CN103490285A - High-efficiency long-service-life discharge triggering non-chained pulse DF laser device combined electrode - Google Patents
High-efficiency long-service-life discharge triggering non-chained pulse DF laser device combined electrode Download PDFInfo
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- CN103490285A CN103490285A CN201310384600.8A CN201310384600A CN103490285A CN 103490285 A CN103490285 A CN 103490285A CN 201310384600 A CN201310384600 A CN 201310384600A CN 103490285 A CN103490285 A CN 103490285A
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Abstract
The invention provides a high-efficiency long-service-life discharge triggering non-chained pulse DF laser device combined electrode and belongs to the technical field of laser. The technical problems that in an existing small-size small-diameter non-chained pulse DF laser device discharge triggering technology, discharge between electrodes is not even and stable, and service life of the electrodes is short are solved. The combined electrode comprises an insulation base, a self-triggering electrode composed of a main discharge cathode and a main discharge anode, and a preionization electrode composed of a fixed spark needle array, a mobile spark needle array and a tungsten rod array. The fixed spark needle array and the tungsten rod array are both fixed on the insulation base and are symmetrical relative to the self-triggering electrode. A mobile spark needle is arranged at the top end of each tungsten rod. The distance between the needle tip of each fixed spark needle and the needle tip of each mobile spark needle can be adjusted by rotating each mobile spark needle. The combined electrode is even and stable in discharge and long in service life.
Description
Technical field
The invention provides a kind of high efficiency long service electric discharge and cause non-chain pulsed DF laser combination electrode, belong to laser technology field.
Background technology
Non-chain pulsed DF laser is one of important mid-infrared light source, is widely used in the fields such as laser radar, atmosphere ecological monitoring, spectroscopy.Non-chain pulsed DF laser is to cause the non-chain type heat-producing chemical reaction of working gas under the external source effect, reacts the energy discharged and impels the population inversion of upper and lower energy inter-stage and form sharp lase.For the initiating method of this chemical reaction, flash photolysis causes in commonly used having, electron beam causes and electric discharge causes three kinds.Flash photolysis causes and can realize small-bore, optically thin non-chain pulsed DF Laser output, but due to the photoflash lamp burst length much larger than the laser pulse time, so its efficiency is lower; The electron beam initiating device is bulky, complex structure, expensive and be subject to the initiating device process technology limit, and the Laser output energy is not high, so it is applied and is restricted; The electric discharge initiation method is simple in structure, easy to operate and can obtain higher-wattage and efficiency, is current non-chain pulsed DF laser initiating method comparatively commonly used.
The electric discharge initiation method generally adopted both at home and abroad is spark pin ultraviolet pre-ionization electrode, the symmetrical spark pin array of placing in the plate electrode one or both sides that this electrode structure is placed in symmetry, produce extremely strong ultraviolet light irradiation by arc discharge between the spark pin, working media is subject to the ultraviolet light irradiation effect to produce certain density initiating electron, then causes main discharge.Yet because the working media of non-chain pulsed DF laser is mainly the SF with strong electronegativity
6gas, it has very strong suction-operated to electronics, and this initiating electron that will cause preionization to produce loses in a large number.In order to promote the preionization effect, must improve charging voltage, but higher charging voltage can increase the electric field inhomogeneities, and there is marginal effect of electric field in this electrode, easily cause arc discharge, thereby spark pin ultraviolet pre-ionization electrode Uniform discharge, less stable.
Apollonov has mentioned a kind of from causing discharging structure in paper Self-initiated volume discharge in non-chain HF lasers based on SF6-hydrocarbon mixtures (QuantumElectronics30 (3) 207-214) in 2000, it adopts common plate electrode, and just the salient point that blasting treatment forms the 50 μ m scales that are evenly distributed is carried out on the target surface.Due to salient point place electric field grow, easily form discharge channel, SF simultaneously between they and anode surface
6the current density restrictions that causes of strong electronegativity the energy in the storage capacitor inject gain region from limited discharge channel, impelled discharge channel to the last Uniform Discharge that spreads all over whole cathode surface that forms of expansion around it.Facts have proved that the kind electrode structure can be at large volume, heavy caliber (electrode surface area S>300cm
2, electrode spacing d>8-10cm) realize the high efficiency Laser output in non-chain pulsed DF laser, but cause non-chain pulsed DF laser for small size, small-bore electric discharge, due to the partial discharge passage on the vertical electric field direction near the spreading rate of passage slower, cause internal field strong and cause discharge instability between electrode, finally cause that gas breakdown voltage is low, the pulse energy poor repeatability.
In addition, sparking electrode material commonly used is the common stainless steel material, its corrosion resistance is poor, but not chain type DF laser works aerochemistry reaction generate in product fluoridize deuterium (sour gas), subfluoride has stronger corrosivity, thereby the electrode life of common stainless steel material is shorter.
Summary of the invention
The present invention seeks to solve in existing small size, small-bore non-chain pulsed DF laser electric discharge elicitation technique inhomogeneous the stablizing of discharging between electrode, the technical problem that electrode life is short, provide a kind of high efficiency long service electric discharge to cause non-chain pulsed DF laser combination electrode.
High efficiency long service electric discharge of the present invention causes non-chain pulsed DF laser combination electrode and comprises:
Main discharge negative electrode, main discharge anode, insulator foot, fixedly spark pin array, mobile spark pin array and tungsten bar array;
Described main discharge negative electrode and main discharge anode form from causing electrode, on described main discharge negative electrode, the bump structure be evenly distributed are arranged;
Described fixedly spark pin array, mobile spark pin array and tungsten bar array form pre-ionization electrode, fixedly spark pin array and tungsten bar array evenly are fixed on insulator foot, and fixedly spark pin array and tungsten bar array are with respect to certainly causing the electrode symmetry, the top of each tungsten bar is equipped with a mobile spark pin, can regulate the distance between the needle point of the needle point of fixing spark pin and mobile spark pin by spark pin in rotary moving.
Further, the method preparation that described bump structure adopts surface sand-blasting to process, scale is 40-60 μ m.
Further, the material of described main discharge negative electrode and main discharge anode is monel metal.
Further, described mobile spark pin is arranged on the top to its passive tungsten bar by screwed hole.
Further, described insulator foot is polyvinyl chloride (PVC) insulator foot.
The invention has the beneficial effects as follows:
(1) what combination electrode of the present invention adopted that spark pin ultraviolet pre-ionization electrode and negative electrode do blasting treatment causes the composite construction that electrode combines certainly, spark pin ultraviolet pre-ionization electrode is by fixing spark pin array, mobile spark pin array and tungsten bar array form, adopt fixedly spark pin array on one side main discharge electrode, the mobile spark pin array that adopts the tungsten bar array to support on the opposite side main discharge electrode, fixedly the bottom of spark pin and tungsten bar is respectively with separate, equal-sized preionization electric capacity is connected, according to working gas pressure size to mobile spark pin and fixedly the needle point distance of spark pin regulated, to choose suitable preionization concentration, it is the required puncture voltage of low pressure, preionization concentration is lower, should increase the preionization pin spacing, the required puncture voltage of hyperbar and preionization concentration are higher, should reduce the preionization pin spacing, can make like this combination electrode reach best ultraviolet preionization effect, the ultraviolet light irradiation produced has increased region of discharge initiating electron concentration, reduced the gas impedance, thereby improved from causing the spreading rate of discharge channel on the vertical electric field direction, increased Uniform discharge and and stability,
Main discharge electrode is for certainly causing electrode, the main discharge negative electrode is that surface forms the equally distributed coarse structure of 40-60 μ m scale salient point through blasting treatment, when at the main discharge electrode two ends, adding high pressure, cathode surface salient point electric field is stronger, thereby be easy to form discharge channel with anode surface, avoided the electric discharge inhomogeneities that in small size ultraviolet preionized discharge electrode, marginal effect of electric field causes, and main discharge electrode adopts monel metal, compare with common stainless steel and there is stronger corrosion resistance, can significant prolongation electrode working life;
(2) combined electrode structure of the present invention is simple, is easy to manufacture and install, and is applied to can improve energy injection efficiency in laser, and then improves the laser output performance.
The accompanying drawing explanation
Fig. 1 is that high efficiency long service electric discharge of the present invention causes non-chain pulsed DF laser combined electrode structure schematic diagram.
In figure: 1, main discharge negative electrode, 2, the main discharge anode, 3, insulator foot, 4, fixing spark pin, 5, mobile spark pin, 6, the tungsten bar, 7, electrode fixing holes, 8, fixing counter sink.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, high efficiency long service of the present invention electric discharge causes non-chain pulsed DF laser combination electrode, comprises main discharge negative electrode 1, main discharge anode 2, PVC insulator foot 3, fixedly spark pin array, mobile spark pin array, tungsten bar array, electrode fixing holes 7 and fixing counter sink 8;
Wherein, main discharge negative electrode 1 and main discharge anode 2 form from causing electrode, main discharge negative electrode 1 all adopts the corrosion resistance monel metal with main discharge anode 2, and main discharge negative electrode 1 surface becomes small scale (40-60 μ m) the equally distributed coarse structure of salient point through blasting treatment;
Fixing spark pin array, mobile spark pin array and tungsten bar array form pre-ionization electrode, fixedly spark pin array and tungsten bar array evenly are fixedly mounted on PVC insulator foot 3 by tight screwed hole, and fixedly spark pin array and tungsten bar array are symmetrical one by one with respect to certainly causing electrode, can be that fixedly spark pin array is fixed on the PVC insulator foot 3 of dress main discharge negative electrode 1, the tungsten bar array is fixed on the PVC insulator foot 3 of dress main discharge anode 2, can be also that fixedly spark pin array is fixed on the PVC insulator foot 3 of dress main discharge anode 2, the tungsten bar array is fixed on the PVC insulator foot 3 of dress main discharge negative electrode 1, and fixedly spark pin array and tungsten bar array can be fixed on from a side or the both sides of causing electrode simultaneously, according to from cause electrode length and with an array spark pin between the distance can determine the spark pin quantity be arranged on PVC insulator foot 3,
Fixedly spark pin array is comprised of the fixedly spark pin 4 of evenly arranging, mobile spark pin array is comprised of the mobile spark pin 5 of evenly arranging, the tungsten bar array is comprised of the tungsten bar 6 of evenly arranging, fixedly the spark pin 4, the quantity of mobile spark pin 5 and tungsten bar 6 is all identical, the top of each tungsten bar 6 is equipped with a mobile spark pin 5, each moves spark pin 5 and be shape of threads except tip portion and end portion, and thread size and the precision threaded hole on its passive tungsten bar 6 is complementary, can regulate the distance between the needle point of the needle point of fixing spark pin 4 and mobile spark pin 5 by spark pin 5 in rotary moving, for fear of tungsten bar 6 tops and the fixedly point discharge between spark pin 5, rounding off and the larger structure of radius of curvature are processed into in tungsten bar 6 tops,
Main discharge negative electrode 1 and main discharge anode 2 center, back side processing two row's electrode fixing holes 7, use the good copper screw of electric conductivity that main discharge negative electrode 1 and main discharge anode 2 are fixedly mounted on PVC insulator foot 3 by electrode fixing holes 7, PVC insulator foot 3 two ends direction processing one row parallel with the tungsten bar array with fixing spark pin array be counter sink 8 fixedly, by screw, PVC insulator foot 3 is fixed on electrode holder.
For the non-chain pulsed DF of middle small size laser (electrode surface area S≤300cm
2, electrode spacing d≤8cm), just can regulate preionization intensity and carry out pre-arcing by regulating fixedly the distance of the needle point between spark pin 4 and mobile spark pin 5, the UV-irradiation cathode surface that preionization produces, accelerated the diffusion rate of discharge channel on the vertical electric field direction between main electrode, increase field uniformity, improved efficiency of laser and output performance.
Obviously, the explanation of above execution mode is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that the those of ordinary skill for described technical field, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection range of the claims in the present invention.
Claims (5)
1. the high efficiency long service electric discharge causes non-chain pulsed DF laser combination electrode, it is characterized in that, comprising:
Main discharge negative electrode (1), main discharge anode (2), insulator foot (3), fixedly spark pin array, mobile spark pin array and tungsten bar array;
Described main discharge negative electrode (1) and main discharge anode (2) form from causing electrode, and the main discharge negative electrode has the bump structure be evenly distributed on (1);
Described fixedly spark pin array, mobile spark pin array and tungsten bar array form pre-ionization electrode, fixedly spark pin array and tungsten bar array evenly are fixed on insulator foot (3), and fixedly spark pin array and tungsten bar array are with respect to certainly causing the electrode symmetry, the top of each tungsten bar (6) is equipped with a mobile spark pin (5), can regulate the distance between the needle point of the needle point of fixing spark pin (4) and mobile spark pin (5) by spark pin in rotary moving (5).
2. the high efficiency long service electric discharge causes non-chain pulsed DF laser combination electrode according to claim 1, it is characterized in that, and the method preparation that described bump structure adopts surface sand-blasting to process, scale is 40-60 μ m.
3. the high efficiency long service electric discharge causes non-chain pulsed DF laser combination electrode according to claim 1, it is characterized in that, the material of described main discharge negative electrode (1) and main discharge anode (2) is monel metal.
4. the high efficiency long service electric discharge causes non-chain pulsed DF laser combination electrode according to claim 1, it is characterized in that, described mobile spark pin (5) is arranged on the top to its passive tungsten bar (6) by screwed hole.
5. the high efficiency long service electric discharge causes non-chain pulsed DF laser combination electrode according to claim 1, it is characterized in that, described insulator foot (3) is the polyvinyl chloride insulation base.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915752A (en) * | 2014-03-26 | 2014-07-09 | 中国科学院长春光学精密机械与物理研究所 | Laser efficient pulse discharge system |
| CN108767660A (en) * | 2018-05-23 | 2018-11-06 | 西北核技术研究所 | A kind of micro groove structure cathode gas spark switch |
| CN108923230A (en) * | 2018-07-18 | 2018-11-30 | 中山普宏光电科技有限公司 | A kind of dielectric impedance spark preionization discharge electrode |
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| CN101540467A (en) * | 2009-05-05 | 2009-09-23 | 中国科学院长春光学精密机械与物理研究所 | Laser discharge chamber device of gas CO2 laser |
| CN102904162A (en) * | 2012-10-22 | 2013-01-30 | 云南电力试验研究院（集团）有限公司电力研究院 | Multichannel gas spark switch based on ultraviolet preionization technology |
| FR2984027A1 (en) * | 2011-12-09 | 2013-06-14 | Commissariat Energie Atomique | High voltage spark gap device i.e. laser initiated spark gap device, for transferring energy to active component, has cathode connected to terminal through additional resistor whose resistive value satisfies specific relation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101540467A (en) * | 2009-05-05 | 2009-09-23 | 中国科学院长春光学精密机械与物理研究所 | Laser discharge chamber device of gas CO2 laser |
| FR2984027A1 (en) * | 2011-12-09 | 2013-06-14 | Commissariat Energie Atomique | High voltage spark gap device i.e. laser initiated spark gap device, for transferring energy to active component, has cathode connected to terminal through additional resistor whose resistive value satisfies specific relation |
| CN102904162A (en) * | 2012-10-22 | 2013-01-30 | 云南电力试验研究院（集团）有限公司电力研究院 | Multichannel gas spark switch based on ultraviolet preionization technology |
Non-Patent Citations (2)
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| 柯常军等: ""非链式脉冲HF/DF激光的新型引发技术"", 《激光技术》, vol. 32, no. 2, 30 April 2008 (2008-04-30), pages 1 - 3 * |
| 柯常军等: "放电引发非链式脉冲HF/DF激光器的研究进展", 《激光与红外》, vol. 33, no. 4, 31 August 2003 (2003-08-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915752A (en) * | 2014-03-26 | 2014-07-09 | 中国科学院长春光学精密机械与物理研究所 | Laser efficient pulse discharge system |
| CN108767660A (en) * | 2018-05-23 | 2018-11-06 | 西北核技术研究所 | A kind of micro groove structure cathode gas spark switch |
| CN108923230A (en) * | 2018-07-18 | 2018-11-30 | 中山普宏光电科技有限公司 | A kind of dielectric impedance spark preionization discharge electrode |
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