Intensity modulation in single-mode microchip Nd:YAG lasers with asymmetric external cavity
Intensity modulation in single-mode microchip Nd:YAG lasers with asymmetric external cavity
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DOI：
10.1088/1009-1963/16/4/026
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
Yi-Dong Tan;Shu-lian Zhang;Wei-Xin Liu;Mao Wei
中科院分区：
文献类型：
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作者：
Yi-Dong Tan;Shu-lian Zhang;Wei-Xin Liu;Mao Wei
研究了单模微芯片Nd:YAG激光器中不对称外腔诱导的光强调制。讨论了基于多重反馈效应的两种实验结果。在一种情况下，强度调制曲线为正弦波，由于多重反馈效应，其条纹频率比传统光反馈系统的条纹频率高4倍。在另一种情况下，强度调制曲线是上述四倍频信号与常规光反馈信号的重叠，这是由不对称外腔诱导的附加相位差决定的。理论分析与实验结果吻合较好。激光输出强度的四倍频调制可以大大提高光反馈系统位移测量的分辨率。
Intensity modulation induced by the asymmetric external cavity in single-mode microchip Nd:YAG lasers is presented. Two kinds of experimental results are discussed based on multiple feedback effects. In one case, the intensity modulation curve is a normal sine wave, whose fringe frequency is four times higher than that of a conventional optical feedback system, caused by multiple feedback effects. In the other case, the intensity modulation curve is the overlapping of the above quadruple-frequency signal and conventional optical feedback signal, which is determined by the additional phase difference induced by the asymmetric external cavity. The theoretical analyses are in good agreement with the experimental results. The quadruple-frequency modulation of the laser output intensity can greatly increase the resolution of displacement measurement of an optical feedback system.