利用特征向量法分析有源失调腔的2维模场
Misalignment analysis of an active resonator using eigenvector method
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摘要: 利用一种用于光腔模式及光束传输模拟计算的特征向量法计算有源腔的2维失调，通过对谐振腔几何关系的求解，以及对增益进行薄层模型处理，最后利用特征向量法计算有源腔失调后的模式分布，发现失调造成了模式强度分布不均匀，并带来模式阶数的改变。计算了相应的光束质量因子，结果表明:在一定失调范围内，失调可能会带入新的模式竞争；谐振腔在一定范围的失调情况下，各阶模式的光束质量可能变好，也有可能变差，随着模式阶数的增加光束质量整体趋势是越来越差；原来简并的模式可能不再简并。该方法可以为计算失调后谐振腔的模场带来方便。Abstract: An eigenvector method is used to calculate the mode distribution, misalignment and beam quality factor of a resonator with a two-dimensional misalignment angle. In the calculation model, the gain medium is regarded as a sheet inside the mirror. It is found that resonator misalignment leads to the uneven distribution of modes and the change of mode orders. And when the misalignment is in a certain range, it may bring forth new mode competition. The beam quality factor will not always get bad when disorder level increases, however, beam quality generally degrades as mode orders increases, and some degenerate modes may not be degenerate any more.
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Key words:
- laser resonator /
- eigenvector method /
- resonator modes /
- two-dimension misalignment angle /
- gain /
- beam quality factor
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