高出力紫外レーザー光発生用CsLiB_6O_<10>結晶の育成 : 育成中における融液攪拌の効果(<小特集>バルク成長分科会特集 : 種結晶(核)からの結晶成長制御について)

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  • Growth of High-quality CsLiB_6O_<10> Crystal for High Power UV Generation : Effect of melt stirring during crystal growth(<Special Issue>On the Advanced Control Techniques of Crystal Growth Using Seed Crystals or Nuclei)
  • 高出力紫外レーザー光発生用CsLiB6O10結晶の育成--育成中における融液攪拌の効果
  • コウシュツリョク シガイ レーザーコウ ハッセイヨウ CsLiB6O10 ケッショウ ノ イクセイ イクセイ チュウ ニ オケル ユウエキ カクハン ノ コウカ

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CsLiB_6O_<10>(CLBO) crystals are superior in fundamental properties for the generation of UV light by frequency conversion. For high power UV light generation, it is necessary to develop technique for growing high-quality single crystals in order to prevent laser damage and thermal dephasing induced by UV light absorption. We have attained improvement of crystal quality by a newly developed melt stirring technique of highly viscous CLBO growth melt. By this mean, bulk laser induced damage threshold of CLBO have been improved by 2.5-fold as compared to crystals grown from melt without stirring. Further, self-heating generated by the absorption of UV light was also reduced. These improvements were due to the reduction of dislocation density in CLBO crystals. Mechanical properties such as Vickers hardness were also enhanced. As a result, we have obtained stable fourth harmonic generation of Nd:YAG laser (266 nm light) at an average power of 20 W for 100 hours continuously.

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