这句话我该怎么理解啊???急!!!!
the bad beam quality from the laser diode caused insufficient usage of the incident pump power on the crystal;and some of the pump power absorbed at the exit side of the crystal cannot excite enough population inversion inside the gain medium.这个exit side指的是什么???? 这个exit side按字面意思是指"gain medium"的输出端口,为了提高泵浦光的利用率,一般在gian medium的exit side镀pump light的HR膜,看整段话的意思是增益介质的输出端对泵浦光有一定的吸收,导致增益介质内反转粒子数不够。 泵浦光光束质量差 泵浦光利用率就会下降 增益介质末端吸收的泵浦光可能都不够粒子能级分布数反转
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