光束发散角的测定方法有多种，本文提出一种新的测定方法，利用BBO晶体倍频中的角度匹配来测定发散角，精度较高．
A new method is designed to determinate the light beam dispersion angle according to the fact that the BBO crystal has a certain phase match angle on certain light-frequencies while doubling frequency. The method is simple and more precise.
参考文献
| [1] | Walter Koechner. Tunable Solid State Laser Engineering (MacAdam D L, Ed.). NewYork: SpringerVerlag, 1976. 491～531 |
| [2] | Walter Koechner. Tunable Solid State Laser Engineering Ⅱ (MacAdam D L, Schawlow A L, Shimoda K, Siegman A E, Eds.). NewYork: Springer-Verlag, 1985. 479～514 |
| [3] | A.亚里夫著,刘颂豪等译.量子电子学.上海：上海科学技术出版社,1982.445 |
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