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Study of New Borate Crystal for Ultraviolet Light Generation

新型硼酸盐晶体产生紫外光的研究

基本信息

批准号：
08455038
负责人：
SASAKI Takatomo
金额：
$ 5.5万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The results obtained in this research are summarized as followings.We have obtained 266 nm and 213 nm output with a pulse energy of 600 mJ and 320 mJ,respectively, from the input of 2800 mJ.To the best of my knowledge, these have been the highest ever generated UV laser energy through NLO frequency conversion of nanoseconds pulsed Nd : YAG laser. There were no crystal temperature control applied in this work. Excellent output stability and rounded beam pattern were observed. High power all solid state UV laser via CLBO crystal is realized.Effect of doping on the various properties has been studied. It was found that Rb doping could shorten CLBO's SHG cutoff wavelength (lc), for example the lc became 2 nm shorter for the crystal grown from 10 mole % Rb-doped (Rs/Cd=0.1) melt. The Rb doping, however, has made CLBO more fragile. This was also the case for the K and Na doping. On the other hand, the Al doping could give rise to an enhancement of mechanical properties of CLBO.The Vickers hardness as a function of the Al/Cs ratio in the melt. Each data point represents an average value obtained from a number of indents on each sample. The hardness of undoped CLBO was 270 and 180 for (100) and (001) surfaces, respectively, while values for 1% Al-doped and 5% Al-doped CLBO were 290 and 310 for (100) and 220 and 230 for (001) surfaces. Actually, the Al-doped CLBO crystals have not been cracked even when they were the polycrystalline.It was found that the hygroscopic nature of CLBO become less by the Al doping. The undoped and 2%Al doped CLBO crystals were dissoved in the solution of H_2O (20%) and glycerin (80%) in order to investigate the effect of doping on resistance against water. The samples have been dipped in the solution during experiment. This experiment has shown that the Al-doped CLBO is less soluble than undoped CLBO.

主要研究结果如下：在2800 mJ的激光输入下，分别获得了脉冲能量为600 mJ和320 mJ的266 nm和213 nm的激光输出，据我所知，这是纳秒脉冲的NLO频率转换产生的最高的紫外光能量。在这项工作中没有应用晶体温度控制。观察到了良好的输出稳定性和圆角波束方向图。利用CLBO晶体实现了高功率全固态紫外光激光器，研究了掺杂对其各项性能的影响。结果表明，Rb掺杂可以缩短CLBO晶体的倍频截止波长，如掺Rb摩尔分数为10%(Rs/Cd=0.1)的熔体晶体的倍频截止波长缩短了2 nm。然而，Rb的掺杂使CLBO变得更加脆弱。K和Na兴奋剂的情况也是如此。另一方面，Al掺杂可以提高CLB的力学性能，维氏硬度与熔体中Al/Cs的比例有关。每个数据点代表从每个样本的多个缩进中获得的平均值。未掺杂的CLBO(100)和(001)表面的硬度分别为270和180，而掺杂1%Al和5%Al的CLBO在(100)和(001)表面的硬度分别为290和310和220和230。实际上，掺铝的CLBO晶体即使是多晶的也没有开裂，发现掺铝使CLBO的吸湿性变差。将未掺杂和2%Al掺杂的CLBO晶体分别溶解在20%的H_2O和80%的甘油溶液中，研究掺杂对CLBO晶体耐水性的影响。在实验过程中，样品被浸泡在溶液中。实验表明，掺铝的CLBO比未掺铝的CLBO的溶解度低。