紫外、深紫外非线性光学晶体探索十年回顾

Overview of Violet and Deep-UV Nonlinear Optical Crystals in the Last Decade

本文讨论了近 10年来我们研究组在探索紫外、深紫外非线性光学晶体方面的经历。这些经历中有成功的一面 ,也有不成功的一面。成功的一面包括KBBF晶体的发现及最短倍频波的输出( 184 .7nm) ,以及最近使用的一种特殊的器件设计 ,使KBBF晶体能够产生有效的深紫外谐波光输出 ;KABO晶体的发现及厘米级晶体的获得 ,有可能使此晶体在Nd∶YAG激光的 4、5倍频器件中得到应用。而我们没有想到的是线性和非线性光学性能均很优秀的SBBO晶体 ,却发现结构的完整性有问题 ,目前还不能得到实际的应用 ,在今后仍需花很大的精力去研究它。最后 ,我们虽然已花了 10年时间 ,但深紫外非线性光学晶体仍旧没有得到理想的解决 ,还需我们继续努力。由此可见 ,一个科学问题的认真解决 ,是需要花非常长的时间。本文希望把我们研究组的近 10年来的经验写出来 ,供大家参考 ,以求共勉。

The investigations on violet and deep UV nonlinear optical crystals over the last decade,including successes and failures,are discussed in this paper.Successes include the discovery of KBBF crystal which produces the shortest second harmonic output (184.7nm),and KABO crystal which has been successfully grown to centimeter size and is a promising candidate for the fourth and fifth harmonic generation of Nd∶YAG laser light.However,we were surprised that the SBBO crystal which has good linear and nonlinear properties lacks structural completeness.As a result,the crystal cannot be used yet.Although we have spent about ten years on this field,the search for deep UV nonlinear optical crystals is still not satisfactory.In the near future we will make greater efforts to improve the quality of the crystals we have discovered and will continue to search for the new ones that can overcome the problems of existing crystals.