Effect of Crystal Defects on Laser-Induced-Damage Tolerance of Organic Crystal, 4-Dimethylamino-N-methyl-4-stilbazolium Tosylate
Effect of Crystal Defects on Laser-Induced-Damage Tolerance of Organic Crystal, 4-Dimethylamino-N-methyl-4-stilbazolium Tosylate
复制标题
DOI：
10.1143/jjap.46.318
复制
发表时间：
2007-01
影响因子：
1.5
通讯作者：
Yoshinori Takahashi;K. Sugiyama;S. Brahadeeswaran;S. Onzuka;T. Kamimura;M. Yoshimura;Y. Mori;K. Yoshida;T. Sasaki
中科院分区：
文献类型：
--
作者：
Yoshinori Takahashi;K. Sugiyama;S. Brahadeeswaran;S. Onzuka;T. Kamimura;M. Yoshimura;Y. Mori;K. Yoshida;T. Sasaki
为了提高有机太赫兹晶体的抗激光损伤能力，研究了有机太赫兹晶体4-二甲氨基-N-甲基-4-甲苯磺酸芪（DAST）的各种缺陷.我们使用了在甲醇溶液中缓慢冷却法生长的DAST晶体，并用波长为1550 nm的红外激光照射而没有DAST吸收。结果发现，激光损伤是容易造成的晶体缺陷，如粗糙的表面，孪晶界，和窄线缺陷（NLD）的体积。特别地，NLD是降低DAST晶体的体激光诱导损伤耐受性的严重问题。没有这种缺陷的DAST晶体具有很高的激光损伤容限。为了抑制晶体缺陷的形成，我们修改了晶体生长条件，并成功地生长DAST晶体，其缺陷比通过常规生长工艺获得的晶体少。
We investigated various defects of the organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal to improve its laser-induced-damage tolerance for high-power terahertz (THz) application. We used DAST crystals grown by the slow-cooling method in methanol solution, and an irradiated infrared laser with a wavelength of 1550 nm without DAST absorption. It was found that laser damage was easily caused by crystal defects such as a rough surface, twin boundaries, and narrow-line defects (NLDs) in the bulk. In particular, NLDs are a serious problem that degrade the bulk laser-induced-damage tolerance of DAST crystals. The DAST crystals without such defects have high laser-induced-damage tolerance. To suppress the formation of crystal defects, we modified the crystal-growth conditions, and succeeded in growing DAST crystals with fewer defects than crystals obtained by the conventional growth process.