CN201518383U - Mid-IR coherent optical source apparatus - Google Patents
Mid-IR coherent optical source apparatus Download PDFInfo
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- CN201518383U CN201518383U CN2009202057155U CN200920205715U CN201518383U CN 201518383 U CN201518383 U CN 201518383U CN 2009202057155 U CN2009202057155 U CN 2009202057155U CN 200920205715 U CN200920205715 U CN 200920205715U CN 201518383 U CN201518383 U CN 201518383U
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Abstract
The present utility model pertaining to a technical field of optical devices provides a mid-IR coherent optical source apparatus comprising a pump laser, a photics parameter resonance cavity and two multiple-period periodically poled crystals that are cascaded, the two crystals are positioned in the photics parameter resonance cavity and fixed in a temperature control furnace. Pump lights generated by the pump laser enter into the photics parameter resonance cavity having periodically poled crystals inside for frequency conversion, after oscillation amplifying, the lights are sent to generate mid-IR coherent lights, and the periodically poled crystals are periodically poled Mgo-doped lithium niobate (PPMgLN) crystals. According to the utility model, a quasi-phase-matching optically parametric oscillator can be realized by adopting two multiple-period PPMgLN crystals that are cascaded, a mid-IR coherent optical source with high output power and high conversion efficiency can be obtained in range of tuning wavelength of 3mum to 5mum through adjusting correlation parameters of temperature, period and the like of the PPMgLN crystals, satisfying the requirement of practical application well.
Description
Technical field
The utility model relates to field of optical device technology, more particularly, relate to a kind of tunable wave length in infrared coherent source device.
Background technology
Infrared light has three main transmission windows in atmosphere: 1～3 μ m, 3～5 μ m, 8～12 μ m, wherein 3～5 μ m are the minimum infrared windows of decay, this wave band of laser has stronger penetration power to dense fog, flue dust etc., thereby seeks the laser of 3～5 mum wavelength scopes of clear and definite application demand output on track guided missile and the infrared counteraction in heat; In addition, most important hydrocarbon gas and other toxic gas molecules have stronger absorption characteristic in this wave band, thereby, in infrared coherent source be widely used in the minimum gas field of detecting, as methane gas detection etc. in the detection of biochemistry station agent and the colliery.So in infrared coherent source detect at the detection of remote environment pollutant and trace gas, waste gas, aspect such as infrared track-while-scan target navigation and laser medicine diagnosis and treatment all has wide practical value in airborne land on a large scale and marine pollution detection, middle infrared spectrum, the military affairs.
In recent decades, optical parameter resonant cavity (OPO) is considered to export the perfect light source of broadband spectral scope coherent light always, and its performance parameter almost completely depends on the characteristic of spectral characteristic, beam quality and the nonlinear crystal of pump laser.Along with the maturation of accurate phase matched (QPM) technology, utilize the nonlinear optical frequency conversion technology of periodical poled crystal to cause concern widely.
Infrared accurate phase matched OPO light source in the present high impulse energy mainly is by utilizing the large aperture non-linear photon crystal to realize high-octane output.Yet, to discovering of infrared accurate phase matched OPO among continuous wavelength 3～5 μ m, the power output in mid-infrared light source, 3 μ m place reaches as high as about 1 watt, but along with the increase of wavelength, the absorption loss of mid-infrared laser in crystal of this light source output also increases, thereby its power output also reduces gradually, it goes out the highest 20 milliwatts that only reach of power at 5 μ m places, and its conversion efficiency is low, has only a few percent at most, can not well satisfy practical application request.
Summary of the invention
The technical problems to be solved in the utility model is, at infrared coherent source power output in the prior art and the lower defective of transformation efficiency, provide a kind of high power, broad tuning in infrared coherent source device.
The embodiment of the invention is to realize like this, infrared coherent source device in a kind of, it is characterized in that, described in infrared coherent source device comprise: pump laser, optical parameter resonant cavity and be arranged in described optical parameter resonant cavity and be fixed in two multiply periodic periodical poled crystals of cascade of temperature controlling stove; The pump light that is produced by described pump laser enters and carries out frequency inverted in the optical parameter resonant cavity that is built-in with described periodical poled crystal and vibration is amplified the back outgoing with infrared coherent light in producing; Described periodical poled crystal is period polarized magnesium oxide doped lithium niobate crystal.
Further, described pump laser is the Nd:YAG solid state laser of 1.064 μ m for output pumping optical wavelength.
Further, described optical parameter resonant cavity comprises input mirror M1 and outgoing mirror M2, and described input mirror M1 is the input coupling mirror, and the concave surface of described input mirror M1 is coated with 1.064 μ m anti-reflection films, 1.4～2 μ m high-reflecting films and 2.5～5 μ m anti-reflection films; Described outgoing mirror M2 is an output coupling mirror, and the concave surface of described outgoing mirror M2 is coated with 2.5～5 μ m anti-reflection films, 1.4～2 μ m high-reflecting films and 1.064 μ m anti-reflection films.
Further, described periodical poled crystal comprises the period polarized magnesium oxide doped lithium niobate crystal of two cascades, and its polarization cycle is between 26～31 μ m and with 0.5 μ m to be spaced apart.
Further, infrared coherent source device also comprises the high-accuracy five dimension adjustment racks of adjustment cycle polarization magnesium oxide doped lithium niobate crystal period position in described.
Further, the adjustable temperature range of described temperature controlling stove is 40～200 ℃.
Further, in described infrared coherent source device also comprise be successively set on being used between described pump laser and the optical parameter resonant cavity adjust pump light the polarization direction devating prism and to the girdle the waist lens of conversion of pump light; Described devating prism makes the z axle of the polarization direction of pump light and described periodical poled crystal parallel; Described lens make the parameter with a tight waist of pump light and the parameter matching with a tight waist of described optical parameter resonant cavity.
Further, infrared coherent source device also comprises and the filter plate of the plane output of being close to outgoing mirror M2 is coated with 2.5～5 μ m anti-reflection films and 1.064 μ m and 1.4～2 μ m high-reflecting films on the described filter plate in described.
The utility model adopts the PPMgLN crystal of two cascades to realize quasi-phase matched optical parametric oscillator, relevant parameters such as the temperature by adjusting the PPMgLN crystal, cycle, under tuning wavelength scope 3～5 μ m conditions, obtained high-output power and high conversion efficiency in infrared coherent source, satisfied practical application request better.
Description of drawings
The structural representation of infrared coherent source device in the preferred embodiment of Fig. 1 the utility model.
Embodiment
See also Fig. 1, the structural representation of infrared coherent source device in the preferred embodiment of Fig. 1 the utility model.
Infrared coherent source device comprises pump laser 1, devating prism 2, lens 3, optical parameter resonant cavity 4, periodical poled crystal 5 and filter plate 6 in of the present utility model.Wherein, adjust its polarization direction by the pump light that pump laser 1 produces through polarized lens 2, enter the optical parameter resonant cavity 4 that is built-in with periodical poled crystal 5 and carry out frequency inverted through lens 3 again, ideler frequency light at last via outgoing after filter plate 6 filtering with produce required in infrared coherent light; Periodical poled crystal 5 can for period polarized magnesium oxide doped lithium niobate crystal (Periodically poled Mgo-doped Lithium Niobate, PPMgLN).
Wherein, pump laser 1 is that (Laser Diode, LD), pump laser 1 is chosen the Nd:YAG solid state laser that output wavelength is 1.064 μ m to laser diode in the utility model preferred embodiment.Because the Nd:YAG crystal has bigger stimulated emission cross section, output light has polarization characteristic, and growing technology maturation, the wavelength of its output is that the light-light conversion efficiency of 1.064 μ m laser can be greater than 50%, the utility model makes full use of its high light beam quality and polarization characteristic, to realize high efficiency nonlinear optical frequency conversion.
Devating prism 2 is used to adjust the polarization direction of pump light, makes the z axle of its polarization direction and periodical poled crystal 5 parallel.
Lens 3 are used to adjust the waist radius of the pump light of incident, make the parameter matching with a tight waist of its parameter with a tight waist and optical parameter resonant cavity 4, to improve the conversion efficiency that mid-infrared laser produces.
Optical parameter resonant cavity 4 is to realize the vitals of single short wavelength's pump light to the long wave expansion, it comprises input mirror M1 and outgoing mirror M2, wherein input mirror M1 is input coupling mirror (plano-concave mirror), and its concave surface is coated with 1.064 μ m anti-reflection film HT (transmissivity T＞90%), 1.4～2 μ m high-reflecting film HR (reflectivity R＞99.8%) and 2.5～5 μ m anti-reflection film HT (transmissivity T＞10%); Outgoing mirror M2 is output coupling mirror (a plano-concave mirror), and its concave surface is coated with 2.5～5 μ m anti-reflection film HT (transmissivity T＞90%), 1.4～2 μ m high-reflecting film HR (reflectivity R＞99.8%) and 1.064 μ m anti-reflection film HT (transmissivity T＞10%).
In the utility model, period polarized PPMgLN has the higher non-linearity optical coefficient, sells off advantages such as threshold value than low coercive field, higher damage threshold and light, infrared OPO reduces greatly to the power requirement of pump laser in making, low coercive field is to allow thick crystal to be polarized into the accurate phase matched in large aperture (QPM) device, and infrared OPO light source moves towards practical application from the laboratory in the high power broad tuning thereby really make.PPMgLN has polarization cycle and sets between 26～31 μ m and with the interval of 0.5 μ m.Because the long periodical poled crystal of processing is difficult to, and choose the PPMgLN crystal of same two cascades in the present embodiment, and its polarization cycle is 28.5 μ m.Periodical poled crystal 5 is built in the optical parameter resonant cavity 4, and is fixed in the temperature control furnace, and the adjustable temperature range of this temperature control furnace is 40～200 ℃, can change the temperature of periodical poled crystal 5 by the temperature of controlling this temperature control furnace; In addition, also be provided with high-accuracy five dimension adjustment racks on the periodical poled crystal 5, polarization cycle position that can accurate adjustment cycle polarized crystal 5.
Be appreciated that the periodical poled crystal 5 in the utility model also can adopt an independent magnesium oxide doped lithium niobate crystal, but the long periodical poled crystal of processing at present is difficult to realize.
Filter plate 6 is close to the plane output of outgoing mirror M2, and it is coated with 2.5～5 μ m anti-reflection film HT (transmissivity T＞90%), 1.064 μ m and 1.4～2 μ m high-reflecting film HR (reflectivity R＞98%).
When infrared coherent source device is worked in of the present utility model, it by Nd:YAG solid pump laser 1 output wavelength earlier the laser beam (for the certain linear light in polarization direction) of 1.064 μ m, make the z axle of its polarization direction and periodical poled crystal 5 parallel through devating prism 2, then this laser beam makes the parameter matching with a tight waist of its parameter with a tight waist and optical parameter resonant cavity 4 through lens 3 conversion of girdling the waist, enter optical parameter resonant cavity 4 and inject periodical poled crystal 5 from input mirror M1 again, through frequency inverted is flashlight and ideler frequency light, flashlight reciprocating vibration in the chamber amplifies, and ideler frequency light once passes through the chamber at last from the outgoing mirror M2 of optical parameter resonant cavity 4 and via filter plate 6 outgoing.
By regulating temperature (40～200 ℃ of adjustable extents) and the polarization cycle thereof that temperature control furnace and high-accuracy five dimension adjustment racks change periodical poled crystal 5, can realize the mid-infrared laser output of continuously adjustable in the 2.789-4.957 mu m range.When pump laser 1 average output power is 8.15W, at wavelength is 3.344 μ m places, utilize two PPMgLN crystal cascade structures to produce the ideler frequency light output of average power for 2.23W, this time-light conversion efficiency reaches 27.4%, and obtained average power with a PPMgLN crystal is the ideler frequency light output of 1.88W, and this time-light conversion efficiency reaches 23.1%.Therefore in of the present utility model infrared coherent source device in all have higher power output and conversion efficiency in the infrared output wave band.
Compared with prior art, the utility model adopts the PPMgLN crystal of two cascades to realize quasi-phase matched optical parametric oscillator, relevant parameters such as the temperature by adjusting the PPMgLN crystal, cycle, under tuning wavelength scope 3～5 μ m conditions, obtained high-output power and high conversion efficiency in infrared coherent source, satisfied practical application request better.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present utility model.
Claims (8)
1. infrared coherent source device in a kind, it is characterized in that, described in infrared coherent source device comprise: pump laser, optical parameter resonant cavity and be arranged in described optical parameter resonant cavity and be fixed in two multiply periodic periodical poled crystals of cascade of temperature controlling stove; The pump light that is produced by described pump laser enters and carries out frequency inverted in the optical parameter resonant cavity that is built-in with described periodical poled crystal and vibration is amplified the back outgoing with infrared coherent light in producing; Described periodical poled crystal is period polarized magnesium oxide doped lithium niobate crystal.
2. infrared coherent source device is characterized in that in according to claim 1, and described pump laser is the Nd:YAG solid state laser of 1.064 μ m for output pumping optical wavelength.
3. infrared coherent source device in according to claim 1, it is characterized in that, described optical parameter resonant cavity comprises input mirror M1 and outgoing mirror M2, described input mirror M1 is the input coupling mirror, and the concave surface of described input mirror M1 is coated with 1.064 μ m anti-reflection films, 1.4～2 μ m high-reflecting films and 2.5～5 μ m anti-reflection films; Described outgoing mirror M2 is an output coupling mirror, and the concave surface of described outgoing mirror M2 is coated with 2.5～5 μ m anti-reflection films, 1.4～2 μ m high-reflecting films and 1.064 μ m anti-reflection films.
4. infrared coherent source device is characterized in that in according to claim 1, and described periodical poled crystal comprises the period polarized magnesium oxide doped lithium niobate crystal of two cascades, and its polarization cycle is between 26～31 μ m and with 0.5 μ m to be spaced apart.
5. infrared coherent source device is characterized in that in according to claim 4, described in infrared coherent source device also comprise the high-accuracy five dimension adjustment racks of adjustment cycle polarization magnesium oxide doped lithium niobate crystal period position.
6. infrared coherent source device is characterized in that in according to claim 1, and the adjustable temperature range of described temperature controlling stove is 40～200 ℃.
7. infrared coherent source device in according to claim 1, it is characterized in that, described in infrared coherent source device also comprise be successively set on being used between described pump laser and the optical parameter resonant cavity adjust pump light the polarization direction devating prism and to the girdle the waist lens of conversion of pump light; Described devating prism makes the z axle of the polarization direction of pump light and described periodical poled crystal parallel; Described lens make the parameter with a tight waist of pump light and the parameter matching with a tight waist of described optical parameter resonant cavity.
8. infrared coherent source device in according to claim 7, it is characterized in that, infrared coherent source device also comprises the filter plate of the plane output of being close to outgoing mirror M2 in described, is coated with 2.5～5 μ m anti-reflection films and 1.064 μ m and 1.4～2 μ m high-reflecting films on the described filter plate.
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| CN2009202057155U CN201518383U (en) | 2009-09-28 | 2009-09-28 | Mid-IR coherent optical source apparatus |
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| CN2009202057155U CN201518383U (en) | 2009-09-28 | 2009-09-28 | Mid-IR coherent optical source apparatus |
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| CN201518383U true CN201518383U (en) | 2010-06-30 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709805A (en) * | 2012-03-21 | 2012-10-03 | 清华大学 | Method and device for realizing laser with wavelength greater than 3.7 microns |
| CN104577700A (en) * | 2015-01-16 | 2015-04-29 | 南京大学 | Intermediate infrared laser device with tunable inner cavity OPO |
| CN104779515A (en) * | 2015-03-31 | 2015-07-15 | 南京大学 | High-power multi-component gas laser for remote detection |
| CN106451034A (en) * | 2016-10-21 | 2017-02-22 | 华北水利水电大学 | Enhanced terahertz wave radiation source of terahertz waves |
| CN110764240A (en) * | 2014-01-30 | 2020-02-07 | 卡伊拉布斯公司 | Device for processing optical radiation |
| CN112130395A (en) * | 2020-09-25 | 2020-12-25 | 山西大学 | Integral optical resonant cavity for frequency conversion |
| CN113363801A (en) * | 2021-05-22 | 2021-09-07 | 中国科学院理化技术研究所 | High-efficiency middle and far infrared laser device |
-
2009
- 2009-09-28 CN CN2009202057155U patent/CN201518383U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709805A (en) * | 2012-03-21 | 2012-10-03 | 清华大学 | Method and device for realizing laser with wavelength greater than 3.7 microns |
| CN110764240A (en) * | 2014-01-30 | 2020-02-07 | 卡伊拉布斯公司 | Device for processing optical radiation |
| CN110764240B (en) * | 2014-01-30 | 2021-06-01 | 卡伊拉布斯公司 | Device for processing optical radiation |
| CN104577700A (en) * | 2015-01-16 | 2015-04-29 | 南京大学 | Intermediate infrared laser device with tunable inner cavity OPO |
| CN104779515A (en) * | 2015-03-31 | 2015-07-15 | 南京大学 | High-power multi-component gas laser for remote detection |
| CN106451034A (en) * | 2016-10-21 | 2017-02-22 | 华北水利水电大学 | Enhanced terahertz wave radiation source of terahertz waves |
| CN106451034B (en) * | 2016-10-21 | 2018-10-30 | 华北水利水电大学 | A kind of terahertz radiation source of THz wave enhancing |
| CN112130395A (en) * | 2020-09-25 | 2020-12-25 | 山西大学 | Integral optical resonant cavity for frequency conversion |
| CN113363801A (en) * | 2021-05-22 | 2021-09-07 | 中国科学院理化技术研究所 | High-efficiency middle and far infrared laser device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100630 Termination date: 20120928 |