is OPO system shell, and 7 is OPO outgoing mirror, and 8 is nonlinear crystal, and 9 is OPO total reflective mirror, and 10 is pumping coupling system.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
Miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator provided by the invention comprise: as the fiber laser 1 of pumping source, front coupled lens 2, rear coupled lens 3, OPO speculum 4, OPO total reflective mirror 9, OPO outgoing mirror 7, nonlinear crystal 8, pumping coupling system 10, annular chamber OPO5, 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 OPO5 is by OPO speculum 4, OPO total reflective mirror 9, and OPO outgoing mirror 7, nonlinear crystal 8 forms, OPO speculum 4, OPO total reflective mirror 9, the relative position of OPO outgoing mirror 7 and angle will be adjusted 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, and pulse duration hundred nanosecond adopt polarization maintaining optical fibre to realize linear polarization output, to reach the phase-matching condition of OPO.
Pumping coupling system 10 is realized the 2mm pulse laser of fiber laser output is collimated and expanded, front coupled lens 2, the two-sided anti-reflection film that is all coated with 2mm of rear coupled lens 3.
Nonlinear crystal 8 in annular chamber OPO5 adopts two ZGP crystal (ZnGeP2 that optical axis direction is staggered relatively, phosphorus germanium zinc), with walking 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 has high-transmission rate to 2mm laser, and near laser 4mm is had to high reflectance, angled placement.OPO speculum 4 has high reflectance near laser 4mm, becomes level angle to place.OPO outgoing mirror 7 has high-transmission rate to 2mm laser, and near laser 4mm is had to partial reflectance, angled placement.By adjusting OPO speculum 4, OPO total reflective mirror 9, the relative position of OPO outgoing mirror 7 and angle, realize the high-efficiency operation of three chamber mirror annular chamber OPO.By changing angle and the working temperature of ZGP crystal, can realize the tuning of 3 ~ 5mm wave band.In the laser of annular chamber OPO5 output, comprise near the laser of 4mm that optical parameter conversion produces, and remaining non-switched 2 pumping lasers.
After the system integration, the volume of OPO system shell 6 can be controlled in 80mm × 80mm × 220mm, and weight is less than 2.5kg, and two waveband power output reaches tens of watts.
Embodiment two:
In conjunction with Fig. 1, present embodiment is described, difference described in present embodiment and execution mode one is, nonlinear crystal adopts PPLN crystal (Periodically Poled Lithium Niobate, periodically poled lithium niobate), two logical light faces of crystal are coated with the anti-reflection film of pumping laser and parameter laser.Because PPLN crystal is based on accurate phase matched, there is not walk-off effect, therefore do not need bicrystal to walk from compensation.By polarization cycle (monocycle, multicycle, fan-shaped cycle, mixing cycle), incident angle and the working temperature (room temperature to 200 DEG C conventionally) etc. of design PPLN crystal, absorb in cut-off wave band meeting phase-matching condition and PPLN, can realize near the continuous precise of 1 ~ 4mm tuning, and be expected to realize the even mid-infrared laser output of super continuous spectrums of multiband (>=2).
Embodiment three:
In conjunction with Fig. 1, present embodiment is described, difference described in present embodiment and execution mode two is, 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 that is all coated with 1mm of rear coupled lens 3.OPO total reflective mirror 9 has high-transmission rate to 1mm laser, near infrared signal light and in infrared ideler frequency light there is high reflectance, angled placement.OPO speculum 4 near infrared signal light and in infrared ideler frequency light there is high reflectance, become level angle place.OPO outgoing mirror 7 has high-transmission rate to 1mm laser, near infrared signal light and in wherein a kind of laser of infrared ideler frequency light there is high-transmission rate, another kind of laser has part reflection, or two kinds of laser are all had to part reflection, angled placement.By adjusting OPO speculum 4, OPO total reflective mirror 9, the relative position of OPO outgoing mirror 7 and angle, realize the high-efficiency operation of three chamber mirror annular chamber OPO.
Embodiment four:
In conjunction with Fig. 1, present embodiment is described, difference described in present embodiment and execution mode one, execution mode two be as pumping source ~ 2mm laser 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:
In conjunction with Fig. 1, present embodiment is described, difference described in present embodiment and execution mode three is to adopt into the 1mm laser of pumping source the solid state laser (as Nd:YAG, Nd:YVO4, Nd:YLF etc.) of the Nd doping of technology maturation, enters pumping coupling system 10 by the Transmission Fibers of 1mm.
Embodiment five:
In conjunction with Fig. 1, present embodiment is described, the difference described in present embodiment and execution mode five is to adopt into the 1.319mm laser of pumping source the solid state laser of the Nd doping of technology maturation, enters 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 that is all coated with 1.319mm of rear coupled lens 3.OPO total reflective mirror 9 has high-transmission rate to 1.319mm laser, near infrared signal light and in infrared ideler frequency light there is high reflectance, angled placement.OPO speculum 4 near infrared signal light and in infrared ideler frequency light there is high reflectance, become level angle place.OPO outgoing mirror 7 has high-transmission rate to 1.319mm laser, near infrared signal light and in wherein a kind of laser of infrared ideler frequency light there is high-transmission rate, another kind of laser has part reflection, or two kinds of laser are all had to part reflection, angled placement.
Claims (5)
1. miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator, include fiber laser and OPO system shell as OPO pumping source, it is characterized in that: in described OPO system shell, include pumping coupling system and OPO annular chamber; In described pumping coupling system, be provided with front coupled lens and rear coupled lens; In described OPO annular chamber, be provided with OPO speculum, OPO total reflective mirror, OPO outgoing mirror and nonlinear crystal; The laser beam that described fiber laser sends is successively through entering OPO annular chamber after front coupled lens and rear coupled lens; Described laser beam penetrates through after OPO total reflective mirror, nonlinear crystal and OPO outgoing mirror after entering OPO annular chamber successively; When described laser beam passes OPO outgoing mirror, a part of laser beam is reflexed to OPO speculum by OPO outgoing mirror and after OPO speculum reflexes to OPO total reflective mirror, reflexes to nonlinear crystal through OPO total reflective mirror again.
2. a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator according to claim 1, is characterized in that: described front coupled lens and the ratio of rear coupled lens focal length the fibre core size that is laser beam and the ratio of expecting waist spot size.
3. a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator 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. a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator 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. a kind of miniaturization three chamber mirror annular chamber mid-infrared parameter oscillator according to claim 1, is characterized in that: pass through waist spot position and the size after pumping coupling system by the distance energy coarse adjustment laser of adjusting between front coupled lens and fiber-optic output; Can finely tune waist spot position and size by the relative distance of adjusting between front coupled lens and rear coupled lens.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107611762A (en) * | 2017-10-16 | 2018-01-19 | 中国科学院合肥物质科学研究院 | A kind of broad tuning, narrow linewidth, efficient mid-infrared parameter oscillator |
| CN109326950A (en) * | 2018-12-11 | 2019-02-12 | 中国科学院上海光学精密机械研究所 | Ring cavity structure optically erasing device |
| JP2020516961A (en) * | 2017-04-17 | 2020-06-11 | ユニバーシティ・オブ・セントラル・フロリダ・リサーチ・ファウンデーション，インコーポレイテッドＵｎｉｖｅｒｓｉｔｙ Ｏｆ Ｃｅｎｔｒａｌ Ｆｌｏｒｉｄａ Ｒｅｓｅａｒｃｈ Ｆｏｕｎｄａｔｉｏｎ， Ｉｎｃ． | Optical parametric device based on random phase matching in polycrystalline media |
| CN111417249A (en) * | 2019-01-07 | 2020-07-14 | 中国科学院大连化学物理研究所 | Method for preparing molecular beam by excitation of molecule broad-band vibration-inversion state |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP2020516961A (en) * | 2017-04-17 | 2020-06-11 | ユニバーシティ・オブ・セントラル・フロリダ・リサーチ・ファウンデーション，インコーポレイテッドＵｎｉｖｅｒｓｉｔｙ Ｏｆ Ｃｅｎｔｒａｌ Ｆｌｏｒｉｄａ Ｒｅｓｅａｒｃｈ Ｆｏｕｎｄａｔｉｏｎ， Ｉｎｃ． | Optical parametric device based on random phase matching in polycrystalline media |
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| CN107611762A (en) * | 2017-10-16 | 2018-01-19 | 中国科学院合肥物质科学研究院 | A kind of broad tuning, narrow linewidth, efficient mid-infrared parameter oscillator |
| CN109326950A (en) * | 2018-12-11 | 2019-02-12 | 中国科学院上海光学精密机械研究所 | Ring cavity structure optically erasing device |
| CN111417249A (en) * | 2019-01-07 | 2020-07-14 | 中国科学院大连化学物理研究所 | Method for preparing molecular beam by excitation of molecule broad-band vibration-inversion state |
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Effective date of registration: 20170522 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. |