CN106785879B - A kind of device and its operating method increasing chemical laser population inversion - Google Patents
A kind of device and its operating method increasing chemical laser population inversion Download PDFInfo
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- CN106785879B CN106785879B CN201510812304.2A CN201510812304A CN106785879B CN 106785879 B CN106785879 B CN 106785879B CN 201510812304 A CN201510812304 A CN 201510812304A CN 106785879 B CN106785879 B CN 106785879B
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/22—Gases
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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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Abstract
The present invention provides a kind of device and its operating method for increasing chemical laser population inversion.This method is using a branch of continuous wave infrared laser as induction optical coupling entering light chamber, the specific rotation quantum state that vibrational quantum number in hydrogen fluoride chemical Laser System is v=1 is induced on the rotation quantum state of vibration number v=0, to increase the population inversion between the specific rotating state on vibrational quantum number v=2 in specific rotating state and vibrational quantum number v=1, to enhance laser output energy.The method also can operate with other chemical laser systems in principle.
Description
Technical field
The present invention relates to a kind of increase hydrogen fluoride or the methods of other chemical laser population inversion, belong to laser technology neck
Domain.
Background technique
Chemical laser is to generate the population inversion of gain media by heat-producing chemical reaction and obtain in oscillation chamber
The device of laser.Continuous wave (Continuous is successfully demonstrated for the first time from American scientist D.J.Spencer in 1969 et al.
Wave, CW) fluorination deuterium, hydrogen fluoride (Fluoride Deuterium/Fluoride Hydrogen, DF/HF) chemical laser with
Come, CW DF/HF chemical laser is just with its distinctive advantage, and such as continuous light power is high, engineering amplification performance is good, does not need
Additional power source, DF laser wavelength there is good characteristics of atmospheric transmission, general frequency HF laser has short wavelength's feature etc., always times
It is concerned, it is developed rapidly in twentieth century the seventies and eighties.
The research of CW DF/HF chemical laser is taken to from eighties of last century the seventies in China.Successively succeed in developing electricity
Arc hot type, burn driving CW DF/HF chemical laser and general frequency CW HF chemical laser.By more than 30 years exert
Power, output power significantly improve, and beam quality has obtained apparent improvement.Currently, researcher is still continuously improving its
Performance.
Practical Combustion Driven CW DF/HF chemical laser is exactly that will contain fluorine oxidiser and the mixed firinor fuel burning of hydrogeneous or deuterium fuel,
High temperature caused by burning makes oxidant decomposite F atom, and F atom quickly flows the D with jet pipe injection through supersonic speed2Or H2Reaction
The DF (v) or HF (v) for generating vibration excited state generate laser.
Laser is mainly made of 4 parts: combustion chamber, nozzle component, optical resonator and Pressure Recovery System.Burning
Room, also referred to as F atom generator, purposes are that pumping reaction for optical cavity provides enough F atoms.Jet pipe plays in the laser
Important role, it has significant effect the performance of laser.To guarantee that laser effectively operates, it is necessary to lasing substance be made to exist
Quickly through realized while optical cavity fuel with oxidant is effective and thorough mixes, therefore mixed performance is that Nozzle Design needs emphasis to examine
The factor of worry.Optical resonator abbreviation optical cavity is that the mixture reaction that jet pipe comes out generates the device of laser.Pressure Recovery System
Behind optical cavity, the supersonic speed from optical cavity, low-pressure air current are reverted to low speed, high pressure draught by it, with external air pressure
Matching.
In the past in order to which that improves HF/DF chemical laser goes out light energy, many researchers are in F atom generator, combustion chamber,
Many work are done in nozzle component design, since wherein reaction temperature, flow velocity, the several factors such as various mixing ratios can all influence
Gain number of particles is an extremely complex process, needs to grope by constantly testing.The present invention uses a kind of direct light
Method come increase chemical reaction after hydrogen fluoride product population inversion.
Summary of the invention
The present invention is using a branch of continuous wave infrared laser as induction optical coupling entering light chamber, by hydrogen fluoride chemical Laser System
In vibrational quantum number be v=1 specific rotation quantum state be induced on the rotation quantum state of vibration number v=0, with increase vibration
The population inversion between specific rotating state on quantum number v=2 in specific rotating state and vibrational quantum number v=1 is swashed with enhancing
Light output energy.
The device provided by the invention for increasing chemical laser population inversion includes: in the light path system of device
Tunable continuous wave light source 1, continuous wave induced laser 2, electrooptic modulator 3, reflection of polarization prism 4, a quarter
Wave plate 5, end mirror 6 after optical cavity, optical cavity 7, optical cavity outer wall 8, output coupling mirror 9, output light 10, closed-loop control system 11, photoelectricity are visited
Survey device 12, rear end mirror piezoelectric ceramics 13 and pressure recovery device interface 14；
Tunable continuous wave light source 1, electrooptic modulator 3, reflection of polarization prism 4, quarter-wave plate 5, rear end mirror piezoelectricity
Ceramics 13, end mirror 6 after optical cavity, optical cavity 7, output coupling mirror 9 are sequentially connected, and optical cavity outer wall 8 is enclosed in outside optical cavity 7；Photodetection
Device 12 connects reflection of polarization prism 4；Closed-loop control system 11 connects tunable continuous wave light source 1, electrooptic modulator 3, and photoelectricity is visited
Survey device 12；End mirror 6 and pressure recovery device interface 14 are on optical cavity outer wall 8 after optical cavity；
Tunable continuous wave light source 1 is that can generate the company of 2.6~4.0 μm of continuously adjustables within the scope of HF/DF chemical laser
Continuous wave laser, for the HF/DF molecule in lower vibration level to be induced to more low vibration energy level；Continuous wave induced laser 2
For the HF/DF molecule in lower vibration level to be induced to more low vibration energy level, its wavelength and the spontaneous radiation of HF molecule
Downward transition matches；Electrooptic modulator 3 is used for for changing the phase and frequency of continuous wave induced laser 2 by induced laser coupling
Close theory of evolution laser optical cavity 7；Reflection of polarization prism 4 can completely through P light fully reflective S light；Quarter-wave plate 5 is used for
Change the polarization of laser, the angle at 45 ° of continuous wave induced laser 2 of fast axle and linear polarization；End mirror 6 is plano-concave mirror, arc after optical cavity
Degree is able to satisfy realization stable cavity, to HF/DF chemical laser range (2.6~4.0 μm) high reflection (reflectivity > 99.9%)；Light
Chamber 7 is the stable cavity being made of end mirror 6 after optical cavity and output coupling mirror 9；Optical cavity outer wall 8 is cavity made of metal, upper end
Nozzle is connected, lower end connects pressure recovery device；Output coupling mirror 9 is plano-concave mirror, and radian is able to satisfy realization stable cavity, to HF/
DF chemical laser range (2.6~4.0 μm) high reflection (reflectivity > 99%), reflectivity are less than end mirror 6 after optical cavity；Output
Light 10 is the chemical laser finally exported by optical cavity；Closed-loop control system 11 is by signal generator, central computer, data acquisition
The system for blocking composition, with tunable continuous wave light source 1, electrooptic modulator 3, photodetector 12, rear 13 phase of end mirror piezoelectric ceramics
Connection；According to from the reflected light signal that photodetector 12 detects come the voltage on end mirror piezoelectric ceramics 13 after adjusting to change
The length of darkening chamber 7 is directly changed the output wavelength of tunable continuous wave light source 1 to make continuous wave induced laser 2 can be with coupling
Close entering light chamber 7；Photodetector 12 be to the photodetector that (2.6~4.0 μm) can respond within the scope of HF/DF chemical laser,
Light intensity signal is switched into voltage value；End mirror piezoelectric ceramics 13 is the device for loading end mirror 6 after optical cavity afterwards, can be according to input
Voltage changes length, to control the distance between end mirror 6 and output coupling mirror 9 after optical cavity to change the length of optical cavity 7；Pressure
Power recovery device interface 14 with pressure recovery device for being connected, the H that will have been used2, the extraction of the gases such as F, He；
The operating method of the device of the increase chemical laser population inversion, it is characterised in that: with a branch of continuous wave
Infrared laser is as induction optical coupling entering light chamber, by specific turn that the vibrational quantum number in hydrogen fluoride chemical Laser System is v=1
Dynamic quantum state is induced on the rotation quantum state of vibration number v=0, to increase specific rotating state and vibration on vibrational quantum number v=2
The population inversion between specific rotating state on quantum number v=1.
Tunable continuous wave light source 1: the company of (2.6~4.0 μm) continuously adjustable can be generated within the scope of HF/DF chemical laser
Continuous wave laser, for the HF/DF molecule in lower vibration level to be induced to more low vibration energy level；
Continuous wave induced laser 2: for the HF/DF molecule in lower vibration level to be induced to more low vibration energy level,
Its wavelength matches with the downward transition of HF molecule spontaneous radiation；
Electrooptic modulator 3: it is used to induced laser coupling evolution for changing the phase and frequency of continuous wave induced laser 2
Learn laser optical cavity 7；
Reflection of polarization prism 4: can completely through P light fully reflective S light；
Quarter-wave plate 5: for changing the polarization of laser, the continuous wave induced laser 2 of fast axle and linear polarization is at 45 °
Angle；
End mirror 6 after optical cavity: plano-concave mirror, radian are able to satisfy realization stable cavity, to HF/DF chemical laser range (2.6~4.0 μ
M) high reflection (reflectivity > 99.9%)；
Optical cavity 7: the stable cavity being made of end mirror 6 after optical cavity and output coupling mirror 9；
Optical cavity outer wall 8: cavity made of metal, upper end connect nozzle, and lower end connects pressure recovery device；
Output coupling mirror 9: plano-concave mirror, radian are able to satisfy realization stable cavity, to HF/DF chemical laser range (2.6~4.0 μ
M) high reflection (reflectivity > 99%), reflectivity are less than end mirror 6 after optical cavity；
Output light 10: the chemical laser finally exported by optical cavity；
Closed-loop control system 11: by signal generator, central computer, the system of the components such as data collecting card composition and can
Tuning continuous wave light source 1, electrooptic modulator 3, photodetector 12, rear end mirror piezoelectric ceramics 13 are connected.It is visited according to from photoelectricity
Survey the reflected light signal that detects of device 12 come the voltage on end mirror piezoelectric ceramics 13 after adjusting to change optical cavity 7 length or
The output wavelength of tunable continuous wave light source 1 is directly changed to allow continuous wave induced laser 2 to be coupled into optical cavity 7；
Photodetector 12: to the photodetector that (2.6~4.0 μm) can respond within the scope of HF/DF chemical laser, by light
Strong signal switchs to voltage value；
End mirror piezoelectric ceramics 13 afterwards: for loading the device of end mirror 6 after optical cavity, length can be changed according to input voltage
It is short, to control the distance between end mirror 6 and output coupling mirror 9 after optical cavity to change the length of optical cavity 7；
Pressure recovery device interface 14: for being connected with pressure recovery device, the H that will have been used2, the gases such as F, He pumping
Out；
The invention has the following advantages that
It is simple direct, go out striation independent of reaction temperature, flow velocity, each reaction gas mixing ratio and nozzle type etc.
Part directly expands the particle between the specific rotating state on vibrational quantum number v=2 in specific rotating state and vibrational quantum number v=1
Number reversion.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure；
Wherein, 1 tunable continuous wave light source, 2 continuous wave induced lasers, 3 electrooptic modulators, 4 reflection of polarization prisms, 5 four
/ mono- wave plate, end mirror after 6 optical cavities, 7 optical cavities, 8 optical cavity outer walls, 9 output coupling mirrors, output light 10, closed-loop control system 11,12
Photodetector, end mirror piezoelectric ceramics after 13,14 pressure recovery device interfaces；
Fig. 2 is the HF product particles population and radiation schematic diagram of HF chemical laser.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
Embodiment 1
Tunable continuous wave light source, electrooptic modulator, reflection of polarization prism, quarter-wave plate, rear end mirror piezoelectric ceramics,
End mirror after optical cavity, optical cavity, output coupling mirror are sequentially connected, and optical cavity outer wall is enclosed in outside optical cavity；Photodetector connection polarization is anti-
Penetrate prism；Closed-loop control system connects tunable continuous wave light source, electrooptic modulator, photodetector；End mirror and pressure after optical cavity
Power recovery device interface is on optical cavity outer wall.
Embodiment 2
HF product population when passing through optical cavity after the reaction of HF chemical laser combustion chamber is as shown in Fig. 2, HF product is most main
It is distributed on each rotation quantum state that vibrational quantum number is v=2, has on each rotation quantum state that vibrational quantum number is v=1
Less distribution, HF product are population partial inversions.The P of HF (v=1, j=5) is wherein arrived by HF (v=2, j=4)2(5)
Branch radiates (wavelength is about 2804nm) as the radiation of stronger chemical laser.
Method of the invention is exactly to be coupled into optical cavity 7 using a branch of continuous wave induced laser 2, its wavelength is exactly equal to
HF (v=1, j=5) arrives the P of HF (v=0, j=6)1(6) branch radiation (wavelength is about 2710nm).When HF product enters optical cavity,
Due to the effect by induction light 2, product in HF (v=1, j=5) state to HF (v=0, j=6) state transition and can enhance company
Continuous wave induced laser 2, and since the length of optical cavity 7 at this time just matches with induction light 2, induce light (P1(6) branch radiates) energy
Greatly enhanced, the product in HF (v=1, j=5) state can transit to downwards HF (v=0, j=6) state as snowslide；Finally
The population inversion caused between HF (v=2, j=4) and HF (v=1, j=5) expands, to can generate more in optical cavity 7
Strong chemical laser exports (P2(5) branch radiates).
By 2 (P of continuous wave induced laser1(6) branch radiates, and wavelength is about 2710nm) it is coupled into method used by optical cavity 7
There are two types of embodiment, (due to chemical laser since radiation line width caused by pressure and collision is wider (number GHz), while optical cavity is long
Degree is longer to cause optical cavity longitudinal mode spacing smaller (< 1GHz), so that can be effective as long as being coupled into optical cavity by continuous wave induced laser 2
Induce the downward transition of HF molecule):
1) scanning wavelength: first by the wavelength regulation of continuous wave induced laser 2 extremely by P1(6) branch radiation nearby (1GHz with
It is interior), then end mirror 6 reflects the input closed-loop control system 11 of signal caused by photodetector 12 after optical cavity, passes through closed loop
Control system is carried out feedback output and is allowed to and 7 phase of optical cavity to tunable continuous wave light source 1 to adjust the wavelength of continuous wave induced laser 2
It matches and is coupled into optical cavity；
2) scanning chamber is long: first by the wavelength regulation of continuous wave induced laser 2 extremely by P1(6) branch radiates corresponding accurate wave
It is long, then end mirror 6 reflects the input closed-loop control system 11 of signal caused by photodetector 12 after optical cavity, passes through closed loop control
System processed carrys out feedback output to rear end mirror piezoelectric ceramics 13 to adjust 7 length of optical cavity, is allowed to the wavelength with continuous wave induced laser 2
Match and is coupled into optical cavity.
Claims (2)
1. a kind of device for increasing chemical laser population inversion, it is characterised in that: include: in the light path system of device
Tunable continuous wave light source (1), continuous wave induced laser (2), electrooptic modulator (3), reflection of polarization prism (4), four points
One of wave plate (5), end mirror (6) after optical cavity, optical cavity (7), optical cavity outer wall (8), output coupling mirror (9), output light (10), closed loop control
System (11) processed, photodetector (12), rear end mirror piezoelectric ceramics (13) and pressure recovery device interface (14)；It is tunable continuous
Wave source (1), electrooptic modulator (3), reflection of polarization prism (4), quarter-wave plate (5), rear end mirror piezoelectric ceramics (13), light
Cavity rear end mirror (6), optical cavity (7), output coupling mirror (9) are sequentially connected, and optical cavity outer wall (8) is enclosed in optical cavity (7) outside；Photodetection
Device (12) connects reflection of polarization prism (4)；Closed-loop control system (11) connects tunable continuous wave light source (1), electrooptic modulator
(3), photodetector (12)；End mirror (6) and pressure recovery device interface (14) are on optical cavity outer wall (8) after optical cavity；
Tunable continuous wave light source (1) is the company that can generate within the scope of HF/DF chemical laser (2.6~4.0 μm) continuously adjustable
Continuous wave laser, for the HF/DF molecule in lower vibration level to be induced to more low vibration energy level；Continuous wave induced laser
(2) for the HF/DF molecule in lower vibration level to be induced to more low vibration energy level, its wavelength and the spontaneous spoke of HF molecule
Transition matches under directive；Electrooptic modulator (3) is used to induce for changing the phase and frequency of continuous wave induced laser (2)
Laser coupled theory of evolution laser optical cavity (7)；Reflection of polarization prism (4) can completely through P light fully reflective S light；Four/
Polarization of one wave plate (5) for changing laser, continuous wave induced laser (2) angle at 45 ° of fast axle and linear polarization；Optical cavity rear end
Mirror (6) is plano-concave mirror, and radian is able to satisfy realization stable cavity, (anti-to HF/DF chemical laser range (2.6~4.0 μm) high reflection
Penetrate rate > 99.9%)；Optical cavity (7) is the stable cavity being made of end mirror after optical cavity (6) and output coupling mirror (9)；Optical cavity outer wall (8)
For cavity made of metal, upper end connects nozzle, and lower end connects pressure recovery device；Output coupling mirror (9) is plano-concave mirror, arc
Degree is able to satisfy realization stable cavity, anti-to HF/DF chemical laser range (2.6~4.0 μm) high reflection (reflectivity > 99%)
Rate is penetrated less than end mirror (6) after optical cavity；Output light (10) is the chemical laser finally exported by optical cavity；Closed-loop control system (11) is
By signal generator, central computer, the system of data collecting card composition, with tunable continuous wave light source (1), electrooptic modulator
(3), photodetector (12), rear end mirror piezoelectric ceramics (13) are connected；According to the reflection detected from photodetector (12)
Optical signal is come the voltage on end mirror piezoelectric ceramics (13) after adjusting to change the length of optical cavity (7) or be directly changed tunable
The output wavelength of continuous wave light source (1) makes the continuous wave induced laser (2) can be coupled into optical cavity (7)；Photodetector (12)
For to the photodetector that (2.6~4.0 μm) can respond within the scope of HF/DF chemical laser, light intensity signal is switched to voltage value；Afterwards
End mirror piezoelectric ceramics (13) is the device for loading end mirror (6) after optical cavity, end mirror pressure after being changed according to input voltage
Electroceramics (13) length, to control the distance between end mirror after optical cavity (6) and output coupling mirror (9) to change optical cavity (7)
Length；Pressure recovery device interface (14) with pressure recovery device for being connected, the H that will have been used2, the gases such as F, He pumping
Out.
2. a kind of operating method of the device described in claim 1 for increasing chemical laser population inversion, it is characterised in that: use
Vibrational quantum number in hydrogen fluoride chemical Laser System is v as induction optical coupling entering light chamber by a branch of continuous wave infrared laser
=1 specific rotation quantum state is induced on the rotation quantum state of vibration number v=0, specific on vibrational quantum number v=2 to increase
The population inversion between specific rotating state in rotating state and vibrational quantum number v=1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510812304.2A CN106785879B (en) | 2015-11-20 | 2015-11-20 | A kind of device and its operating method increasing chemical laser population inversion |
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| CN201510812304.2A CN106785879B (en) | 2015-11-20 | 2015-11-20 | A kind of device and its operating method increasing chemical laser population inversion |
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| Publication Number | Publication Date |
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| CN106785879A CN106785879A (en) | 2017-05-31 |
| CN106785879B true CN106785879B (en) | 2018-12-25 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116448718B (en) * | 2023-04-19 | 2023-12-05 | 河北子曰机械设备有限公司 | Cavity ring-down tuning unit and cavity ring-down spectroscopy device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1016576A (en) * | 1962-08-22 | 1966-01-12 | Varian Associates | Optical maser |
| FR2668316A1 (en) * | 1977-04-29 | 1992-04-24 | Alsthom Cge Alcatel | Method and device for obtaining the laser effect by chemical means |
| CN103515837A (en) * | 2012-06-21 | 2014-01-15 | 中国科学院大连化学物理研究所 | Coherent adiabatic stimulated Raman excitation method for realizing population inversion |
-
2015
- 2015-11-20 CN CN201510812304.2A patent/CN106785879B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1016576A (en) * | 1962-08-22 | 1966-01-12 | Varian Associates | Optical maser |
| FR2668316A1 (en) * | 1977-04-29 | 1992-04-24 | Alsthom Cge Alcatel | Method and device for obtaining the laser effect by chemical means |
| CN103515837A (en) * | 2012-06-21 | 2014-01-15 | 中国科学院大连化学物理研究所 | Coherent adiabatic stimulated Raman excitation method for realizing population inversion |
Non-Patent Citations (1)
| Title |
|---|
| Numerical study of base effects on population inversion in DF chemical laser cavity;Jun Sung Park et al.;《International Journal of Heat and Mass Transfer》;20060609;第49卷;第4043-4057页 * |
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