Jiang Xiuqing, Ji Lailin, Liu Dong, Tang Shunxing, Zhu Baoqiang, Lin Zunqi
Appl Opt. 2016 May 20;55(15):4132-8. doi: 10.1364/AO.55.004132.
The noncritically phase-matched (NCPM) fourth-harmonic generation (FHG) with partially deuterated dihydrogen phosphate (KDP) crystal at an Nd:glass laser radiation wavelength of 1053.1 nm has been confirmed. NCPM FHG has been achieved in 70% and 65% deuterated KDP crystal at the temperature of 17.7°C and 29.3°C, respectively. The angular acceptance of 70% and 65% deuterated KDP crystals fixed at their NCPM temperature were measured, which were 53 and 55 mrad, respectively. The application of the NCPM FHG in a high-power laser facility for inertial confinement fusion is also discussed. Based on the theoretical analysis, the NCPM KDP can be placed after the focus lens; thus, the laser-induced damage of a fused-silica lens at ultraviolet can be avoided.
已证实，在波长为1053.1 nm的钕玻璃激光辐射下，使用部分氘代磷酸二氢钾（KDP）晶体可实现非临界相位匹配（NCPM）的四次谐波产生（FHG）。分别在17.7°C和29.3°C的温度下，在氘含量为70%和65%的KDP晶体中实现了NCPM FHG。测量了固定在其NCPM温度下的氘含量为70%和65%的KDP晶体的角度接受度，分别为53和55 mrad。还讨论了NCPM FHG在用于惯性约束聚变的高功率激光装置中的应用。基于理论分析，NCPM KDP可放置在聚焦透镜之后；因此，可以避免紫外光下熔融石英透镜的激光诱导损伤。
