CN1328365A - Method for building axial-flow CO laser and its device - Google Patents
Method for building axial-flow CO laser and its device Download PDFInfo
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- CN1328365A CN1328365A CN 00113014 CN00113014A CN1328365A CN 1328365 A CN1328365 A CN 1328365A CN 00113014 CN00113014 CN 00113014 CN 00113014 A CN00113014 A CN 00113014A CN 1328365 A CN1328365 A CN 1328365A
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Abstract
A method for preparing the axial-flow CO laser and its device is disclosed. The by-pass tube in liquid nitrogen tank, discharge tube, gas reservoir and gas outlet tube at anode are made up of quartz material. The liquid nitrogen tank, flow divider, collector and connecting tube are made up of stainless steel. A natural vacuum sealing technique. is used for sealing the end port of quartz tubes and metal tubes. Its advantages are excellent discharge performance, high heat exchange property, good vacuum sealing and low cost.
Description
The present invention relates to the manufacturing technology of laser, particularly relate to the improvement of the construction method and the device thereof of axial-flow CO laser in the high-power CO (carbon monoxide converter) laser.
High-power CO (carbon monoxide converter) laser commonly used is divided into two kinds of crossing current CO (carbon monoxide converter) laser and axial-flow CO lasers.And characteristics such as that axial-flow CO laser has is simple in structure, output high, pattern is good are the important devices of laser processing.Through tuning axial-flow CO laser, its optical maser wavelength coverage is 4.8 microns～8.4 microns, has nearly 400 spectral lines can make spectrum analysis usefulness, and the strong line of its 5.33 micron wave length is used for the separation by laser uranium isotope in the world, and is significant.
Existing axial-flow CO laser can be divided into two kinds substantially.A kind of full quartz (or full glass devices) that all adopts quartz material (or glass material) for its parts, because require to fall the temperature of gaseous mixture (carbon monoxide, nitrogen, helium) very low during axial-flow CO laser work, normally drop to about 100 ° of K or below, this just requires each parts such as heat exchanger, shunt, isocon, gas storage pond, discharge tube, convergence device in the laser all to be in the liquid nitrogen (77 ° of K).Full quartz material device just is meant that above-mentioned each parts and liquid nitrogen tank that needs are in the liquid nitrogen all use quartz material, and makes one complete quartzy whole.Because the quartzy coefficient of expansion is minimum, be same material because of complete quartzy whole again, so can realize the synchronous variation under the low temperature, this device can be moved at low temperatures.Though the discharge performance excellence of this axial-flow CO laser quartz discharge tube, the entire device vacuum performance might as well.But its processing technology complexity; And need use a large amount of expensive quartz materials, manufacturing cost height; Occur destructive the damage besides easily, integral body is the fragile article of a costliness; Make bigger laser if amplify in proportion, then safety problem more can not be ignored.Secondly, if annealing in process is bad in the manufacturing process, nature may occurs after use a period of time and burst, be exactly the poor-performing of complete its heat exchanger of quartz material device in addition.
Another kind of axial-flow CO laser is that discharge tube adopts earthenware or the insulating material pipe (being designated hereinafter simply as insulating material pipe) except that quartzy, ceramic, remaining part is that metal material constitutes, this axial-flow CO laser each several part all has higher intensity, and its heat exchanger effect is also better.But earthenware not only price is expensive, and the solder technology complexity between earthenware and metallic material parts; Generally all much thick because of pottery and insulating material tube wall again than quartz ampoule (or glass tube), work when being unfavorable for then that gaseous mixture low speed flows, vacuum seal trouble, and inaccessible requirement; The best located of electrode is very difficult besides, and the electrode best located can make axial-flow CO laser output obviously improve.
Purpose of the present invention is just at existing defective in the above-mentioned prior art, construction method and device thereof to axial-flow CO laser improve, and adopt quartz material to combine with metal material to carry out the axial-flow CO laser of fabrication and installation and provide a kind of.This laser had both kept the discharge performance of complete quartzy laser system discharge tube excellence, problems such as welding between earthenware or insulating material pipe and metallic material parts, the complicated trouble of encapsulating method have been overcome again, guaranteed that also the electrode best located is easy to realize, and made the performance of heat exchanger be better than corresponding quartz member.Significantly reduced the rapid wear part simultaneously, it is convenient that entire device can be processed assembling more respectively by each parts, changing-over damages parts, and reduced the cost of manufacture price.
The objective of the invention is to be realized by following measure: the construction method of axial-flow CO laser is to adopt quartz ampoule, metal material, insulating material to make.Its laser procurement process is: earlier with CO, N
2, three kinds of gases of He (carbon monoxide, nitrogen, helium) send into forecooler through mixing after gas cylinder mixes, after cools down, divide two-way to enter the gas storage pond at two independent discharge tube middle parts respectively again by isocon, then by two narrow annular channels respectively radial spray enter two sections discharge tubes, cryogenic gas discharges in discharge tube and flows to the two ends of every section discharge tube respectively, is taken away by lobe pump after convergence device compiles again.Carbon monoxide molecule was excited and is produced stimulated radiation when mist discharged at discharge tube, and stimulated radiation is under the control of total reflective mirror and outgoing mirror (still having very high reflectance), and laser is exported from outgoing mirror.Main points of the present invention are that the core of laser (they are all in liquid nitrogen) is that the method that adopts quartz ampoule, metal material, insulating material to combine is made.Discharge tube adopts quartz ampoule, and discharge performance is excellent also only to carry out in discharge tube in order to make, and gas storage pond, isocon and the pipeline from the anode to the convergence device also adopt quartz material.And two the electrical resistance that presented of pipe interior gas should be higher than the impedance that gas is had in the discharge tube; Secondly heat exchanger adopts copper product to make, and copper product is easy to processing, big several magnitudes of its thermal conductivity ratio quartz material, and can do the contact-making surface of heat exchanger and gaseous mixture very big, but cumulative volume and little; Again secondly, the gaseous mixture inlet and outlet piping, shunt, convergence device and corresponding interface components thereof and liquid nitrogen tank adopt the stainless steel metal material, and its vacuum performance is good, and constriction coefficient is little.Main points of the present invention also are, propose the naturality vacuum seal technology between quartz ampoule and metal tube port.
Accompanying drawing is an axial-flow CO laser structural representation of the present invention.
Below in conjunction with accompanying drawing, operation principle and embodiment the present invention is described in further detail.
In the accompanying drawing, three kinds of gas (carbon monoxide in the steel cylinder 1, nitrogen, helium) flow into certain proportion and flow into stainless steel forecooler 3 again after stainless steel reinforced concrete gas cylinder 2 mixes, flowing into the heat exchanger 5 that makes with copper product again through the gaseous mixture after the precooling further is cooled to about 100 ° of K, enter again in the stainless steel tube shunt 6 through stainless steel tube A then, gas in the shunt 6 enters the two quartzy gas storage ponds 9 at quartz discharge tube 8 middle parts of symmetry independently respectively by 7 fens two-way of quartzy isocon, cooling and mixing gas in the gas storage pond 9 by two narrow annular channels respectively radial spray enter quartz discharge tube 8, injection can make gaseous mixture further lower the temperature, cryogenic gas is in the discharge of two sections discharge tubes and flow to the two ends of every section discharge tube respectively, gaseous mixture is finally being taken away by lobe pump 13 after convergence device 10 compiles after the discharge again, carbon monoxide molecule was excited and is produced stimulated radiation when mist discharged in quartz discharge tube 8, stimulated radiation obtains laser output at outgoing mirror 15 under the control of total reflective mirror 14 and outgoing mirror 15 (still having very high reflectance).
The used discharge tube of the present invention is selected quartz ampoule 8, for make the discharge performance excellence.Simultaneously, only in discharge tube, carry out for making discharge, therefore isocon 7 and from the positive C to the convergence device pipeline B of 10 (convergence device double as grounded cathodes) all select quartz ampoule for use, and the electrical resistance that they internal gas presented should be higher than the impedance that gas is had in the discharge tube, because these pipe diameters are less, length is short, so process, changing-over is more convenient.The quartz ampoule good insulation preformance, any surface finish and the assorted gas of few absorption, thereby can not distribute assorted gas or himself produce because of electric field or heat effect during discharge and be harmful to laser working medium (CO, N
2, the He gaseous mixture) composition.And quartzy tube wall thin (general 1.5～2 millimeters), the heat that produces when helping managing the inner laser working media with the outer liquid nitrogen exchange of pipe discharge, particularly favourable to the raising laser output power when the working media flow velocity is not high.
Heat exchanger 5 adopts copper product to make, gaseous mixture inlet and outlet piping A, convergence device 10 and corresponding interface components and liquid nitrogen tank 4 adopt stainless steel material to make, be because metal material processing is easy, firm, particularly its vacuum performance of stainless steel is fine, also is convenient to be connected with large-scale lobe pump and gas mixer.Because the conductive coefficient of metal is very big, the very poor metal of this heat transfer of stainless steel is also high one more than the order of magnitude than the conductive coefficient of insulating material such as quartz, is desirable selection so make heat exchanger with copper material.Utilize its conductive coefficient big, can do the contact-making surface of heat exchanger and gaseous mixture very big, for example, a large amount of scale coppers is coupled together, and the gap is minimum between every, but this gap is enough big concerning gas molecule, the junction keeps directly contacting with liquid nitrogen, and heat exchanger cumulative volume and little.Yet the heat exchanger that makes huge contact-making surface with quartz material then is quite difficult thing.
It is to carry out vacuum seal between quartz ampoule and metal tube (copper material or stainless steel) port that the present invention adopts naturality vacuum seal technology.At first metal (stainless steel) port is processed into the circular open joint, its outside dimension is consistent with the quartz ampoule outside dimension that connects with it, again with the certain flexible polytetrafluoroethylene material of tool still under the big low temperature of the coefficient of expansion, be processed into smooth annulus, the length of annulus is about 5 centimetres, its internal diameter is than smaller 0.5 millimeter of the quartz ampoule that will dock, metal tube external diameter, then through heating, after treating that the smooth torus internal diameter increases, the quartz ampoule and the metal tube (as stainless steel tube) of butt joint are entangled, can reach vacuum-packed purpose.Show that through repeatedly testing this sealing technology is the sealed vacuum Du Keda 10 of pair of joint at room temperature
-2The millimetres of mercury height, safety not only under liquid nitrogen temperature, and also vacuum degree can reach 10
-3More than the millimetres of mercury height, reached axial-flow CO laser fully to vacuum requirements.The present invention adopts stainless steel material parts part also can make of brass or duralumin.
The present invention compared with prior art has following characteristics:
1. the present invention has excellent discharge performance, and the contact-making surface of metal heat exchanger and gaseous mixture is done very big, and conductive coefficient is big, and heat exchange performance significantly is better than other nonmetal heat exchangers.
2. the present invention proposes the naturality vacuum seal technology between quartz ampoule and metal tube port, and its method of operation is simple, convenient, and reaches desirable effect.
The device of axial-flow CO laser is mainly by dress CO, N
2He (carbon monoxide, nitrogen, helium) steel cylinder 1, stainless steel hybrid bottle 2, stainless steel forecooler 3, inlet and outlet piping A and liquid nitrogen tank 4, compositions such as stainless steel cooler 12 and lobe pump 13, copper heat exchanger 5 in the liquid nitrogen tank 4 is connected with stainless steel shunt 6, stainless steel shunt 6 has two quartzy isocons 7 to be connected with quartzy gas storage pond 9 in the quartz discharge tube 8, stainless steel convergence device 10 is in the liquid nitrogen of liquid nitrogen tank 4 with discharge tube junction and its underpart, its upper part is positioned on the liquid nitrogen surface and is installed on the supportive pipeline of switch 11, lobe pump 13 is connected with cooler 12, and laser output is by outgoing mirror 15 outputs.Assembling connection again after each parts of this device are processed respectively is convenient to changing-over and is damaged parts.Its advantage is:
This to install each parts be composite type, its process technology is better than whole device (as full quartz laser).
2. owing to be composite type, after can processing respectively by each parts, entire device assembles again, the operation sheet letter, and help device and amplify in proportion, make bigger axial-flow CO laser.
Claims (5)
1. the construction method of axial-flow CO laser is that each parts all adopts quartz ampoule in the liquid nitrogen tank (4), or metal material, insulating material etc. are made, and its laser procurement process is earlier with CO, N in the steel cylinder (1)
2He (carbon monoxide, nitrogen, helium) three kinds of gases are sent into forecooler (3) through mixing after gas cylinder (2) mixes, after heat exchanger (5) cooling, divide two-way to enter the gas storage pond (9) at two symmetrical discharge tubes (8) middle part respectively again by isocon (7), radially spray into two sections discharge tubes respectively by two narrow annular channels then, cryogenic gas discharges in discharge tube and flows to every section discharge tube two ends, after compiling, convergence device (10) takes away again by lobe pump (13), last laser is exported from outgoing mirror (15), it is characterized in that for making the discharge performance excellence, two independently symmetrical discharge tubes (8) adopt quartz ampoule in the liquid nitrogen tank (4), only in discharge tube, carry out for making discharge, gas storage pond (9), isocon (7) and the pipeline (B) from anode (C) to convergence device (10) also adopt quartz material, and the electrical resistance that two pipe interior gases are presented should be higher than the impedance that gas is had in the discharge tube; Secondly heat exchanger (5) adopts copper product to make, and its thermal conductivity coefficient is than big several magnitudes of quartz material, and can do the heat exchanger (5) and the contact-making surface of gaseous mixture very big, and cumulative volume and little; Gaseous mixture inlet and outlet piping (A), shunt (6), convergence device (10) and corresponding interface components thereof, liquid nitrogen tank (4) then adopt stainless steel material to make, stainless steel material is easy to processing, vacuum performance is good, constriction coefficient is little, and its feature also is to adopt between quartz ampoule and metal tube port naturality vacuum seal technology.
2. according to the said method of claim 1, it is characterized in that said naturality vacuum seal technology is that metal tube (as stainless steel tube) port is processed into the circular open joint, its outside dimension is consistent with the quartz ampoule outside dimension that connects with it, big with the coefficient of expansion, under the low temperature still the certain flexible polytetrafluoroethylene materials processing of tool become smooth annulus, about 5 centimetres of the length of annulus, its internal diameter is than the quartz ampoule that will dock, smaller 0.5 millimeter of metal tube external diameter, then through heating, after treating that the smooth torus internal diameter increases, the quartz ampoule and the metal tube of butt joint are entangled and can reach vacuum-packed purpose, and its vacuum degree at room temperature can reach 10
-2The millimetres of mercury height, safety not only under liquid nitrogen temperature, and vacuum degree can reach 10
-3More than the millimetres of mercury height, reached axial-flow CO laser fully to vacuum requirements.
3. according to claim 1 or 2 said methods, it is characterized in that adopting stainless steel material parts part, also can adopt brass or duralumin to make.
4. the device of axial-flow CO laser, mainly by steel cylinder (1), mix gas cylinder (2), forecooler (3), inlet and outlet piping (A) and liquid nitrogen tank (4), cooler (12), lobe pump (13), total reflective mirror (14), outgoing mirror compositions such as (15), it is characterized in that the copper heat exchanger (5) in the stainless steel liquid nitrogen groove (4) is connected with stainless steel shunt (6), stainless steel shunt (6) has two quartzy isocons (7) to be connected with quartzy gas storage pond (9) in the quartz discharge tube (8), stainless steel convergence device (10) is in the liquid nitrogen of liquid nitrogen tank (4) with discharge tube junction and its underpart, its upper part is positioned on the liquid nitrogen surface and is installed on the supportive pipeline of switch (11), lobe pump (13) is connected with cooler (12), and laser output is exported by outgoing mirror (15).
5. according to the said device of claim 4, it is characterized in that after each parts is processed respectively in the liquid nitrogen tank (4) of this device that assembling connects again, be convenient to changing-over and damage parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001130145A CN1140946C (en) | 2000-06-13 | 2000-06-13 | Method for building axial-flow Co laser and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001130145A CN1140946C (en) | 2000-06-13 | 2000-06-13 | Method for building axial-flow Co laser and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1328365A true CN1328365A (en) | 2001-12-26 |
| CN1140946C CN1140946C (en) | 2004-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001130145A Expired - Fee Related CN1140946C (en) | 2000-06-13 | 2000-06-13 | Method for building axial-flow Co laser and its device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370657C (en) * | 2006-02-23 | 2008-02-20 | 武汉海通激光技术有限公司 | Laser cathode fixing device |
| CN115597419A (en) * | 2022-12-15 | 2023-01-13 | 四川大学（Cn） | Precooler for aircraft engine |
-
2000
- 2000-06-13 CN CNB001130145A patent/CN1140946C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370657C (en) * | 2006-02-23 | 2008-02-20 | 武汉海通激光技术有限公司 | Laser cathode fixing device |
| CN115597419A (en) * | 2022-12-15 | 2023-01-13 | 四川大学（Cn） | Precooler for aircraft engine |
| CN115597419B (en) * | 2022-12-15 | 2023-03-28 | 四川大学 | Precooler for aircraft engine |
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| Publication number | Publication date |
|---|---|
| CN1140946C (en) | 2004-03-03 |
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