Absorption modification by laser irradiation in DKDP crystals
Absorption modification by laser irradiation in DKDP crystals
复制标题
DOI：
10.3788/col201816.051601
复制
发表时间：
2018-05
影响因子：
3.5
通讯作者：
Xiaocong Peng;Yuanan Zhao;Yueliang Wang;Guohang Hu;L. Yang;J. Shao
中科院分区：
文献类型：
--
作者：
Xiaocong Peng;Yuanan Zhao;Yueliang Wang;Guohang Hu;L. Yang;J. Shao
研究了氘代磷酸二氢钾（DKDP）晶体在纳秒和亚纳秒激光辐照下的355 nm激光诱导改性，探讨了DKDP晶体损伤引发的吸收机制。亚纳秒级激光预处理显著提高了材料的抗激光损伤能力，而相同能量密度下纳秒级激光预处理对材料的抗激光损伤能力的提高很小。此外，两种类型的激光调节后的散射和透射率的变化表明类似的线性吸收的减少。然而，相比之下，使用Z扫描测量发现在非线性吸收修改上存在很大差异。这种特征吸收修改激光照射提供的证据表明，非线性吸收机制起着关键作用，在355 nm的损伤引发。
Laser-induced modification at 355 nm of deuterated potassium dihydrogen phosphate (DKDP) crystals following exposure to nanosecond (ns) and sub-ns laser irradiation is investigated in order to probe the absorption mechanism in damage initiation. Laser damage resistance is greatly improved by sub-ns laser conditioning, whereas only a little improvement occurred after ns laser conditioning at the same laser fluence. Moreover, scattering and transmittance variations after the two types of laser conditioning indicate similar reduction of linear absorption. However, by contrast, large differences on nonlinear absorption modification are discovered using Z-scan measurement. This characteristic absorption modification by laser irradiation provides evidence that a nonlinear absorption mechanism plays a key role in damage initiation at 355 nm.