A double-end-pumped microchip laser is developed to investigate the superposition and competition of the Laguerre-Gassian (LG) modes. It is found that two LG modes can be directly superposed when the excited regions are well separated. Conversely, when the inversion populations have a considerable overlap, strong competition occurs between LG modes. The experimental result is generally consistent with the theoretical prediction for cylindrically symmetric class B lasers.
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Chen et al. (2001) studied this question.
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