CN103715593A - Single-frequency intermediate infrared light source system of 2-micron fiber laser pump - Google Patents
Single-frequency intermediate infrared light source system of 2-micron fiber laser pump Download PDFInfo
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- CN103715593A CN103715593A CN201410009007.XA CN201410009007A CN103715593A CN 103715593 A CN103715593 A CN 103715593A CN 201410009007 A CN201410009007 A CN 201410009007A CN 103715593 A CN103715593 A CN 103715593A
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Abstract
The invention discloses a single-frequency intermediate infrared light source system of a 2-micron fiber laser pump. The single-frequency intermediate infrared light source system comprises a 2-micron fiber laser 1, a focusing lens 2, an incidence endoscope 3, a nonlinear crystal 4, an output endoscope 5, a total-reflection mirror 6, a total-reflection mirror 7 and a light filter 8. The 2-micron fiber laser 1 is used for emitting OPO pump light, and the OPO pump light is focused inside the nonlinear crystal 4 through the focusing lens 2; the incidence endoscope 3, the output endoscope 5, the total-reflection mirror 6 and the total-reflection mirror 7 form an OPO signal light resonant cavity to provide positive feedback for OPO signal light; after the intensity of the 2-micron pump light exceeds an OPO threshold value, stable single-frequency intermediate infrared signal light oscillation happens in the OPO signal light resonant cavity; single-frequency intermediate infrared signal light is output through the output endoscope 5; and pure single-frequency intermediate infrared signal light is output after passing through the light filter 8; tuning of the output wavelength is realized by changing phase matching conditions of the nonlinear crystal 4. The single-frequency intermediate infrared light source system of the 2-micron fiber laser pump effectively improves the light conversion efficiency of an OPO light source, and is relatively simple in structure and capable of obtaining a single-frequency intermediate infrared light source and meeting the requirement for high-precision application.
Description
Technical field
The present invention relates to the laser in laser technology field, particularly the high efficiency single-frequency mid-infrared light of a kind of employing 2 μ m optical-fiber laser pumpings is learned parametric oscillator.
Background technology
The coherent source that wavelength is positioned at 3-5 μ m middle-infrared band has important application demand in fields such as spectrum, remote sensing.Owing to lacking the gain media that can directly launch this wave band of laser, the middle IR coherent light source of 3-5 mu m waveband depends on nonlinear optics frequency means always, is particularly that the mode of optical parametric oscillator (OPO) obtains.
The 1 μ m(1064nm that the many employings of the OPO of this wave band easily obtain traditionally) laser is as pumping source, yet the energy difference between 3-5 μ m mid-infrared light of 1 μ m pump photon and output is very large, causes overall light optical efficiency lower.In part during to adopt phosphorus germanium zinc (ZGP) be nonlinear crystal in infrared OPO, for meeting phase-matching condition, need to first by 1 μ m laser pumping, annex OPO and obtain 2 μ m light sources, use again infrared OPO in 2 μ m light source pumpings, the stability that annexs on the one hand OPO is difficult to guarantee, increase a nonlinear frequency transformation process and also reduced total conversion efficiency, for improving non-linear conversion efficiency, often adopt pulsed mode and line style short cavity (ChineseOpticsLetters on the other hand, 9 (6), 061403, 2011), cause the spectral line width of its output wider, be difficult to meet the needs of high-precision applications.
Summary of the invention
The problem existing in order to overcome prior art, the present invention proposes a kind of single-frequency mid-infrared light origin system of 2 μ m optical-fiber laser pumpings, utilize 2 μ m fiber lasers as pumping source, reduce pump photon and required in energy difference between infrared output photon, to improve the light light conversion efficiency of OPO; In conjunction with ring-like travelling-wave cavity design, guarantee the single-frequency operation of OPO simultaneously, play the effect that improves spectral line width, to meet the demand of high-precision applications.
The present invention is achieved by following technical solution.
The present invention proposes a kind of single-frequency mid-infrared light source service system of 2 μ m optical-fiber laser pumpings, this light-source system comprises: 2 μ m fiber lasers 1, condenser lens 2, incident chamber mirror 3, nonlinear crystal 4, output cavity mirror 5, total reflective mirror 6, total reflective mirror 7, filter 8, wherein, condenser lens 2 plating 2 μ m pump light anti-reflection film systems; Incident chamber mirror 3 is concave mirror, and plating pump light is anti-reflection, flashlight high reflectivity film stack; Nonlinear crystal 4 two ends plating pump light, flashlight and ideler frequency light anti-reflection film systems; Output cavity mirror 5 is concave mirror, plating pump light and ideler frequency light is anti-reflection, flashlight part reflectance coating system; Total reflective mirror 6 and total reflective mirror 7 plating flashlight high reflectivity film stacks; High anti-, the flashlight anti-reflection film system of filter 8 plating pump lights and ideler frequency light;
Described 2 μ m fiber laser 1 transmitting 2 μ m laser, as the pump light of OPO, focus on described nonlinear crystal 4 inside through described condenser lens 2; Described incident chamber mirror 3, output cavity mirror 5 and total reflective mirror 6, total reflective mirror 7 form the flashlight resonant cavity of OPO, for OPO flashlight provides positive feedback, guarantee flashlight single-frequency operation; Described 2 μ m pump light intensities surpass after OPO threshold value, in described OPO flashlight resonant cavity, set up and have infrared signal light generation in stable single-frequency; In described single-frequency, infrared signal light is through described output cavity mirror 5 outputs; After the described filter remaining pump light of 8 elimination and ideler frequency light, obtain infrared signal light output in pure single-frequency; By changing the phase-matching condition of nonlinear crystal 4, realize the tuning of output wavelength.
Between described total reflective mirror 6 and described total reflective mirror 7 plating flashlight high reflectivity film stacks, be also provided with etalon 9, adopt CaF
2substrate, thickness 0.5mm.2 μ m pump lights, with e light incident PPLT crystal, are realized the fine tuning of output wavelength by the angle of adjustment criteria tool 9.
Compared with prior art, the present invention has advantage and good effect are:
The invention provides a kind of tunable single-frequency mid-infrared light source of 2 μ m optical-fiber laser pumpings, by adopting the optical-fiber laser of wavelength 2 μ m as pumping source, compare with 1 traditional μ m pump mode, significantly reduce the energy difference between pump photon and required mid-infrared light, thereby can effectively improve the light light conversion efficiency of OPO light source.By annular traveling wave chamber, in conjunction with optical-fiber laser pumping source, can with relatively simple structure, realize the single-frequency operation of OPO, obtain single-frequency mid-infrared light source, meet the needs of high-precision applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of the tunable single-frequency mid-infrared light source of 2 μ m optical-fiber laser pumpings provided by the invention.
Drawing reference numeral is described as follows:
1:2 μ m fiber laser; 2: condenser lens;
3: incident chamber mirror; 4: nonlinear crystal;
5: output cavity mirror; 6: total reflective mirror;
7: total reflective mirror; 8: filter;
9: etalon
Embodiment
For understanding summary of the invention of the present invention, Characteristic, below in conjunction with drawings and Examples, technology of the present invention is further described.
For solving current 3-5 μ m mid-infrared light, learn the problem that parametric oscillator light light conversion efficiency is lower, output spectrum live width is meticulous not, the embodiment of the present invention provides a kind of single-frequency mid-infrared light source system design scheme of 2 μ m optical-fiber laser pumpings, referring to Fig. 1.
2 μ m fiber lasers can be for mixing thulium (Tm) fiber laser, also can be for mixing near the fiber lasers of other emission wavelengths 2 μ m such as holmium (Ho) fiber laser, and during specific implementation, the embodiment of the present invention does not limit this.
Different according to required output wavelength, nonlinear crystal 4 can be period polarized lithium tantalate (PPLT) crystal, also can be the conventional middle infrared nonlinear optical crystal such as periodically poled lithium niobate (PPLN), phosphorus germanium zinc (ZGP) and phosphorus silicon cadmium (CSP), during specific implementation, the embodiment of the present invention does not limit this.
The tuning manner of output wavelength, can adopt to nonlinear crystal 4 carry out temperature adjusting, polarization cycle is tuning and the mode such as angle tuning, during specific implementation, the embodiment of the present invention does not limit this.
For improving the stability of single-frequency operation, realize the fine tuning of output wavelength simultaneously, the mid-infrared light source in the embodiment of the present invention, also comprises etalon 9, can realize the fine tuning of OPO wavelength by changing the angle of etalon 9.
With an experiment, verify the feasibility of the single-frequency mid-infrared light origin system of a kind of 2 μ m optical-fiber laser pumpings that the embodiment of the present invention provides below, wherein, 2 μ m fiber lasers 1 adopt mixes shake-amplification system of Tm optical fiber master, emission center wavelength 1950nm, maximum power output 50W; Nonlinear crystal 4 is PPLT crystal, size 30mm * 5mm * 1mm, polarization cycle 26.4-28.1 μ m, at 100 ℃ of working temperatures, respective signal light and ideler frequency optical wavelength range are respectively 3.21-3.9 μ m and 3.9-4.96 μ m, and each eyeglass and crystal end-face all plate the film system of respective wavelength scope;
In sum, the embodiment of the present invention provides a kind of tunable single-frequency mid-infrared light source of 2 μ m optical-fiber laser pumpings, the embodiment of the present invention by adopt 2 μ m fiber lasers substitute traditional 1 μ m laser as in the pumping source of infrared OPO, significantly reduce pump photon and the energy difference of exporting mid-infrared light, the light light conversion efficiency of infrared OPO in can effectively improving; For output middle infrared wavelength 3300nm, adopting 1064nm laser pumping quantum efficiency is only 32.2%, and adopt 1950nm pumping quantum efficiency, is 59.1%, and under identical parameter, under conversion efficiency, light light conversion efficiency can promote nearly one times; Relative 1 μ m laser pumping degeneracy OPO is the technical scheme of infrared OPO in pumping again, reduce by a nonlinear frequency transformation process, improved efficiency, complexity is significantly simplified simultaneously, the stable single-frequency operation that is more conducive to infrared OPO in realizing, meets the actual needs of high-precision applications.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the single-frequency mid-infrared light origin system of μ m optical-fiber laser pumping, it is characterized in that, this light-source system comprises 2 μ m fiber lasers (1), condenser lens (2), incident chamber mirror (3), nonlinear crystal (4), output cavity mirror (5), total reflective mirror (6), total reflective mirror (7) and filter (8); Wherein, condenser lens (2) plating 2 μ m pump light anti-reflection film systems; Incident chamber mirror (3) is concave mirror, and plating pump light is anti-reflection, flashlight high reflectivity film stack; The plating of nonlinear crystal (4) two ends pump light, flashlight and ideler frequency light anti-reflection film system; Output cavity mirror (5) is concave mirror, plating pump light and ideler frequency light is anti-reflection, flashlight part reflectance coating system; Total reflective mirror (6) and total reflective mirror (7) plating flashlight high reflectivity film stack; High anti-, the flashlight anti-reflection film system of filter (8) plating pump light and ideler frequency light;
Described 2 μ m fiber laser (1) transmitting 2 μ m laser, as the pump light of OPO, focus on described nonlinear crystal (4) inside through described condenser lens (2); Described incident chamber mirror (3), output cavity mirror (5) and total reflective mirror (6), total reflective mirror (7) form the flashlight resonant cavity of OPO, for OPO flashlight provides positive feedback, guarantee flashlight single-frequency operation; Described 2 μ m pump light intensities surpass after OPO threshold value, in described OPO flashlight resonant cavity, set up and have infrared signal light generation in stable single-frequency; In described single-frequency, infrared signal light is through described output cavity mirror (5) output; After the remaining pump light of described filter (8) elimination and ideler frequency light, obtain infrared signal light output in pure single-frequency; By changing the phase-matching condition of nonlinear crystal (4), realize the tuning of output wavelength.
2. the single-frequency mid-infrared light origin system of 2 μ m optical-fiber laser pumpings according to claim 1, is characterized in that, between described total reflective mirror (6) and described total reflective mirror 7 plating flashlight high reflectivity film stacks, is also provided with etalon (9), adopts CaF
2substrate, thickness 0.5mm; 2 μ m pump lights, with e light incident PPLT crystal, are realized the fine tuning of output wavelength by the angle of adjustment criteria tool 9.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816807A (en) * | 2017-03-30 | 2017-06-09 | 华中科技大学 | Optical fiber laser as pumping source intracavity pump optical parametric oscillator |
| CN108258575A (en) * | 2017-12-30 | 2018-07-06 | 湖北航天技术研究院总体设计所 | A kind of LONG WAVE INFRARED optical parametric oscillator of high conversion efficiency |
| CN108562551A (en) * | 2018-04-11 | 2018-09-21 | 黑龙江工程学院 | A kind of method that detector accurately measures concentration of SO 2 gas |
| CN108760653A (en) * | 2018-04-11 | 2018-11-06 | 黑龙江工程学院 | A kind of method that spectrometer accurately measures concentration of SO 2 gas |
| CN112054379A (en) * | 2020-10-12 | 2020-12-08 | 山西大学 | Angle determination, program control bias and locking method and system for inner cavity etalon |
| CN114361923A (en) * | 2021-12-29 | 2022-04-15 | 北京工业大学 | Mid-infrared parametric oscillator based on all-fiber laser pumping |
| CN116093730A (en) * | 2023-04-10 | 2023-05-09 | 北京工业大学 | Mid-infrared parametric oscillator for 2-micron all-fiber laser pumping |
| CN116191189A (en) * | 2023-04-19 | 2023-05-30 | 山西大学 | Single-frequency continuous optical parametric oscillator |
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| US20070035810A1 (en) * | 2005-07-08 | 2007-02-15 | Henderson Angus J | Apparatus and method for pumping and operating optical parametric oscillators using DFB fiber lasers |
| CN102570268A (en) * | 2011-12-29 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Intermediate infrared laser |
| CN203690698U (en) * | 2014-01-06 | 2014-07-02 | 天津大学 | Single-frequency intermediate infrared light source system of 2 [mu]m fiber laser pump |
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2014
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Patent Citations (3)
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| US20070035810A1 (en) * | 2005-07-08 | 2007-02-15 | Henderson Angus J | Apparatus and method for pumping and operating optical parametric oscillators using DFB fiber lasers |
| CN102570268A (en) * | 2011-12-29 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Intermediate infrared laser |
| CN203690698U (en) * | 2014-01-06 | 2014-07-02 | 天津大学 | Single-frequency intermediate infrared light source system of 2 [mu]m fiber laser pump |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816807A (en) * | 2017-03-30 | 2017-06-09 | 华中科技大学 | Optical fiber laser as pumping source intracavity pump optical parametric oscillator |
| CN106816807B (en) * | 2017-03-30 | 2020-02-14 | 华中科技大学 | Intracavity pump optical parametric oscillator using optical fiber laser as pump source |
| CN108258575A (en) * | 2017-12-30 | 2018-07-06 | 湖北航天技术研究院总体设计所 | A kind of LONG WAVE INFRARED optical parametric oscillator of high conversion efficiency |
| CN108258575B (en) * | 2017-12-30 | 2020-05-19 | 湖北航天技术研究院总体设计所 | Long-wave infrared optical parametric oscillator with high conversion efficiency |
| CN108562551A (en) * | 2018-04-11 | 2018-09-21 | 黑龙江工程学院 | A kind of method that detector accurately measures concentration of SO 2 gas |
| CN108760653A (en) * | 2018-04-11 | 2018-11-06 | 黑龙江工程学院 | A kind of method that spectrometer accurately measures concentration of SO 2 gas |
| CN112054379A (en) * | 2020-10-12 | 2020-12-08 | 山西大学 | Angle determination, program control bias and locking method and system for inner cavity etalon |
| CN114361923A (en) * | 2021-12-29 | 2022-04-15 | 北京工业大学 | Mid-infrared parametric oscillator based on all-fiber laser pumping |
| CN116093730A (en) * | 2023-04-10 | 2023-05-09 | 北京工业大学 | Mid-infrared parametric oscillator for 2-micron all-fiber laser pumping |
| CN116191189A (en) * | 2023-04-19 | 2023-05-30 | 山西大学 | Single-frequency continuous optical parametric oscillator |
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Application publication date: 20140409 |