Harmonic mode locking of the Nd:YAG laser
Harmonic mode locking of the Nd:YAG laser
复制标题
Nd:YAG 激光器的谐波锁模
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
A. Siegman
中科院分区：
文献类型：
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作者：
M. Becker;D. Kuizenga;A. Siegman
本文给出了Nd：YAG激光器在N = 2，3，4和5倍基频（c/2L）下用腔内相位调制器实现N次谐波锁模的实验和理论结果。由此产生的锁模光谱的带宽取决于调制频率、调制深度和激光腔损耗，与Kuizenga和Siegman的高斯脉冲分析非常一致[5]。对于在N（c/2L）处的调制，在所有情况下所得到的脉冲重复频率也是N（c/2L）。然而，在N = 2的情况下，例如，如果激光棒位于激光腔的中心附近，则锁模光谱包括每个相邻的轴向模式分量，但是当棒位于激光腔的端部时，仅包括每隔一个的轴向模式。这种行为是解释一个兰姆型的理论分析，考虑到两个“超模式”之间的竞争，或交错的下一个相邻的轴向模式，可以单独或同时振荡的N = 2的情况下。
We present experimental and theoretical results for N th harmonic mode locking of a Nd:YAG laser with an intracavity phase modulator operating at N = 2, 3, 4, and 5 times the fundamental c/2L frequency. The bandwidths of the resulting mode-locked spectra depend upon modulation frequency, modulation depth, and laser cavity losses in good agreement with the Gaussian-pulse analysis of Kuizenga and Siegman [5]. For modulation at N(c/2L) the resulting pulse-repetition frequency is also N(c/2L) in all cases. However, in the N = 2 case, for example, the mode-locked optical spectrum includes every adjacent axial mode component if the laser rod is located near the center of the laser cavity, but only every other axial mode when the rod is located at the end of the laser cavity. This behavior is explained by a Lamb-type theoretical analysis taking into account the competition between the two "hypermodes," or sets of interleaved next-adjacent axial modes, that can oscillate separately or simultaneously in the N = 2 case.