二极管泵浦内腔倍频抑制绿光噪声的实验研究
Experimental study of suppressing green noise in a diode-pumped intracavity-frequencydoubled laser
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摘要: 报道了在Nd:YAG棒和腔镜间插入四分之一波片，或在KTP倍频晶体和腔镜间插入四分之一波片，以及使用交叉双倍频晶体用以抑制二极管泵浦内腔倍频Nd:YAG激光器绿光噪声的实验结果。实验研究表明，使用上述三种方法之一能有效地减小折叠腔内的绿光噪声。用交叉倍频晶体可使噪声减小18％～25%。实验结果与理论一致，对实验中一些问题和值得进一步改进的地方也进行了讨论。Abstract: Experimental results of green noise suppression in a diode-pumped intracavity-doubled Nd:YAG laser by inserting a QWP between the Nd:YAG rod and mirror, or between the KTP frequency doubler and mirror,and using two cross-doubled crystals are presented. It is shown that the green noise in a folded resonator can be effectively reduced if one of the above methods is used. The introduction of two cross-doubled crystals has reduced the noise by 18％~25%.The experimental results are consistent with theoretical predications.Some problems in the experiment and further improvements are discussed．
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Key words:
- nonlinear optics /
- intracavity frequency-doubled laser /
- green problem /
- folded-resonator
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