CN105655863A - Single-frequency mid-infrared laser light source - Google Patents
Single-frequency mid-infrared laser light source Download PDFInfo
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- CN105655863A CN105655863A CN201610174997.1A CN201610174997A CN105655863A CN 105655863 A CN105655863 A CN 105655863A CN 201610174997 A CN201610174997 A CN 201610174997A CN 105655863 A CN105655863 A CN 105655863A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1312—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- Automation & Control Theory (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a single-frequency mid-infrared laser light source. The single-frequency mid-infrared laser light source comprises a 1,064-nm module, 1,550-nm module, an optical parameter conversion module and a detection feedback module, 1,064-nm pump light output by the 1,064-nm module and 1,550-nm signal light output by the 1,550-nm module are subjected to difference frequency processing through the optical parameter conversion module, 3.4-micrometer mid-infrared laser is output, the detection feedback module receives an optical parameter conversion module output signal, 638-nm red light resolved from the 3.4-micrometer mid-infrared laser serves as a detection signal, the rest 3.4-micrometer mid-infrared laser is filtered and output, the detection feedback module takes a 638-nm red light power change value as a feedback signal which returns to pump sources in the 1,064-nm module and the 1,550-nm module, the output power of the 1,064-nm module and the output power of the 1,550-nm module are adjusted, and it is guaranteed that the 3.4-micrometer mid-infrared laser output by the detection feedback module is stable. Stable mid-infrared single-frequency laser output can be achieved; light source adjustment is quick in response; mid-infrared output with adjustable broadband is achieved.
Description
Technical field
The present invention relates to a kind of laser technology, in particular to the single-frequency mid-infrared laser light source of a kind of stable output.
Background technology
Mid-infrared laser transmitance height in an atmosphere, loss is little, it is possible to apply to the satellite communication between star ground. Due to long transmission distance, the specification of quality of light beam of light source is very high. And current optics parameter device is solid state laser device system or space optical path coupled system, still there is bigger distance with practical.
Summary of the invention
The present invention be directed to mid-infrared laser use require high cannot the problem of practice, propose single-frequency mid-infrared laser light source, it is a kind of single-frequency mid-infrared laser light source with output rating detection and feedback control ability, mid-infrared laser can be exported by continous-stable for a long time.
The technical scheme of the present invention is: a kind of single-frequency mid-infrared laser light source, comprise 1064nm module, 1550nm module, optical parameter conversion module and detection feedback module, the 1064nm pump light that 1064nm module exports and the 1550nm flashlight that 1550nm module exports, after entering optical parameter conversion module difference process frequently, export 3.4 ��m of mid-infrared lasers, detection feedback module receives optical parameter conversion module output signal, and using the 638nm ruddiness therefrom decomposited as detecting signal, all the other 3.4 ��m of mid-infrared lasers filter and export, detection feeds back module using the power change values of 638nm ruddiness as feedback signal, feedback signal returns the pumping source in 1064nm module and 1550nm module, adjustment 1064nm module and 1550nm module output rating, ensure that 3.4 ��m of mid-infrared lasers that detection feedback module exports are stablized.
Described 1064nm module comprises: single mode narrow linewidth 1064nm light source, beam splitter, pumping source, wavelength division multiplexer, mix ytterbium gain optical fiber, shield retaining, two high power pump sources and bundling device, single mode narrow linewidth 1064nm light source export 1064nm seed light first through beam splitter by seed light 4:6 beam splitting, the light that power is big enter pump that wavelength division multiplexer and pumping source produce photosynthetic and after mix ytterbium gain fiber amplifier through first again, 1064nm light is obtained again by shield retaining, also photosynthetic through the pump of bundling device and two high power pump source generations, after merging, light enters light parameter transform module after mixing ytterbium gain fiber amplifier by the 2nd.
Described 1550nm module comprises: single mode narrow linewidth 1550nm light source, beam splitter, pumping source, wavelength division multiplexer, er-doped gain optical fiber, shield retaining, two high power pump sources and bundling device, single mode narrow linewidth 1550nm light source export 1550nm seed light first through beam splitter by seed light 4:6 beam splitting, the light that power is big enter pump that wavelength division multiplexer and pumping source produce photosynthetic and after mix ytterbium gain fiber amplifier through the 3rd again, 1550nm light is obtained again by shield retaining, also photosynthetic through the pump of bundling device and two high power pump source generations, after merging, light enters light parameter transform module after mixing ytterbium gain fiber amplifier by the 4th.
Described feedback signal returns the pumping source in 1064nm module and 1550nm module, is any one in the pumping source that is connected with beam splitter and two high power pump.
Described optical parameter conversion module comprises: superpower wavelength division multiplexer, PPLN heating module, the anti-mirror M4 of concave surface height, spectral filter and collimation mirror, wherein PPLN heating module comprises condensing lens and PPLN crystal, after the 1064nm pump light that 1064nm module exports and the 1550nm flashlight that 1550nm module exports are merged by superpower wavelength division multiplexer, after condensing lens and PPLN crystal heat, difference produces the mid-infrared light of 3.4 ��m frequently successively, also has 1064nm simultaneously, the frequency-doubled effect of 1550nm and 1064nm produces 532nm light, again by concave surface height anti-mirror M4 filtering 1064nm and 1550nm light.
The 532nm light of described optical parameter conversion module output and the mid-infrared light of 3.4 ��m, the first Gao Fanjing reflection in detection feedback module is isolated 638nm light and is detected, transmitted light filters mid-infrared laser further by spectral filter, high saturating 3 ��m of collimation mirrors successively, filter out 532nm light, 3.4 ��m of mid-infrared lasers of acquisition.
The 1064nm pump light that described 1064nm module exports and the 1550nm signal light power ratio that 1550nm module exports are 5:3.
The useful effect of the present invention is: single-frequency mid-infrared laser light source of the present invention, can obtain stable in infrared single-frequency laser export; Light source adjustment reflection is fast; Realize broadband adjustable in infrared output.
Accompanying drawing explanation
Fig. 1 is single-frequency mid-infrared laser light source schematic diagram of the present invention;
Fig. 2 is single-frequency mid-infrared laser light-source structure schematic diagram of the present invention.
Embodiment
Single-frequency mid-infrared laser light source schematic diagram as shown in Figure 1, the single-frequency mid-infrared laser light source of a kind of stable output. comprise 1064nm module 100,1550nm module 200, optical parameter conversion module 300 and detection feedback module 400. the 1064nm pump light that 1064nm module 100 exports and the 1550nm flashlight that 1550nm module 200 exports, after entering optical parameter conversion module 300 difference process frequently, export 3.4 ��m of mid-infrared lasers, detection feedback module receives optical parameter conversion module 300 and outputs signal, decompose the 638nm ruddiness exported as detection signal, all the other 3.4 ��m of mid-infrared lasers filter and export, detection feeds back module using the power change values of 638nm ruddiness as feedback signal, feedback signal returns the pumping source in 1064nm module and 1550nm module, adjustment 1064nm module and 1550nm module output rating, ensure that 3.4 ��m of mid-infrared lasers that detection feedback module exports are stablized.
1064nm pump light and 1550nm flashlight are while difference produces 3.4 ��m of mid-infrared lasers frequently, and the frequency-doubled effect that also can produce 1064nm produces the green glow of 532nm, and in 532nm and 3.4 ��m, Infrared Difference frequency effect produces the ruddiness of 638nm.
This cascaded nonlinear optical process is as follows:
��=c/ �� (c is the light velocity, �� wavelength, and �� is the repetition rate of respective wavelength)
��3.4��m=��1064nm-��1550nm
��532nm=2����1064nm
��638nm=��532nm-��3.4��m
��638nm=2����1064nm-��1064nm+��1550nm
: ��1064nm+��1550nm=��638nm
��1064nm-��1550nm=��3.4��m
It will be seen that 1064nm and the 1550nm equation of light obtains 3.4 ��m of mid-infrared lasers frequently, 638nm light also can reflect the stability of 1064nm and 1550nm light, i.e. the stability of the stability reflection mid-infrared laser of 638nm light.
Owing to the power of direct Real-Time Monitoring mid-infrared laser is very difficult, the present invention is the stability of 638nm by producing in monitoring PPLN crystal and stability infrared in indirect monitoring. 638nm laser enter stablize light state time, the power setting detected by now photorectifier is initial value. When the fluctuation of power of 638nm, it is possible to compared with initial value by the size of the instantaneous value detected by photorectifier.
Single-frequency mid-infrared laser light-source structure schematic diagram as shown in Figure 2,1064nm module 100 comprises: inclined double clad protected by single mode narrow linewidth 1064nm light source 101, beam splitter 102, pumping source 103, wavelength division multiplexer 104, the PMYSF-Hi gain optical fiber 105(mixing ytterbium), shield retaining 106, high power pump source 107 and 108, bundling device 109, the PLMA-YDF gain optical fiber 110(that mixes ytterbium protect inclined double clad). 1550nm module 200 comprises: the gain optical fiber 205(of single mode narrow linewidth 1550nm light source 201, beam splitter 202, pumping source 203, wavelength division multiplexer 204, er-doped protects inclined double clad), shield retaining 206, high power pump source 207 and 208, bundling device 209, er-doped gain optical fiber 210(protect inclined double clad). Optical parameter conversion module 300 comprise: PM-HWDM superpower wavelength division multiplexer 301, PPLN heating module 302(comprise condensing lens 303 and PPLN crystal 304), saturating 3.4 ��m of concave surface height anti-mirror M4(height, high anti-1550nm, high anti-1064nm) 305. Detection feedback module 400 comprises: high anti-600nm lens 401, spectral filter 402, high saturating 3 ��m of collimation mirrors 403.
1064nm module: 1064nm seed light first through beam splitter 102 by seed light 4:6 beam splitting, one end little for wherein power is used for detection, one end big for wherein power is connected to wavelength division multiplexer 104, the pump in wavelength division multiplexer 104, seed light and pumping source 103 produced photosynthetic and after again PMYSF-Hi gain optical fiber 105 through mixing ytterbium amplify, at the 1064nm light by obtaining 300mW after shield retaining 106, the pump in bundling device 109, seed light and high power pump source 107 and 108 produced photosynthetic and after protect inclined double clad through mixing the PMYSF-YDF gain optical fiber 110(of ytterbium again) amplify, when PM-HWDM superpower wavelength division multiplexer 301, the power of 1064nm laser is 5W. 1550nm module: 1550nm seed light first first through beam splitter 202 by seed light 4:6 beam splitting, one end little for wherein power is used for detection, one end big for wherein power is connected to wavelength division multiplexer 204, the pump in wavelength division multiplexer 204, seed light and pumping source 103 produced photosynthetic and after amplify through er-doped gain optical fiber 205 again, at the 1550nm light by obtaining 130mW after shield retaining 205, the pump in bundling device 209, seed light and high power pump source 207 and 208 produced photosynthetic and after protect inclined double clad through er-doped gain optical fiber 210(again) amplify, when PM-HWDM superpower wavelength division multiplexer 301, the power of 1550nm laser is 3W. by photosynthetic for 1064nm and 1550nm also (power proportions of 1064nm and 1550nm is five to three) in PM-HWDM superpower wavelength division multiplexer 301, again through PPLN heating module 302(PPLN crystalline temp Heating Furnace Control at 75 DEG C) difference frequently produces the mid-infrared light of 3.4 ��m after heating, also has 1064nm simultaneously, the frequency-doubled effect of 1550nm and 1064nm produces 532nm light, again by the anti-mirror M4305 of concave surface height, filtering 1064nm and 1550nm light, the mid-infrared light of 532nm light and 3.4 ��m enters detection feedback module 400, first isolate 638nm light through the reflection of too high anti-mirror 401 to detect, transmitted light is successively by spectral filter 402, high saturating 3 ��m of collimation mirrors 403 obtain pure mid-infrared laser further, filter out 532nm light, the power of the 3.4 ��m of mid-infrared lasers finally obtained is 5mW. 638nm laser enter stablize light state time, the power setting that detects of photorectifier in now detection feedback module 400 is initial value. when the fluctuation of power of 638nm, can be compared with initial value by the size of the instantaneous value detected by photorectifier, as when instantaneous value is greater than initial value: detection feedback module 400 sends negative-feedback signal to the pumping source 103 in 1064nm module 100, with high power pump 107 or 108, reduce power, send negative-feedback signal to the pumping source 203 in 1550nm module 200 simultaneously, and high power pump 207 or 208, reduce power, value when making the power of 638nm and 3.4 ��m of light return to stable. as instantaneous value be less than initial value time: detection feedback module 400 sends negative-feedback signal to the pumping source 103 in 1064nm module 100, and high power pump 107 or 108, increases power, send negative-feedback signal to the pumping source 202 in 1550nm module 200 simultaneously, and high power pump 207 or 208, increase power. value when making the power of 638nm and 3.4 ��m of light return to stable.
The 1064nm pump light of the present invention and 1550nm flashlight derive from two single frequency optical fiber lasers 101,201 respectively, and live width is all less than 10kHz. Can adopting the tunable light source of 1064nm and 1550nm, namely 1064nm single frequency optical fiber laser may be selected to be the single-frequency light in 1020nm to 1100nm scope, or 1550nm single frequency optical fiber laser may be selected to be the single-frequency light in 1530nm to 1580nm scope. The optical fiber link of the present invention all adopts polarization maintaining optical fibre and the optics of polarization maintaining optical fibre coupling, can guarantee that the pump light needed for optical parameter process and flashlight are line polarized lights. The cycle lithium niobate crystals (PPLN crystal) that the present invention adopts optical fiber to be coupled is middle produces non-linear process. In the process that single-frequency mid-infrared laser produces, the visible ray of the 638nm relevant to middle infrared signal power can be produced by cascade optical parameter process. By monitoring the Feedback of Power control mid-infrared laser of this 638nm visible ray, it is achieved the stable output of mid-infrared laser.
In the collection of infrared power and detection comparatively difficulty, in highly sensitive, infrared eye needs active refrigeration usually, and it is a lot of that water-cooled or liquid nitrogen cooling all can make laser apparatus volume increase. The present invention by by infrared power be associated to visible waveband, by monitoring the power of visible waveband, the indirectly stable output of infrared power in control, can obtain stable in the output of infrared single-frequency laser. By monitoring the strength fluctuation of 638nm visible ray, by comparing acquisition feedback signal with benchmark value, feedback signal being connected to the pumping source of laser amplifier, effectively the output rating of laser apparatus is locked to benchmark value, system is soon corresponding; The monitoring of visible ray is simple, effectively in the mid-infrared laser system integration; The tunable laser of 1064nm or 1550nm that broadband can be adopted adjustable, it is achieved infrared output during broadband is adjustable.
Claims (7)
1. a single-frequency mid-infrared laser light source, it is characterized in that, comprise 1064nm module, 1550nm module, optical parameter conversion module and detection feedback module, the 1064nm pump light that 1064nm module exports and the 1550nm flashlight that 1550nm module exports, after entering optical parameter conversion module difference process frequently, export 3.4 ��m of mid-infrared lasers, detection feedback module receives optical parameter conversion module output signal, and using the 638nm ruddiness therefrom decomposited as detecting signal, all the other 3.4 ��m of mid-infrared lasers filter and export, detection feeds back module using the power change values of 638nm ruddiness as feedback signal, feedback signal returns the pumping source in 1064nm module and 1550nm module, adjustment 1064nm module and 1550nm module output rating, ensure that 3.4 ��m of mid-infrared lasers that detection feedback module exports are stablized.
2. single-frequency mid-infrared laser light source according to claim 1, it is characterized in that, described 1064nm module comprises: single mode narrow linewidth 1064nm light source, beam splitter, pumping source, wavelength division multiplexer, mix ytterbium gain optical fiber, shield retaining, two high power pump sources and bundling device, single mode narrow linewidth 1064nm light source export 1064nm seed light first through beam splitter by seed light 4:6 beam splitting, the light that power is big enter pump that wavelength division multiplexer and pumping source produce photosynthetic and after mix ytterbium gain fiber amplifier through first again, 1064nm light is obtained again by shield retaining, also photosynthetic through the pump of bundling device and two high power pump source generations, after merging, light enters light parameter transform module after mixing ytterbium gain fiber amplifier by the 2nd.
3. single-frequency mid-infrared laser light source according to claim 1, it is characterized in that, described 1550nm module comprises: single mode narrow linewidth 1550nm light source, beam splitter, pumping source, wavelength division multiplexer, er-doped gain optical fiber, shield retaining, two high power pump sources and bundling device, single mode narrow linewidth 1550nm light source export 1550nm seed light first through beam splitter by seed light 4:6 beam splitting, the light that power is big enter pump that wavelength division multiplexer and pumping source produce photosynthetic and after mix ytterbium gain fiber amplifier through the 3rd again, 1550nm light is obtained again by shield retaining, also photosynthetic through the pump of bundling device and two high power pump source generations, after merging, light enters light parameter transform module after mixing ytterbium gain fiber amplifier by the 4th.
4. single-frequency mid-infrared laser light source according to Claims 2 or 3, it is characterised in that, described feedback signal returns the pumping source in 1064nm module and 1550nm module, is any one in the pumping source that is connected with beam splitter and two high power pump.
5. single-frequency mid-infrared laser light source according to claim 1, it is characterized in that, described optical parameter conversion module comprises: superpower wavelength division multiplexer, PPLN heating module, the anti-mirror M4 of concave surface height, spectral filter and collimation mirror, wherein PPLN heating module comprises condensing lens and PPLN crystal, after the 1064nm pump light that 1064nm module exports and the 1550nm flashlight that 1550nm module exports are merged by superpower wavelength division multiplexer, after condensing lens and PPLN crystal heat, difference produces the mid-infrared light of 3.4 ��m frequently successively, also has 1064nm simultaneously, the frequency-doubled effect of 1550nm and 1064nm produces 532nm light, again by concave surface height anti-mirror M4 filtering 1064nm and 1550nm light.
6. single-frequency mid-infrared laser light source according to claim 4, it is characterized in that, the 532nm light of described optical parameter conversion module output and the mid-infrared light of 3.4 ��m, the first Gao Fanjing reflection in detection feedback module is isolated 638nm light and is detected, transmitted light filters mid-infrared laser further by spectral filter, high saturating 3 ��m of collimation mirrors successively, filter out 532nm light, 3.4 ��m of mid-infrared lasers of acquisition.
7. single-frequency mid-infrared laser light source according to claim 1,2,3,5,6 any one, it is characterised in that, the 1064nm pump light that described 1064nm module exports and the 1550nm signal light power ratio that 1550nm module exports are 5:3.
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| CN201610174997.1A CN105655863B (en) | 2016-03-25 | 2016-03-25 | Single-frequency mid-infrared laser light source |
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| CN201610174997.1A CN105655863B (en) | 2016-03-25 | 2016-03-25 | Single-frequency mid-infrared laser light source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217095A (en) * | 2018-11-13 | 2019-01-15 | 徐州诺派激光技术有限公司 | Middle infrared pulsed lasers and its working method |
Citations (3)
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|---|---|---|---|---|
| US7079557B1 (en) * | 2003-10-02 | 2006-07-18 | Phtonics Industries Int'l | Intracavity OPO laser |
| US8218588B1 (en) * | 2010-02-16 | 2012-07-10 | Exelis, Inc. | Compact efficient seeded MID-IR OPO OPA laser |
| CN204621354U (en) * | 2012-07-18 | 2015-09-09 | 古河电气工业株式会社 | Fiber laser unit |
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2016
- 2016-03-25 CN CN201610174997.1A patent/CN105655863B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7079557B1 (en) * | 2003-10-02 | 2006-07-18 | Phtonics Industries Int'l | Intracavity OPO laser |
| US8218588B1 (en) * | 2010-02-16 | 2012-07-10 | Exelis, Inc. | Compact efficient seeded MID-IR OPO OPA laser |
| CN204621354U (en) * | 2012-07-18 | 2015-09-09 | 古河电气工业株式会社 | Fiber laser unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217095A (en) * | 2018-11-13 | 2019-01-15 | 徐州诺派激光技术有限公司 | Middle infrared pulsed lasers and its working method |
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