CN104779515A - High-power multi-component gas laser for remote detection - Google Patents
High-power multi-component gas laser for remote detection Download PDFInfo
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- CN104779515A CN104779515A CN201510150206.7A CN201510150206A CN104779515A CN 104779515 A CN104779515 A CN 104779515A CN 201510150206 A CN201510150206 A CN 201510150206A CN 104779515 A CN104779515 A CN 104779515A
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Abstract
A high-power multi-component gas laser for remote detection comprises a narrow-linewidth optical fiber amplifier pumping source (1), an optical refractor system (2), an optical parametric oscillator system (3) and a damping casing (4), wherein the narrow-linewidth optical fiber amplifier pumping source (1) injects pumping light into an optical parametric oscillation cavity (3) through the optical refractor system (2), 1,064 nm pumping light is converted into short-wavelength signal light and long-wavelength idler light in the optical parametric oscillation cavity through a nonlinear crystal of the optical parametric oscillator system (3), meanwhile, the signal light is oscillated in the cavity due to endoscope coatings of the oscillation cavity, and long-wavelength intermediate infrared wave band laser is output; the optical parametric oscillator system (3) comprises coated endoscopes, the nonlinear crystal adopting a cascade connection structure as well as a high-precision temperature control furnace; the cascade connection structure with two periods including 28.5 mu m and 30.3 mu m is arranged on the nonlinear crystal in the longitudinal direction; output wavelengths are tuned through control of the crystal temperature.
Description
Technical field
The present invention relates to middle infrared laser.Particularly based on quasi-phase matched OPO (optical parametric oscillation) principle, the tunable middle infrared laser of output wavelength.
Background technology
Along with industrialization with modernly to advance by leaps and bounds, environmental pollution also becomes more serious, and environmental pollution has become the common difficulty that the 21 century mankind face.Many dusty gass in an atmosphere content are lower, but must strictly detect, as oxysulfide, and nitrogen oxide, methane, sulfur dioxide etc.Therefore.When detecting these light concentration gas, require that detection method has higher sensitivity.At present, the method for sensitive gas detect has a variety of.With regard to optical means, tunable diode laser absorption spectroscopy (TDLAS) is the typical method that highly sensitive gas concentration detects, and this method also has high speed simultaneously, high-resolution, noncontact, can the advantage such as real time on-line monitoring.TDLAS detection method requires to use the good LASER Light Source of single mode character, requires that live width is in MHz magnitude.Common light source adopts semiconductor laser with tunable, and due to the character of itself, power is everlasting small-power (<30mW), cannot telemeasurement.The present invention utilizes fiber amplifier to the invariant feature of seed light frequency, as the pumping source of conversion infrared in OPO, to carry out in laser infrared frequency and transforms, so realize frequency change and seed source change consistent in infrared output.
Be that the light of 0.75 micron to 1000 microns is called infrared ray by wave-length coverage in spectroscopy, wherein the general light by 3 to 20 microns is called mid-infrared light.The light of this wave band has a lot of characteristic, especially 3 to 5 micron wavebands, and when the light of this wave band transmits in an atmosphere, loss is lower, is very important air infrared window; Except this, this wave band also covers the absworption peak of a lot of hydrocarbon gas and other a lot of toxic gases.Therefore the laser of this wave band may be used for directional ir interference, laser ranging, spectrum analysis, atmosphere pollution monitoring, poisonous gas detection etc.
The mode of current acquisition mid-infrared laser roughly has several below: the optical parametric oscillator (OPO) of gas laser, quantum cascade laser, diode laser, solid state laser and pumping light thereof, wherein along with as the solid state laser of OPO pumping source and the fast development of fiber laser, the continuous appearance of new nonlinear crystals measured material, mid infrared laser achieves major progress, becomes the important means obtaining mid-infrared laser and export.
Optical parametric oscillator has a lot of advantage when producing Laser output: tuning range extensively, not retrains by pump wavelength; Can use multiple nonlinear crystal, and tuning manner is various, comprises thermal tuning, cycle tuning, angle tuning etc.; Compact conformation, can all solidstate, the stability of a system strengthens; High-power, high light beam quality, narrow linewidth output etc. can be realized.
OPO technology was just suggested as far back as 1962, theoretical by constantly perfect, was experimentally limited to pumping source and nonlinear crystal, had been difficult to important breakthrough always.Until the eighties in last century, along with the appearance of the crystal of match based on birefringence position (BPM), and the development of all solid state laser of semiconductor pump, OPO technology has had very large breakthrough.
The optical super lattice material based on Quasi phase matched (QPM) technology grown up the nineties in last century, as period polarized lithium tantalate (PPLT), lithium niobate (PPLN), mg-doped lithium niobate (PPMgO:LN), potassium titanium oxide phosphate etc., there is the advantage that wide, the effective second order nonlinear coefficient of transparency range is large, absorption loss is little, optic damage threshold value is high, OPO technology has been pushed to a new height.
Annular cavity optical parametric oscillation method is the method obtaining high-power mid-infrared laser, and current middle infrared laser is commonly duralumin, the metal materials such as steel.When Output of laser, the savings of heat can make metal material generation thermal deformation like this, the thermal deformation of metal can make pumping laser bundle be changed by the position of crystal, thus the wavelength power of Output of laser is had an impact, associated laser application cannot be reached as probe gas etc.
Summary of the invention
The object of the invention is, propose a kind of lasing light emitter that can be used for dusty gas and detect.Requirement be power output large (>1.5W) to reach the requirement of distance measuring, Output of laser frequency is consistent with the tunable semiconductor frequency change of front end.And stability is high, not emergence pattern saltus step, precisely can aim at the absworption peak of gas.Simultaneously because this laser is based on quasi-phase matched OPO principle (optical parametric oscillation), the adjustment of output wavelength can be achieved in a big way.
Technical scheme of the present invention is: a kind of high-power remote probe multicomponent gas laser, comprises narrow linewidth fiber amplifier pumping source (1), optics folding mirror system (2), optical parametric oscillator system (3), damping shell (4).Described narrow linewidth fiber amplifier pumping source (1) rolls over mirror system (2) by pump light injection optics optical parametric osoillator (3) by optics.By nonlinear crystal in resonant cavity, 1064nm pump light is converted into short wavelength's flashlight and long wavelength's ideler frequency light, simultaneously because the cavity mirror plating film of resonant cavity makes to vibrate in signal optical cavity, exports the middle-infrared band Laser output of long wavelength.
Narrow linewidth fiber amplifier pumping source (1), its output wavelength is 1064nm, and linewidth requirements is the infrared laser of <50MHz, power >20W;
Optics parametric oscillator (opo) adopts annular chamber design.
Described optical parametric oscillator system (3), is made up of plated film chamber mirror, cascade structure nonlinear crystal, high precision temperature control stove three part; Described plated film chamber mirror, each chamber mirror needs to plate multilayer film, and parameter is 532nmHR, 1064nmHT, 1.4 μm of-2.1 μm of HR, 3 μm of-4 μm of HT.M1, M2 are flat mirror, and M3, M4 are concave mirror, radius of curvature R=-100mm.
Described cascade structure nonlinear crystal, arranges two kinds of cycles 28.5 μm in the vertical, and the nonlinear crystal structure of 30.3 microns makes 1064nm pump light successively by nonlinear crystal, and occurrence frequency is changed.Tuning operation wavelength is carried out by controlling crystal temperature effect.
Temperature controlling stove body of heater is ceramic structure, reduces thermal deformation, and its control circuit part adopts PID control circuit, thermometric original paper to be precision be 0.01 high precision thermosensitive resistor PT100.
Damping shell (4), the connection of shell and light path board is soft connection, avoids the impact of the higher-order of oscillation on light path.
Beneficial effect of the present invention, power output of the present invention large (>1.5W) is to reach the requirement of distance measuring, and Output of laser frequency is consistent with the tunable semiconductor frequency change of front end.And stability is high, not emergence pattern saltus step, precisely can aim at the absworption peak of gas.This laser, based on quasi-phase matched OPO principle (optical parametric oscillation), can achieve the adjustment of output wavelength in a big way.Because stand for optical lens component size used is half inch of size, greatly reduce single unit system volume.Absorbable organic halogens of the present invention obtains the characteristic absorption peak 3.3 μm of methane and sulfur dioxide, the high power CW laser at 4 mum wavelength places.
Accompanying drawing explanation
Fig. 1 is single unit system figure of the present invention;
Fig. 2 is index path of the present invention;
Fig. 3 is light path bottom plate apparatus of the present invention;
Fig. 4 is the present invention's 28.5 μm of period crystals temperature adjusting curves;
Fig. 5 is the present invention's 30.3 μm of period crystals temperature adjusting curves.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The present invention adopts the pumping source of 1064nm fiber amplifier as OPO of industrial production maturation, and 1 is injected in optical resonator by optical fiber beam expansion colimated light system.The periodical poled crystal of certain doping content is placed in the place with a tight waist of internal oscillation basic mode.By nonlinear crystal, 1064nm non-linear frequency is converted into the ideler frequency light of short wavelength and the flashlight of long wavelength, and cavity mirror plating film is high anti-to short wavelength's ideler frequency light simultaneously, and flashlight is thoroughly high, to make ideler frequency light vibrate in chamber, and flashlight infrared in output.
The non-linear of use mixes Mg lithium columbate crystal, and export 3.3 μm, 4 μm to obtain same crystal, design crystal structure is cascade structure.So-called cascade structure is exactly that (non-linear Mg lithium niobate of mixing is for generation of OPO for the crystal in two kinds of cycles, can see the applicant in first patent application) simultaneously in a passage, the front end crystal cycle 28.5 microns, the rear end crystal cycle is 30.3 microns, regulating and controlling temperature utilizes the periodic crystal structure of front end to produce 4 microns of outputs, utilizes the periodic crystal structure of rear end to produce 3.3 microns of outputs.In resonant cavity, adding etalon in order to accurately aiming at absworption peak, making output wavelength more accurate.
Described chamber mirror is the little eyeglass of half centimeter of diameter.Light path adopts turnover to export, and greatly reduces the volume of single unit system, makes device more small and exquisite, convenient.
All optical elements of the present invention are fixed on high rigidity aluminium sheet, in order to avoid vibrations are on light path impact, and then affect output wavelength.Take high hard aluminium sheet to be connected with shell is soft, embodiment is: sidewall has internal thread in the enclosure, takes press-down type to compress base plate, in (the side, contact position of base plate and shell, bottom) there is flexible material to adhere to, avoid hard contact, also just avoid vibrations and transmit.
As shown in Figure 1, a kind of high-power remote probe multicomponent gas laser, comprises OPO annular chamber (1), light path base plate (2), damping shell (3), 1064 pumping source beam-expanding collimation systems (5), folding mirror system (6).Fiber amplifier (5) passed through in Fig. 1 are injected in OPO through folding mirror system (6) and nonlinear optical frequency change occur, and export mid-infrared laser, through the outgoing of folding mirror.
As shown in Figure 2, be the index path of this invention.The 1064nm that fiber amplifier is launched penetrates through beam-expanding collimation system (V), through turning mirror (L1) by polarizer (L4), light is made to be vertical polarization, turning through turning mirror (L2), making the beam waist position of laser be positioned at germ nucleus by assembling convex lens (f).After lens, pump light is injected in optics parametric oscillator (opo) (OPO) through plano-concave lens (M2), four chamber mirrors form optics parametric oscillator (opo) (OPO), four cavity mirror platings have multiple film, parameter is as follows: 532nmHR, 1064nmHT, 1.4 μm of-2.1 μm of HR, 3 μm of-4 μm of HT.M1, M2 are concave mirror, and radius of curvature R=-100mm, M3, M4 are flat mirror.Periodic polarized crystal selects cascade PPMgLN, and two cycles are 28.5 μm and 30.3 μm.Convex lens (f) assembled by optics folding mirror system used two 90 degree of speculums and, and eyeglass is CaF2 material, reduce light loss, light path sold off, greatly reduces the size of single unit system.
As shown in Figure 4,5, control the consecutive variations wavelength that crystal temperature effect the subject of knowledge and the object of knowledge produces, utilize 28.5 μm of cycle portions of crystal, control temperature is at 378K, and non-linear frequency is converted into 1.44 μm, 4 μm of laser, chamber mirror is high anti-to 1.44 mu m wavebands, make it to vibrate in chamber, high to 4 μm, thus export 4 μm of laser that can be absorbed by sulfur dioxide.Utilize 30.3 μm of cycle portions of crystal, control temperature is at 400K, and non-linear frequency is converted into 1.56 μm, 3.3 μm of laser, chamber mirror is high anti-to 1.56 mu m wavebands, makes it to vibrate in chamber, high to 3.3 μm, thus output can by 3.3 of methane adsorption μm laser.Finally realize one piece of crystal control temperature and produce different wave length Laser output.
If Fig. 2 is in order to ensure the accurate of output wavelength, we add etalon (N) in optics parametric oscillator (opo).
The burner arrangement of the present invention's design is divided into body of heater and bell two large divisions, and stove is connected with light path base plate screw, and stove is ceramic material, avoids thermal deformation.Heating rod and temperature-sensitive element are placed therein, and bell wraps crystal from surrounding, make crystal temperature effect balanced.
In order to avoid external shock is on the impact of output wavelength, the connected mode of we are well-designed light path base plate and shell.As Fig. 3, we place flexible material in light path base plate surrounding, take lower press to guarantee the stability of base plate.Avoid the impact of external shock on light path base plate.L-type clamper between light path base plate and shell, by with the madial wall of shell is threaded fixing, avoid and base plate rigid connection, bottom L-type clamper L-type, be lined with rubber, foam or other flexible materials.Light path base plate takes press-down type fixed base plate.
Claims (7)
1. a high-power remote probe multicomponent gas laser, is characterized in that comprising narrow linewidth fiber amplifier pumping source (1), optics folding mirror system (2), optical parametric oscillator system (3), damping shell (4); Described narrow linewidth fiber amplifier pumping source (1) rolls over mirror system (2) by pump light injection optics optical parametric osoillator (3) by optics; By optical parametric oscillator system (3) nonlinear crystal in optical parametric oscillation, 1064nm pump light is converted into short wavelength's flashlight and long wavelength's ideler frequency light, simultaneously because the cavity mirror plating film of resonant cavity makes to vibrate in signal optical cavity, export the middle-infrared band Laser output of long wavelength;
Narrow linewidth fiber amplifier pumping source (1), its output wavelength is 1064nm, and live width is the infrared laser of <50MHz, power >20W;
Optics parametric oscillator (opo) adopts annular chamber design;
Described optical parametric oscillator system (3), is made up of plated film chamber mirror, cascade structure nonlinear crystal, high precision temperature control stove three part;
Described cascade structure nonlinear crystal, arranges two kinds of cycles 28.5 μm in the vertical, and the nonlinear crystal structure of 30.3 microns makes 1064nm pump light successively by nonlinear crystal, and occurrence frequency is changed; Tuning operation wavelength is carried out by controlling crystal temperature effect.
2. high-power remote probe multicomponent gas laser according to claim 1, is characterized in that temperature controlling stove body of heater is ceramic structure, and its control circuit part adopts PID control circuit, thermometric original paper to be precision be 0.01 high precision thermosensitive resistor PT100.
3. high-power remote probe multicomponent gas laser according to claim 1, is characterized in that being provided with damping shell (4), and the connection of damping shell and light path board is soft connection.
4. high-power remote probe multicomponent gas laser according to claim 1, is characterized in that described plated film chamber mirror, and each chamber mirror needs to plate multilayer film, and parameter is 532nmHR, 1064nmHT, 1.4 μm of-2.1 μm of HR, 3 μm of-4 μm of HT; M1, M2 are flat mirror, and M3, M4 are concave mirror, radius of curvature R=-100mm.
5. high-power remote probe multicomponent gas laser according to claim 1, is characterized in that described chamber mirror is the little eyeglass of half centimeter of diameter.
6. high-power remote probe multicomponent gas laser according to claim 1, it is characterized in that convex lens (f) assembled by optics folding mirror system (2) used two 90 degree of speculums and, eyeglass is CaF2 material.
7. high-power remote probe multicomponent gas laser according to claim 1, is characterized in that light path base plate surrounding places flexible material, takes lower press; Be provided with L-type clamper between light path base plate and shell, by clamper with the madial wall of shell is threaded fixing, clamp base is lined with rubber, foam or other flexible materials.
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| CN105680309A (en) * | 2016-04-06 | 2016-06-15 | 南京大学 | Compact-structure picosecond pulse wide-tuning mid-infrared laser |
| CN110058371A (en) * | 2019-04-08 | 2019-07-26 | 武汉光迅科技股份有限公司 | A kind of optical module |
| CN115541521A (en) * | 2022-11-03 | 2022-12-30 | 哈尔滨翰奥科技有限公司 | Method for measuring concentration of multiple gases by infrared band laser |
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Application publication date: 20150715 |