Yin Xianhua, Tao Yongxiang, Liang Baogen, Cui Jianli, Chen Lifei. Study on CVL beams[J]. Chinese Journal of Lasers, 1988, 15(9): 558
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It was found that the annular structure of the stimulated emission is mainly due to nonuniform decay of the lower active level or the ground state "thermal dumping" resulting from excessive heat in axial region of the discharge tube.