CN114204386A - Raising transverse excitation atmospheric pressure CO2Device and method for laser repetition frequency - Google Patents
Raising transverse excitation atmospheric pressure CO2Device and method for laser repetition frequency Download PDFInfo
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- CN114204386A CN114204386A CN202010991487.XA CN202010991487A CN114204386A CN 114204386 A CN114204386 A CN 114204386A CN 202010991487 A CN202010991487 A CN 202010991487A CN 114204386 A CN114204386 A CN 114204386A
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- 230000010355 oscillation Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 27
- 238000004140 cleaning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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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
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/038—Electrodes, e.g. special shape, configuration or composition
- H01S3/0385—Shape
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
- H01S3/0835—Gas ring lasers
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/097—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser
- H01S3/0971—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser transversely excited
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
CO improving transverse excitation atmospheric pressure2The device comprises a cavity which is a hollow structure and plays a role in vacuum container and support protection of working gas; the annular discharge unit array is arranged in the cavity and comprises a plurality of discharge units, and each discharge unit comprises a pair of discharge electrodes; the tail mirror is arranged on the axis of each pair of discharge electrode discharge areas and used as a reflecting mirror; the rotatable corner reflector is arranged on one side of the outer part of the cavity, which is far away from the tail mirror; and the output mirror is arranged on the axis of the cavity in the cavity and forms a resonant cavity with the tail mirror and the corner mirror. The invention mainly lies in that a rotating angle reflecting mirror and an annular part are utilizedThe electrode array of the cloth forms a turning resonant cavity rotating at high speed, and the rapid 'replacement' of gas in a discharge area is realized by the rapid switching of the electrodes, so that TEACO is realized2Laser high repetition rate output.
Description
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a method for improving transverse excitation atmospheric pressure CO2An apparatus and method for laser repetition frequency.
Background
Transverse excitation of atmospheric CO2Laser, also known as TEA (Transverselly exposed Atmospheric) CO2The laser is excited by pulse discharge, has an output wave band of 9-11 μm, has good atmospheric transmission performance and high pulse peak power (MW level), and is widely applied to the fields of laser processing, spectrum detection, photoelectric countermeasure and the like. With the further development requirements in various fields and diversification of application occasions in recent years, TEACO is improved2The repetition frequency of the laser has become a technical problem to be solved.
TEA CO2The laser generates adverse conditions such as gas decomposition and impurity gases during each discharge, and requires a short recovery time. The replacement (or cleaning) of the gas in the discharge area must be completed before the next discharge starts, otherwise the stability of the discharge at the next time is greatly reduced, and the arcing is caused.
Under the condition of no active gas circulation, the plasma impact effect and natural diffusion effect generated by laser pulse discharge have certain cleaning effect on gas between electrodes, but the achievable repetition frequency is limited and is generally less than 5 Hz. Under the condition of adding active gas circulation, if the traditional scheme forces gas to reach a certain flow rate by means of a fan and the like, higher repetition frequency work can be realized, but the technical bottleneck exists in the process of increasing repetition frequency due to a series of reasons of increasing the square relation of wind resistance along with the increase of the gas flow rate, limiting the power of a fan device, limiting the system weight and the like.
Disclosure of Invention
In view of the above, one of the main objectives of the present invention is to provide a method for increasing the transverse excitation atmospheric pressure CO2An apparatus and method for laser repetition frequency at least partially solve at least one of the above technical problems.
To achieve the above object, as one aspect of the present invention, there is provided a method of increasing transverse excitation atmospheric pressure CO2An apparatus for laser repetition frequency comprising:
the cavity is of a hollow structure and plays a role in supporting and protecting;
the annular discharge unit array is arranged in the cavity and comprises a plurality of discharge units, and each discharge unit comprises a pair of discharge electrodes;
the tail mirror is arranged on the axis of each pair of discharge electrode discharge areas and used as a reflecting mirror;
the rotatable corner reflector is arranged on one side of the outer part of the cavity, which is far away from the tail mirror; and
and the output mirror is arranged on the axis of the cavity in the cavity and forms a resonant cavity with the tail mirror and the corner mirror.
As another aspect of the invention, there is also provided a method of increasing transverse excitation atmospheric pressure CO2A method of laser repetition frequency, using an apparatus as described above, comprising:
controlling the angle reflecting mirror to rotate in the same direction, when the angle reflecting mirror rotates to the axis position of the first pair of electrodes, forming a resonant cavity by the tail mirror on the axis of the pair of electrodes and the output mirror through the angle reflecting mirror, controlling the pulse discharge starting moment to control the working gas in the pumping discharge area to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity and outputting the laser from the output mirror;
controlling the angle reflectors to continuously rotate in the same direction to reach the axis positions of the next pair of electrodes, enabling the tail reflectors on the axes of the corresponding electrodes to form a resonant cavity with the output mirror through the angle reflectors, controlling the pulse discharge starting time, enabling the working gas in the pump discharge region to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity, and outputting the laser from the output mirror;
by analogy, different electrode pairs are sequentially discharged to generate laser output by rotating the angle reflecting mirror, so that transverse excitation of atmospheric pressure CO is realized2The laser implements a repetition rate output.
Based on the technical scheme, the invention can improve the transverse excitation atmospheric pressure CO2The apparatus and method for laser repetition frequency has at least one of the following advantages over the prior art:
1. the invention mainly lies in that the rotating angle reflector and the annularly distributed electricity are utilizedThe electrode array forms a turning type resonant cavity rotating at high speed, and the rapid 'replacement' of gas in a discharge area is realized by the rapid switching of electrodes, thereby realizing TEA CO2Laser high repetition frequency output;
2. the invention realizes the high-magnification of the single-cavity low-repetition-frequency work under the condition of no active gas circulation, can increase the repetition frequency to hundreds of Hz by increasing the number of the electrode pairs (more than 20 pairs) in the array, and can be suitable for gas environments with low flow rate, high density and the like, such as high-pressure pulse CO2A laser;
3. the invention realizes the multiplication of the repetition frequency of the laser under the condition of active gas circulation, and removes the limit of wind resistance on the repetition frequency of the laser in the traditional method of forcing gas to flow;
4. the invention can effectively relieve or avoid the problems of huge gas circulation device, increased power consumption and the like required in the traditional means for improving the repetition frequency.
Drawings
FIG. 1 is a schematic representation of an embodiment of the invention for increasing transverse excitation atmospheric pressure CO2The structure diagram of the output device of the laser repetition frequency;
FIG. 2 is a schematic cross-sectional view of a ring electrode array in an embodiment of the invention.
Description of reference numerals:
1-discharge unit, 2-tail mirror, 3-corner mirror, 4-output mirror, 5-cavity.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention discloses a method for improving transverse excitation atmospheric pressure CO2An apparatus for laser repetition frequency comprising:
the cavity is of a hollow structure and is used as a working gas vacuum container and plays a role in supporting and protecting;
the annular discharge unit array is arranged in the cavity and comprises a plurality of discharge units, and each discharge unit comprises a pair of discharge electrodes;
the tail mirror is arranged on the axis of each pair of discharge electrode discharge areas and used as a reflecting mirror;
the rotatable corner reflector is arranged on one side of the outer part of the cavity, which is far away from the tail mirror; and
and the output mirror is arranged on the axis of the cavity in the cavity and forms a resonant cavity with the tail mirror and the corner mirror.
In some embodiments of the invention, the output mirror end and corner mirrors form a turning resonator.
In some embodiments of the invention, the end mirrors form an array of ring-shaped end mirrors.
The invention also discloses a method for improving transverse excitation atmospheric pressure CO2A method of laser repetition frequency, using an apparatus as described above, comprising:
controlling the angle reflecting mirror to rotate in the same direction, when the angle reflecting mirror rotates to the axis position of the first pair of electrodes, forming a resonant cavity by the tail mirror on the axis of the pair of electrodes and the output mirror through the angle reflecting mirror, controlling the pulse discharge starting moment to control the working gas in the pumping discharge area to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity and outputting the laser from the output mirror;
controlling the angle reflectors to continuously rotate in the same direction to reach the axis positions of the next pair of electrodes, enabling the tail reflectors on the axes of the corresponding electrodes to form a resonant cavity with the output mirror through the angle reflectors, controlling the pulse discharge starting time, enabling the working gas in the pump discharge region to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity, and outputting the laser from the output mirror;
by analogy, different electrode pairs are sequentially discharged to generate laser output by rotating the angle reflecting mirror, so that transverse excitation of atmospheric pressure CO is realized2The laser implements a repetition rate output.
In some embodiments of the present invention, the repetition frequency has a value equal to the number of electrode pairs that the corner mirror passes through and operates in discharge per unit time.
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
In the embodiment, the TEA CO is improved by adopting the annular electrode array and the U-shaped rotating resonant cavity formed by turning the light path by utilizing the corner reflector2The laser repetition frequency method adopts a device shown in fig. 1, a circular discharge unit array layout (a cross section schematic diagram is shown in fig. 2) is adopted in a cavity 5, and a tail mirror 2 is correspondingly installed on the axis of each pair of electrode discharge areas of the discharge unit 1, so that a circular tail mirror array is also formed. An output mirror 4 is arranged on the axis of the cylindrical cavity body. And a corner reflector 3 which can precisely rotate at high speed around the axis of the cavity is arranged at the outer side of the other end of the cavity 5. The corner reflector 3 is driven by a high-speed motor, an arrow A in figures 1-2 is the rotation direction of the corner reflector, when the corner reflector rotates to a specific angle, the axis of a cylinder is connected with the central axis of an electrode discharge area in a U shape through reflection, an output mirror 4, the corner reflector 3 and a tail mirror 2 form a resonant cavity, the laser path of the U-shaped turning resonant cavity is shown as a light path B in figure 1, at the moment, a discharge unit 1 triggers discharge, and laser passes through the corner reflector 3 and then is output along the axis of the cylinder.
The annular discharge unit array is used for pulse discharge pumping working gas to generate population inversion; the tail mirror is used as a reflector in a two-sided cavity mirror which is necessary for the resonant cavity; the corner reflector selects different corresponding electrode pairs at different angles, deflects the optical axis at the axis position of a certain pair of electrode discharge regions, and enables the tail mirror and the output mirror to be connected into a resonant cavity through light path deflection.
Using the apparatus shown in FIG. 1, TEA CO was raised2The laser repetition frequency method comprises the following steps:
the angle reflecting mirror is controlled to rotate in the same direction, when the angle reflecting mirror rotates to the position of the axis of the first pair of electrodes, the tail mirror on the axis of the pair of electrodes forms a U-shaped resonant cavity with the output mirror through the corner reflecting mirror turn, at the moment, the maximum population inversion is generated in the working gas in the pumping discharge area through accurately controlling the pulse discharge starting moment, and laser is formed and output from the output mirror after oscillation and amplification of the resonant cavity.
And controlling the angle reflecting mirror to continuously rotate in the same direction to reach the axis position of the next pair of electrodes, and enabling the tail mirror on the axis of the corresponding electrode to form a resonant cavity with the output mirror through the turning of the angle reflecting mirror, wherein at the moment, the maximum population inversion is generated in the working gas in the pumping discharge area through accurately controlling the pulse discharge starting moment, and the laser is formed and output from the output mirror after being oscillated and amplified by the resonant cavity.
By analogy, through rapidly rotating the angle reflecting mirror, different electrode pairs are sequentially discharged to generate laser output, and TEA CO can be realized2The laser achieves high repetition rate output. The number of repetition frequencies is equal to the number of electrode pairs that the corner mirror passes and operates in discharge per unit time.
Specifically, assuming that there are n pairs of electrodes in the electrode array, after the corner mirror 3 rotates to reach the designated position P1 in the axial direction of the first pair of electrodes, the end mirror on the axial direction of the pair of electrodes forms a first U-shaped resonant cavity (not limited to the U-shaped resonant cavity) with the output mirror through the turning of the corner mirror, and at this time, the laser triggers discharge and emits light. And then the corner reflector continues to rotate and accurately reaches the designated positions P2, P3,. Pn in the axial direction of other electrodes to form 2 nd, 3 rd and n th resonant cavities, and the triggering discharge and light emission are sequentially completed until the corner reflector rotates once to return to P1, which is 1 complete cycle.
In the structure, under the condition that no active gas circulation exists between the electrodes, the gas of a single pair of electrodes completes passive cleaning due to the diffusion effect of pulse discharge, and j Hertz (Hz) low-repetition-frequency work is realized (generally j is less than or equal to 5). When the corner reflector completes j complete cycles in a period of 1s (namely the corner reflector is controlled to rotate for j circles), n pairs of electrodes are triggered to discharge in turn in each cycle, and the repetition frequency of the whole laser can be increased to n multiplied by j hertz (Hz).
In the structure, under the condition that active gas circulation is added between the electrodes, the gas of a single pair of electrodes completes active cleaning by virtue of gas flow, and the high repetition frequency work (generally dozens to hundreds of hertz) of m hertz (Hz) can be realized. When the corner reflector completes m complete cycles in a period of 1s (namely the corner reflector is controlled to rotate for m circles), n pairs of electrodes are triggered to discharge in turn in each cycle, and the repetition frequency of the whole laser can be increased to m multiplied by n hertz (Hz). I.e. an increase of n times.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. CO improving transverse excitation atmospheric pressure2An apparatus for laser repetition frequency comprising:
the cavity is of a hollow structure;
the annular discharge unit array is arranged in the cavity and comprises a plurality of discharge units, and each discharge unit comprises a pair of discharge electrodes;
the tail mirror is arranged on the axis of each pair of discharge electrode discharge areas and used as a reflecting mirror;
the rotatable corner reflector is arranged on one side of the outer part of the cavity, which is far away from the tail mirror; and
and the output mirror is arranged on the axis of the cavity in the cavity and forms a resonant cavity with the tail mirror and the corner mirror.
2. The apparatus of claim 1,
the tail mirror and the corner mirror of the output mirror form a turning resonant cavity.
3. The apparatus of claim 1,
the end mirrors form an annular array of end mirrors.
4. CO improving transverse excitation atmospheric pressure2A method of laser repetition frequency, using an apparatus as claimed in any one of claims 1 to 3, comprising:
controlling the angle reflecting mirror to rotate in the same direction, when the angle reflecting mirror rotates to the axis position of the first pair of electrodes, forming a resonant cavity by the tail mirror on the axis of the pair of electrodes and the output mirror through the angle reflecting mirror, controlling the pulse discharge starting moment to control the working gas in the pumping discharge area to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity and outputting the laser from the output mirror;
controlling the angle reflectors to continuously rotate in the same direction to reach the axis positions of the next pair of electrodes, enabling the tail reflectors on the axes of the corresponding electrodes to form a resonant cavity with the output mirror through the angle reflectors, controlling the pulse discharge starting time, enabling the working gas in the pump discharge region to generate maximum population inversion, forming laser after oscillation and amplification of the resonant cavity, and outputting the laser from the output mirror;
by analogy, different electrode pairs are sequentially discharged to generate laser output by rotating the angle reflecting mirror, so that transverse excitation of atmospheric pressure CO is realized2The laser implements a repetition rate output.
5. The method of claim 4,
the number of the repetition frequency is equal to the number of the electrode pairs which pass through the corner reflector in unit time and are in discharge operation.
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| CN202010991487.XA CN114204386B (en) | 2020-09-18 | 2020-09-18 | Increasing transverse excitation atmospheric pressure CO 2 Device and method for laser repetition frequency |
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| CN202010991487.XA CN114204386B (en) | 2020-09-18 | 2020-09-18 | Increasing transverse excitation atmospheric pressure CO 2 Device and method for laser repetition frequency |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3766466A (en) * | 1971-11-26 | 1973-10-16 | Us Navy | Device for simultaneously q-switching several independent ruby lasers |
| US4660204A (en) * | 1984-08-02 | 1987-04-21 | Hughes Aircraft Company | CO2 TEA laser utilizing an intra-cavity prism Q-switch |
| JP2000269569A (en) * | 1999-03-19 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Discharge excitation gas laser device |
| KR20120057249A (en) * | 2010-11-26 | 2012-06-05 | 국방과학연구소 | Wavelength-selection device having optical alignment stability with use of prisms in a dual-wavelength laser |
| CN103036132A (en) * | 2012-12-12 | 2013-04-10 | 中国科学院长春光学精密机械与物理研究所 | Laser head device with multiple groups of discharge gain units circumferentially distributed |
| CN107453199A (en) * | 2017-07-31 | 2017-12-08 | 中国科学院长春光学精密机械与物理研究所 | A kind of repetition rate giant-pulse gas laser laser head |
-
2020
- 2020-09-18 CN CN202010991487.XA patent/CN114204386B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3766466A (en) * | 1971-11-26 | 1973-10-16 | Us Navy | Device for simultaneously q-switching several independent ruby lasers |
| US4660204A (en) * | 1984-08-02 | 1987-04-21 | Hughes Aircraft Company | CO2 TEA laser utilizing an intra-cavity prism Q-switch |
| JP2000269569A (en) * | 1999-03-19 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Discharge excitation gas laser device |
| KR20120057249A (en) * | 2010-11-26 | 2012-06-05 | 국방과학연구소 | Wavelength-selection device having optical alignment stability with use of prisms in a dual-wavelength laser |
| CN103036132A (en) * | 2012-12-12 | 2013-04-10 | 中国科学院长春光学精密机械与物理研究所 | Laser head device with multiple groups of discharge gain units circumferentially distributed |
| CN107453199A (en) * | 2017-07-31 | 2017-12-08 | 中国科学院长春光学精密机械与物理研究所 | A kind of repetition rate giant-pulse gas laser laser head |
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