首页> 外文会议>Conference on laser resonators and beam control XI; 20090126-27; San Jose, CA(US) >Frequency doubling of focused laser beams for high pulse energy at 471nm
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Frequency doubling of focused laser beams for high pulse energy at 471nm

机译:聚焦激光束的倍频可实现471nm的高脉冲能量

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摘要

An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.
机译:主动调Q的942nm波长Nd:GSAG激光器在关键的I型相位匹配LBO中倍频。在10Hz处有19mJ入射辐射,在471 nm处具有300ns脉冲持续时间的最大脉冲能量为8mJ。相应的转化效率为42%。聚焦高斯光束的倍频涉及由于光束发散而在空间上引起的相位失配。它降低了转换效率并降低了光束质量。根据理论计算,椭圆聚焦用于改善二次谐波光束质量并稍微提高转换效率。

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