Research Center for Laser Physics and Technology, Key Lab of Functional Crystal and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Opt Lett. 2012 Jun 15;37(12):2403-5. doi: 10.1364/OL.37.002403.
We demonstrate a high-power UV 278 nm laser by fourth-harmonic generation (FHG) of a 1112 nm Nd:YAG laser in a nonlinear optical (NLO) crystal CsB3O5 (CBO) for the first time, to our best knowledge. A 30 W level diode-pumped Q-switched Nd:YAG laser at 1112 nm with beam quality factor M2=1.2 was used as the fundamental light source at a pulse width of 500 ns. With an LiB3O5 crystal, the 1112 nm laser was first frequency-doubled to 556 nm with an average output power of 13.5 W. It was then frequency doubled again in a CBO crystal to obtain the FHG output at 278 nm. The maximum average output power of the 278 nm laser is up to 1.5 W. The results demonstrated that CBO crystal is a promising NLO material for UV high-power lasers below 300 nm.
我们首次通过非线性光学（NLO）晶体 CsB3O5（CBO）中的四次谐波产生（FHG）将 1112nm 的 Nd：YAG 激光转换为高功率 278nm UV 激光，就我们所知。我们使用了 1112nm 的 30W 级二极管泵浦调 Q Nd：YAG 激光，其光束质量因子 M2=1.2，脉冲宽度为 500ns。利用 LiB3O5 晶体，将 1112nm 激光首次倍频至 556nm，平均输出功率为 13.5W。然后在 CBO 晶体中再次倍频，以获得 278nm 的 FHG 输出。278nm 激光的最大平均输出功率高达 1.5W。结果表明，CBO 晶体是一种很有前途的用于低于 300nm 的紫外高功率激光器的 NLO 材料。
