Xu Mingxia, Liu Baoan, Zhang Lisong, Ren Hongkai, Gu Qingtian, Sun Xun, Wang Shenglai, Xu Xinguang
State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China.
Light Sci Appl. 2022 Jul 29;11(1):241. doi: 10.1038/s41377-022-00929-y.
In this review, we introduce the progress in the growth of large-aperture DKDP crystals and some aspects of crystal quality including determination of deuterium content, homogeneity of deuterium distribution, residual strains, nonlinear absorption, and laser-induced damage resistance for its application in high power laser system. Large-aperture high-quality DKDP crystal with deuteration level of 70% has been successfully grown by the traditional method, which can fabricate the large single-crystal optics with the size exceeding 400 mm. Neutron diffraction technique is an efficient method to research the deuterium content and 3D residual strains in single crystals. More efforts have been paid in the processes of purity of raw materials, continuous filtration technology, thermal annealing and laser conditioning for increasing the laser-induced damage threshold (LIDT) and these processes enable the currently grown crystals to meet the specifications of the laser system for inertial confinement fusion (ICF), although the laser damage mechanism and laser conditioning mechanism are still not well understood. The advancements on growth of large-aperture high-quality DKDP crystal would support the development of ICF in China.
在本综述中，我们介绍了大口径DKDP晶体生长方面的进展以及晶体质量的一些方面，包括氘含量的测定、氘分布的均匀性、残余应力、非线性吸收和抗激光损伤性能，这些内容涉及其在高功率激光系统中的应用。通过传统方法已成功生长出氘化水平为70%的大口径高质量DKDP晶体，该晶体可用于制造尺寸超过400毫米的大型单晶光学元件。中子衍射技术是研究单晶中氘含量和三维残余应力的有效方法。为了提高激光损伤阈值（LIDT），在原材料纯度、连续过滤技术、热退火和激光处理等工艺方面付出了更多努力，尽管激光损伤机制和激光处理机制仍未完全明确，但这些工艺使目前生长的晶体能够满足惯性约束聚变（ICF）激光系统的规格要求。大口径高质量DKDP晶体生长方面的进展将支持中国ICF的发展。
