CN1004848B - High power transversal flow co2 laser membrane selective cavity - Google Patents
High power transversal flow co2 laser membrane selective cavity Download PDFInfo
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- CN1004848B CN1004848B CN85104370.4A CN85104370A CN1004848B CN 1004848 B CN1004848 B CN 1004848B CN 85104370 A CN85104370 A CN 85104370A CN 1004848 B CN1004848 B CN 1004848B
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- laser
- mirror
- high power
- cavity
- coupled window
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Abstract
The present invention relates to a membrane selective cavity which is suitable for high power transversal flow CO2 laser, which is composed of a spherical reflector and a dual-spherical coupling window. The present invention has the characteristics of simple structure, wide adjusting range of the cavity, high electro-optical conversion efficiency, good beam directionality, etc., and can not be influenced by the gain factor and length of lasers.
Description
The invention belongs to crossing current CO
2Laser cavity is specially adapted to high power transverse flow CO
2Laser improves the directivity of laser beam, obtains the output of single mode or low-order mode.
For satisfying high power (kilowatt and even myriawatt) CO
2Laser multipurpose industrial processes, as laser glazing, deep and thorough welding and cutting need, and especially to the welding and the cutting of thicker metal material, require laser beam that good directivity is arranged.Improving crossing current CO abroad
2The laser beam quality aspect has been done more than ten years work, but up to the present, except adopting seven folding chambeies (elongate chamber method), U.S. GTB Sylvania company obtains single mode and the low-order mode output (seeing United States Patent (USP) 3772610), all the other all adopt unsteady cavity to improve beam quality, for example U.S. AVCO company myriawatt unsteady cavity crossing current CO
2Laser (Fig. 1) (seeing Applied Optics13,1979(1974)), myriawatt level four vibrations in Soviet Union Institute for Atomic Research are once amplified, unsteady cavity crossing current CO
2Laser (Fig. 2) (seeing Sov.J.Quant Electr10,1439(1980)), multikilowatt two passage unsteady cavities crossing current CO counts in the Culham laboratory in Britain
2Laser (Fig. 3) (see Optics and Laser Technology10,29, (1978)), multikilowatt unsteady cavity crossing current CO counts in Japanese mitsubishi electric research institute
2Laser (Fig. 4) (seeing L--research, No. 2 43(1982 of the 10th volume)).By Fig. 1 to Fig. 4 as can be seen, unsteady cavity is more complicated technically, needs to adopt side-coupled output, wants four chamber mirrors at least, and is hollow annular output; Unsteady cavity requires that higher gain coefficient and gain length are arranged, and promptly enlargement ratio should not be too little, otherwise can directly influence the far field focus characteristics; Unsteady cavity is adjusted difficulty, and optical stability requires high, adjusts tolerance limit 10
-5The radian magnitude.
The objective of the invention is to simplify the structure in chamber as far as possible and obtain good laser beam, require to reach the laser power height, the beam directionality is good, and it is big to adjust tolerance limit.
High power transverse flow CO of the present invention
2The laser membrane selective cavity is a kind of two concave-sphere membrane selective cavities, as shown in Figure 5.1 is the laser coupled window among the figure, the 2nd, and laser mirror is spherical mirror, and the laser coupled window is bispherical concave-convex lens, and when speculum was concave mirror, it and the convex surface laser coupled window in the chamber satisfied following relationship:
When speculum was convex reflecting mirror, (as Fig. 6) it and concave surface laser coupled window in the chamber satisfied following relationship:
The lateral dimension of mirror 1 and mirror 2 is to guarantee that laser beam is not tackled.
In the above-mentioned formula, R
1Be the radius of curvature of laser coupled window two spheres, R
2Be the curvature of speculum, L is a distance between two mirrors.
The laser coupled window is made with ZnSe or GaAs, the periphery water cooling; Speculum is copper gold-plated, adopts back side water-cooled.
High power transverse flow CO of the present invention
2The laser membrane selective cavity, experiment shows to have following advantage:
1. features simple structure;
2. can adopt not that plated film ZnSe makes coupling window, full spot output;
3. limited by gain coefficient and gain length, can adopt coating technique to select suitable transmitance;
4. adjust the tolerance limit broad, Theoretical Calculation and actual measurement show that the adjustment tolerance limit in this kind chamber is 10
-4Measurement level than the big order of magnitude of unsteady cavity, helps the stability requirement of long-time continuous running greatly.
5. electro-optical efficiency height is greater than 12%.
6. beam directionality, 80% laser energy is within 2 milliradians (half-angle).
Experiment shows, utilizes membrane selective cavity of the present invention, has obtained the output of 3000 watts of low-mode lasers, compares with multimode output, is about about 90%.
Claims (8)
1, a kind of high power transverse flow CO
2The laser membrane selective cavity, form by a laser coupled window (1) and a laser mirror (2), it is characterized in that said laser coupled window and laser mirror are spherical mirror, and when speculum was concave mirror, it and the convex surface laser coupled window in the chamber satisfied following relationship.
When speculum was convex mirror, it and the concave surface laser coupled window in the chamber satisfied following relationship:
The lateral dimension of mirror 1 and mirror 2 is to guarantee that laser beam is not tackled.
Wherein B1 is the radius of curvature of laser coupled window (1), R
2Be the radius of curvature of speculum (2), L is a distance between two mirrors.
2, a kind of according to the said high power transverse flow CO of claim 1
2The laser membrane selective cavity is characterized in that said laser coupled window is ZnSe or GaAs, and said laser mirror is copper gold-plated.
3, a kind of according to claim 1 or 2 said high power transverse flow CO
2The laser membrane selective cavity is characterized in that the periphery water cooling of said laser coupled window, and said laser mirror is taked back side water-cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104370.4A CN1004848B (en) | 1985-06-08 | 1985-06-08 | High power transversal flow co2 laser membrane selective cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104370.4A CN1004848B (en) | 1985-06-08 | 1985-06-08 | High power transversal flow co2 laser membrane selective cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104370A CN85104370A (en) | 1986-12-03 |
| CN1004848B true CN1004848B (en) | 1989-07-19 |
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ID=4793802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104370.4A Expired CN1004848B (en) | 1985-06-08 | 1985-06-08 | High power transversal flow co2 laser membrane selective cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004848B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369711B (en) * | 2007-08-17 | 2011-08-10 | 沈阳大陆激光成套设备有限公司 | Practical three-folding optical cavity apparatus of transverse flow CO2 laser |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356911A (en) * | 2017-09-01 | 2017-11-17 | 中恩光电科技（苏州）有限公司 | A kind of device for reducing laser radar system transmitting laser beam divergence |
-
1985
- 1985-06-08 CN CN85104370.4A patent/CN1004848B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369711B (en) * | 2007-08-17 | 2011-08-10 | 沈阳大陆激光成套设备有限公司 | Practical three-folding optical cavity apparatus of transverse flow CO2 laser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104370A (en) | 1986-12-03 |
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