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Rapid growth of a large size, highly deuterated DKDP crystal and its efficient noncritical phase matching fourth-harmonic-generation of a Nd:YAG laser

机译:大尺寸,高度氘化的DKDP晶体的快速生长及其有效的非临界相匹配Nd:YAG激光器的第四谐波产生

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摘要

A high quality, large size (100 x 105 x 96mm(3)) deuterated potassium dihydrogen phosphate (DKDP) crystal with high deuterium content was successfully grown by the rapid growth method. A noncritical phase matching (NCPM) fourth-harmonic-generation (FHG) of Nd:YAG laser (1064 nm) was realized at 39.7 degrees C or so. The smallest full width at half maximum (FWHM) of angular acceptance for the longest crystal sample (20 mm) is 33.5 mrad, which is 10 times larger than the value of critically PM of a KDP crystal. The FHG conversion efficiency increases with the crystal length and reaches 64% for the 20 mm long crystal. As we have known, this is the highest FHG conversion efficiency of a 1064 nm laser with a repetition rate of 10 Hz in low drive conditions.
机译:通过快速生长方法成功地生长了具有高氘含量的高质量,大尺寸(100 x 105 x 96mm(3))氘代磷酸二氢钾(DKDP)晶体。 Nd:YAG激光(1064 nm)的非临界相位匹配(NCPM)第四谐波产生(FHG)在39.7摄氏度左右实现。最长的晶体样品(20毫米)的最小角度接受半峰全宽(FWHM)为33.5 mrad,这比KDP晶体的临界PM值大10倍。 FHG转换效率随晶体长度的增加而增加,对于20 mm长的晶体达到64%。众所周知,在低驱动条件下,这是1064 nm激光器的最高FHG转换效率,重复频率为10 Hz。

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