Comparative evaluation of GdCOB and YCOB nonlinear optical properties in principal and out of principal plane configurations for the 1064 nm Nd:YAG laser frequency conversion
Comparative evaluation of GdCOB and YCOB nonlinear optical properties in principal and out of principal plane configurations for the 1064 nm Nd:YAG laser frequency conversion
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DOI：
10.1117/12.379907
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发表时间：
2000-03
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影响因子：
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通讯作者：
G. Aka;F. Mougel;D. Pelenc;B. Ferrand;D. Vivien
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文献类型：
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作者：
G. Aka;F. Mougel;D. Pelenc;B. Ferrand;D. Vivien
用提拉法从熔体中生长出光学质量良好的大尺寸YCOB和GdCOB晶体。它们通常直径50毫米，长150。我们用菲涅耳公式计算了1064 nm倍频辐射的第一类和第二类组态的GdCOB和YCOB相位匹配角轨迹。利用飞秒宽带脉冲测量了YCOB三个主平面的I类倍频相位匹配角，并与计算值进行了比较。对YCOB和GdCOB的不同晶体进行了切割和抛光，得到了第一类和第二类相互作用的主平面构型。此外，还利用从主平面选择的倍频构型切割了晶体。在相同的实验条件下，研究了调Q晶体的倍频转换效率与晶体的角度接受角、离散角和非线性系数的关系。第二类配置提供了最高的角度接受度。YCOB和GdCOB的高损伤阈值和相对较大的角度接受度使效率超过50%。
Large and good optical quality crystal of YCOB and GdCOB were grown from the melt by Czochralski technique. Typically they are 50 mm in diameter and 150 long. We have used the Fresnel formula to calculate GdCOB and YCOB phase matching angle loci for SHG of 1064 nm radiation, in type I and type II configurations. We have used femtosecond broadband pulses to measure the phase matching angels in type I SHG for the three principal planes of YCOB and compared them to the computed values. Different crystals of YCOB and GdCOB were cut and polished in principal plane configurations for type I and type II interactions. Moreover, crystal were also cut by using some SHG configurations selected out of principal planes. All these crystal were used to evaluate in the same conditions, the SHG conversion efficiency of Q-switched Nd:YAG laser in relation with the angular acceptance, walk- off angle and the non-linear coefficients which were also determined. The type II configurations give the highest angular acceptance. The high damage threshold and the relatively large angular acceptance of YCOB and GdCOB led to efficiency greater than 50 percent.