Non-critical phase matching of Gd_xY_1−xCa₄O(BO₃)₃(Gd_xY_1−xCOB) crystal

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• 作者：Wang ; Zhengping ; Xu ; Xinguang ; Fu ; Kun ; Song ; Renbo ; Wang ; Jiyang ; Wei ; Jingqian ; Liu ; Yaogang ; et. al.
• 关键词：42.65.Ky ; 42.70.Mp ; 81.10.Fq ; B. Crystal growth ; D. Optical properties ; E. Nonlinear optics
• 刊名：Solid State Communications
• 出版年：2001
• 出版时间：November 2, 2001
• 年：2001
• 卷：120
• 期：9-10
• 页码：397-400
• 全文大小：78.9 K

文摘

By using an optical parametric amplifier (OPA), we have measured the non-critical phase-matching (NCPM) wavelengths for frequency-doubling (including type I and type II) in different Gd_xY_1−xCOB crystals. From the Sellmeier equations of YCOB and GdCOB, we calculated the ranges of NCPM wavelengths in Gd_xY_1−xCOB, and compared them with the data obtained from our experiment. When the output power of a mode-locked Nd/YAG laser is 110mW (λ=1.064μm), a conversion efficiency of 37 % is obtained for the type II NCPM frequency-doubling in Gd_0.2Y_0.8COB crystal. Using a KTP crystal as frequency-doubler, we have achieved NCPM third harmonic generation (THG) in Gd_0.22Y_0.78COB crystal. When the output power of Nd/YAG laser is 94mW and the power of the second-harmonic wave is 38mW, THG conversion efficiency can reach 21 % .