CN107919603A - A kind of combined interference chamber for the selection output of chemical laser wavelength - Google Patents
A kind of combined interference chamber for the selection output of chemical laser wavelength Download PDFInfo
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- CN107919603A CN107919603A CN201610878569.7A CN201610878569A CN107919603A CN 107919603 A CN107919603 A CN 107919603A CN 201610878569 A CN201610878569 A CN 201610878569A CN 107919603 A CN107919603 A CN 107919603A
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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
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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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
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Abstract
The present invention relates to a kind of combined interference chamber for the selection output of chemical laser wavelength, which, which uses, stablizes cavity configuration, including a concave mirror, 45 degree of beam splitting chips, two plane mirrors.The reflecting surface of wherein 45 degree of beam splitting chips and two sub- chambers of plane mirror composition interference, concave mirror and plane mirror is coated with the reflectance coating for having different reflectivity for different wave length laser respectively.By the albedo parameters for controlling laser resonator intracavitary optical element, wavelength progress roughing to laser is selected, by adjusting the parameters such as the length for interfering sub- chamber, the splitting ratio of beam splitting chip, utilize interference effect, adjacent closely wavelength is finely selected, realizes the output of any single wavelength laser of laser.
Description
Technical field
The invention belongs to chemical laser field, and in particular to a kind of combination for the selection output of chemical laser wavelength is done
Relate to chamber.
Background technology
Mid-infrared laser device is operated in atmospheric window wave band, in laser spectroscopy, laser remote sensing, environmental monitoring, laser doctor
Treat has important application value and prospect with fields such as infrared counteractions.In recent years, mid-infrared laser device obtained both at home and abroad
The highest attention of R＆D institution has simultaneously obtained development at full speed.
Pneumatics is incorporated into chemical laser from Spencer in 1969 et al., solves the quick mixed of reactant
It has been closed that, since realizing First continuous wave hydrogen fluoride/fluorination deuterium (HF/DF) laser, HF/DF lasers become development at present most
Infrared light laser system in ripe, on the largest scale.For CW HF laser, the basic principle that laser produces is NF3And D2
Burning generation F atom in a combustion chamber, 2NF3+2D2→N2+4DF+2F；Air-flow containing F atom expands cold by supersonic nozzle
Rear and H2Molecule reaction generation excitation state HF (v, J) molecule, F+H2→HF(v,J)+H；The HF (v, J) of excitation state is humorous in optics
Stimulated emission in chamber of shaking forms the laser that wavelength is 2.5-3.1 μm, HF (v, J)+hv → HF (v-1, J+1)+2hv.Since use
After actuation techniques of burning and supersonic speed hybrid technology, CW HF laser is developed rapidly, the ALPHA's that the U.S. is built
HF laser output powers have had reached MW magnitudes.
Traditional CW HF laser exports spectral line by the transition between HF molecule difference vibration levels and rotational energy level
Produce, belong to typical multiline output, and the aqueous vapor in air can produce strong absorption to the laser of most of HF wavelength, this
The practical application of HF lasers is just seriously affected.Middle infrared band atmospheric transmission spectrum research shows, in HF laser wavelength ranges
Micro- window inside very narrow there are many line widths but with preferable atmospheric transmittance, this is provided for the practical application of CW HF laser
Advantage.Early in the HF laser early stages of development, Single wavelength laser, which exports, just causes the interest of people, carried out Single wavelength and
The experimental study of selective multiwavelength laser output.Numerous studies show, in traditional HF chemical lasers, some specific wavelengths
Laser output power and efficiency are all very low, and which limits the use of laser.
From laser technology, the approach for obtaining the output of simple spectrum line laser mainly has two kinds, and one kind is by improving single ripple
Long gain, obtains Single wavelength laser by mode competition and exports；Another kind is to increase other wavelength using dispersion element
Loss, suppresses its vibration so as to obtain single wavelength output.Some gases point are utilized mostly for INFRARED SPECTRUM segment molecule laser
The selective absorbing of son, or realize Single wavelength laser using the effect of dispersion of grating or prism.However, the choosing of gas molecule
Though selecting property Absorption Line is more, the gain for the wavelength to be suppressed cannot be all matched；Grating and prism are not easy to delicately adjust
The relation of gain loss between two wavelength that distance is sufficiently close to.
Using the method for hysteroscope plated film, required wavelength light is produced reflection in resonator and vibrate, other wavelength are from resonance
Intracavitary high transmission, however, it would be possible to realize that Single wavelength laser exports, but reach tens in middle infrared band, processing resolving accuracy
The hysteroscope of nanometer is very difficult.For HF lasers, the interval of adjacent two nearest wavelength only has 1nm, current optical coating
Technology is unable to reach so narrow reflection or transmission bandwidth, therefore realizes that the output of single wavelength laser becomes using new technology
It is very necessary.It is a kind of common laser longitudinal mode selection method to carry out model selection to laser using principle of interference, it passes through tune
The fine transmission window of whole interfered device, makes laser there was only a longitudinal mode output, common to have F- so as to fulfill single longitudinal mode laser
P etalons, Michelson interferometers, Fox-Smith interferometers etc..Combined interference chamber is to replace light using interferometer system
One end mirror of chamber, due to interference effect so that interferometer shows as incidence wave to the composite reflectivity of intracavity beam
Long function, so as to fulfill a kind of resonator of laser modeling.But the resolution that chemical laser wavelength is carried out using these methods is selected
Select and do not appear in the newspapers.
By above-mentioned analysis, it is necessary to it is a kind of can effectively to chemical laser output wavelength carry out fine resolution method,
And avoid introducing excess loss to resonator.The present invention, which realizes, meets that above-mentioned chemical laser realizes single wavelength output
Demand.
The content of the invention
It is an object of the invention to solve above-mentioned technical problem, there is provided one kind is defeated using combined interference chamber selection optical maser wavelength
The chemical laser gone out.Using high-accuracy wavelength cut out tab as resonant cavity mirror, by the reflectivity for controlling cut-off speculum
Parameter, the wavelength progress roughing to laser is selected, by adjusting the parameters such as the length for interfering sub- chamber, beam splitting chip reflectivity to wavelength
Selected control is carried out, so as to fulfill the purpose of the single output of any wavelength laser.
To achieve the object of the present invention, particular technique solution is：
Using the chemical laser of combined interference chamber selection optical maser wavelength output, its main feature is that the resonator bag of the laser
Include concave surface cut-off speculum, laser gain area, 45 degree of beam splitting chips and two plane cut-off speculums.Wherein concave surface cut-off reflection
Mirror is coated with short-wavelength light high transmittance, the deielectric-coating of long wavelength light high reflectance；It is anti-that one plane of 45 degree of beam splitting chips is coated with half
Penetrate the deielectric-coating of half transmitting；First plane cut-off speculum is coated with short-wavelength light high transmittance, Jie of long wavelength light high reflectance
Plasma membrane；Second plane cut-off speculum is coated with a section wavelength light high reflectance, the deielectric-coating of long wavelength light high transmittance.End concave surface
Speculum carries out roughing to optical maser wavelength with two plane cut-off speculums and selects.First plane cut-off speculum, 45 degree of beam splitting chips
The sub- chamber of interference is collectively formed with the second plane cut-off speculum, ends speculum collective effect with concave surface, to close adjacent ripple
Length is finely selected, and is exported so as to fulfill the single selection of any wavelength laser.
The present invention is as follows using the course of work of the chemical laser of combined interference chamber selection optical maser wavelength output：
The outlet port of the optical cavity position supersonic nozzle of laser.For the laser of any single wavelength of HF laser, example
Such as it is coated with respectively for the laser that centre wavelength is 2.87 μm, resonator concave surface cut-off speculum and the first plane cut-off speculum
2.50 μm of -2.83 mum wavelength light transmission>95%, 2.87 μm of -3.10 mum wavelength light reflectivity>99% deielectric-coating.Work as laser
Device run when, wavelength less than 2.87 μm radiant light by concave surface end speculum and the first plane cut-off speculum when almost
All fall through cavity lens loss, only radiant light of the wavelength more than 2.87 μm could be realized in intracavitary and reflected.This partial radiation light
After 45 degree of reflection beam splitting chips, reflected by the second plane cut-off speculum.Second plane cut-off speculum is coated with
2.50 μm of -2.83 mum wavelength light reflectivity>99%, 2.90 μm of -3.10 mum wavelength light transmission rate>95% deielectric-coating.So warp
Cross the radiant light that the second plane cut-off speculum is reflected and be only left wavelength as the radiant light near 2.87 μm, realize laser
The roughing of wavelength is selected.The piezoelectric ceramics in the second plane cut out tab is driven, the length of sub- chamber interfere arm is interfered in adjustment.Utilize interference
Effect so that the radiant light of closely coupled two wavelength, the light of a wavelength is positioned at the reflection peak for interfering sub- chamber equivalent reflectivity
Value, the light of another wavelength in the process, carry out optical maser wavelength selected positioned at the valley for interfering sub- chamber equivalent reflectivity
Select.
The present invention has the following advantages：
Conventional selection method is not easy to the close two adjacent spectral lines of fine resolution, and dispersion as used dispersion chamber
Element damage threshold value is relatively low, is not suitable in the laser of relatively high power.Laser ripple is carried out using interferometer combined resonator
Long selection output, the antibody Monoclonal threshold value of optical element is high, and avoids larger insertion loss.Using cut-off speculum as
Hysteroscope carries out roughing to wavelength and selects, and close adjacent wavelength is finely selected using interference effect using the sub- chamber of interference thereafter
Select, it is possible to achieve the output of any single wavelength laser.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of combined interference chamber for the selection output of chemical laser wavelength of the present invention.
Fig. 2 is that speculum is ended in concave surface in a kind of combined interference chamber for the selection output of chemical laser wavelength of the present invention
With the transmissivity distribution map of the first plane cut-off speculum.
Fig. 3 is that the cut-off of the second plane is anti-in a kind of combined interference chamber for the selection output of chemical laser wavelength of the present invention
Penetrate the transmissivity distribution map of mirror.
Fig. 4 is to interfere sub- chamber equivalent anti-in a kind of combined interference chamber for the selection output of chemical laser wavelength of the present invention
Rate is penetrated with wavelength change distribution map.
Fig. 5 is that a kind of combined interference chamber equivalent power for the selection output of chemical laser wavelength of the present invention becomes with wavelength
Change distribution map.
Embodiment
As shown in Figure 1, a kind of combined interference chamber for the selection output of chemical laser wavelength, the laser resonant cavity
Including concave surface cut-off speculum 1,2,45 degree of laser gain area beam splitting chip 3, the first plane cut-off speculum 4, the cut-off of the second plane
Speculum 5.All optical elements are each attached on the shock insulation platform in vacuum storehouse.The optical axis of optical cavity ends by concave surface respectively
Speculum 1,2,45 degree of laser gain area, 3 reflecting surface of beam splitting chip, the first plane cut-off speculum 4, the second plane cut-off speculum 5
Center.First plane cut-off speculum, 4,45 degree of 3 and second plane of beam splitting chip cut-off speculums 5 collectively form laser optical cavity
The sub- chamber of interference；First plane is ended speculum 4 and is oppositely arranged with the second plane cut-off speculum 5, respectively positioned at 45 degree of beam splitting
The both sides of piece 3；First plane cut-off speculum 4 to 45 spends the distance L at 3 reflecting surface center of beam splitting chip3=100mm, the second plane
End the distance L that speculum 5 to 45 spends 3 reflecting surface center of beam splitting chip2=97mm；End speculum 1 and interfere sub- chamber phase in concave surface
To setting, the distance at 3 reflecting surface center of beam splitting chip is spent positioned at the both sides in laser gain area 2, concave surface cut-off speculum 1 to 45 respectively
L1=1600mm.
The concave surface plating of resonator inner concave cut-off speculum 1 and the reflecting surface of the first plane cut-off speculum 4 are coated with 0 respectively
Degree is incident, 2.50 μm of -2.83 mum wavelength light transmission>95%, 2.87 μm of -3.10 mum wavelength light reflectivity>99% deielectric-coating,
As shown in Figure 2；The plane plating of concave surface cut-off speculum 1 and the another side of the first plane cut-off speculum 4 are coated with 0 degree and enter respectively
Penetrate, 2.50 μm of -3.10 mum wavelength light transmission>99.5% deielectric-coating.One plane of 45 degree of beam splitting chips 3 is coated with 45 degree and enters
To penetrate, the deielectric-coating of 2.50 μm of -3.10 mum wavelength light reflectivity=50%, the second plane of 45 degree of beam splitting chips 3 is coated with 45 degree of incidences,
2.50 μm of -3.10 mum wavelength light transmission>99.5% deielectric-coating.The reflecting surface of second plane cut-off speculum 5 is coated with 0 degree and enters
Penetrate, 2.50 μm of -2.83 mum wavelength light reflectivity>99%, 2.90 μm of -3.10 mum wavelength light transmission>95% deielectric-coating, such as schemes
Shown in 3；The another side of second plane cut-off speculum 5 is coated with 0 degree of incident 2.50 μm of -3.10 mum wavelength light transmission>99.5%
Deielectric-coating.
Exported for the laser of any single wavelength of HF laser, such as the laser that centre wavelength is 2.87 μm.When
When laser is run, 2 generation wavelength of laser gain area is 2.50-3.10 μm of radiant light, these radiant lights end anti-by concave surface
After penetrating mirror 1, the radiant light that wavelength is 2.50 μm -2.83 μm mostly loses through concave surface cut-off speculum 1, and wavelength is 2.87 μ
M-3.10 μm of radiant light is further amplified by the concave surface cut-off total reflection of speculum 1 by laser gain area 2.End through concave surface
Remaining 2.50 μm -2.83 μm micro radiant lights end after 45 degree of beam splitting chips 3 reflect by the first plane after speculum 1 is lost
Speculum 4 all loses.The radiant light that wavelength is 2.87 μm -3.10 μm passes through first again after 45 degree of beam splitting chips 3 reflect
Plane cut-off speculum 4 reflects, and the light being reflected back incides the second plane cut-off speculum 5 by 45 degree of beam splitting chips 3.Wavelength
End speculum 5 through the second plane for 2.90 μm -3.10 μm of radiant lights to lose, be left wavelength as the spoke near 2.87 μm
Light is penetrated, the roughing for realizing optical maser wavelength at this time is selected.This partial radiation light is ended by 45 degree of beam splitting chips 3 in the first plane to be reflected
4 and second plane of mirror cut-off speculum 5 produces interference back and forth, interferes sub- chamber to be equivalent to a reflectivity and vibrates light wave for intracavitary
The hysteroscope of long function, its equivalent reflectivity can be provided by formula 1.Made pottery by driving the first plane to end the piezoelectricity on speculum 4
Porcelain, adjusts the distance between the first plane cut-off speculum 4 and 45 degree of beam splitting chips 3 L3So that interfere sub- chamber equivalent reflectivity with
The distribution of wavelength change is as shown in Figure 4.R in formula 13、R4、R5Respectively 45 degree of beam splitting chips 3,4 and of the first plane cut-off speculum
Second plane ends the reflectivity of speculum 5, T3For the transmitance of 45 degree of beam splitting chips 3.π (the L of δ=42+L3)/λ is the phase produced
Change, λ are the wavelength of light.By Fig. 4 it can be seen that the light of centre wavelength is located at reflection peak, and the light of adjacent wavelength is located at ripple
Long valley, returns intracavitary positioned at the light reflection of wavelength peak and passes through laser gain area 2, produce and shake between concave surface cut-off speculum 1
Amplification is swung, forms laser output；And the light transmission positioned at reflection valley goes out to interfere sub- cavity loss to fall, so as to fulfill the fine of wavelength
Selection, finally realizes the single wavelength output of laser.Fig. 5 for equivalent power with Wavelength distribution figure, from the figure, it can be seen that center
Rarely has the output of other wavelength lasers beyond wavelength departure ± 0.5nm.
The present invention can realize that any HF/DF chemical lasers single wavelength exports, the damage-retardation of optical element in laser chamber
Hinder threshold value height, and avoid larger insertion loss.It can be applied to the chemical laser output of higher-wattage.
Claims (5)
- A kind of 1. combined interference chamber for the selection output of chemical laser wavelength, it is characterised in that：It is a laser resonator Chamber, the laser resonant cavity include concave surface cut-off speculum (1), laser gain area (2), 45 degree of beam splitting chips (3), the first plane section Only speculum (4), the second plane cut-off speculum (5)；First plane cut-off speculum (4), 45 degree of beam splitting chips (3) and the second plane cut-off speculum (5) collectively form laser The sub- chamber of interference of optical cavity；First plane cut-off speculum (4) is oppositely arranged with the second plane cut-off speculum (5), is located at respectively The both sides up and down of 45 degree of beam splitting chips (3)；The geometric center of first plane cut-off speculum (4) is into 45 degree of beam splitting chip (3) geometry The distance of the heart and the difference of geometric center to the distance of 45 degree of beam splitting chip (3) geometric centers of the second plane cut-off speculum (5) are 3mm；Concave surface cut-off speculum (1) and the sub- chamber of interference are located at the left and right sides of laser gain area (2) respectively；Concave surface cut-off speculum (1), 45 degree of beam splitting chips (3) are coaxially disposed, and are referred to as A axis；45 degree of beam splitting chips (3), first planes Cut-off speculum (4), the second plane cut-off speculum (5) are coaxially disposed, and are referred to as B axle；A axis intersects vertically with B axle.
- 2. a kind of combined interference chamber for the selection output of chemical laser wavelength according to claim 1, its feature exist In：The concave surface of the concave surface cut-off speculum (1) is coated with 0 degree of incident, 2.50 μm of -2.83 mum wavelength light transmission>95%, 2.87 μm of -3.10 mum wavelength light reflectivity>99% deielectric-coating；The plane of concave surface cut-off speculum (1) is coated with 0 degree of incidence, 2.50 μm of -3.10 mum wavelength light transmission>99.5% deielectric-coating；One plane of 45 degree of beam splitting chips (3) is coated with 45 degree of incidences, and 2.50 μm of -3.10 mum wavelength light reflectivity is 50% Deielectric-coating, the second plane of 45 degree of beam splitting chips (3) is coated with 45 degree of incident, 2.50 μm of -3.10 mum wavelength light transmissions>99.5% Deielectric-coating.
- 3. a kind of combined interference chamber for the selection output of chemical laser wavelength according to claim 1, its feature exist In：The reflecting surface of the first plane cut-off speculum (4) is coated with 0 degree of incident 2.50 μm of -2.83 mum wavelength light transmission> 95%, 2.87 μm of -3.10 mum wavelength light reflectivity>99% deielectric-coating；The another side of first plane cut-off speculum (4) is coated with 0 degree of incident 2.50 μm of -3.10 mum wavelength light transmission>99.8% deielectric-coating；The second plane cut-off speculum (5) Reflecting surface is coated with 0 degree of incident, 2.50 μm of -2.87 mum wavelength light reflectivity>99%, 2.90 μm of -3.10 mum wavelength light transmission> 95% deielectric-coating；The another side of second plane cut-off speculum (5) is coated with 0 degree of incident 2.50 μm of -3.10 mum wavelength light transmission Rate>99.5% deielectric-coating.
- 4. a kind of combined interference chamber for the selection output of chemical laser wavelength according to claim 1, its feature exist In：Described concave surface cut-off speculum (1), laser gain area (2), 45 degree beam splitting chips (3), the first plane end speculum (4), Second plane cut-off speculum (5) is collectively disposed in vacuum storehouse；It is concave surface cut-off speculum (1), 45 degree of beam splitting chips (3), first flat Face cut-off speculum (4) and the second plane cut-off speculum (5) are respectively placed on shock insulation platform.
- 5. a kind of combined interference chamber for the selection output of chemical laser wavelength according to claim 1, its feature exist In：The second plane cut-off speculum (5) is placed on piezoelectric ceramics, and piezoelectric ceramics is driven by piezoelectric ceramic actuator and controlled System, for Output of laser wavelength, utilizes the closed loop feedback control of voltage and the sub- chamber brachium of the relational implementation of light intensity interference.
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Cited By (1)
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| CN110706473A (en) * | 2019-09-06 | 2020-01-17 | 南京工程学院 | Gas data acquisition device and data acquisition method based on single-wavelength reflection |
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