In order to obtain the maximum conversion efficiency we always hope the pump source is operated at the maximum level , thus to raise the input pump energy , we have to apply the galilean telescope to input the pump beam , but it will lead to the bad pump beam quality and the large output beam linewidth 为了获得最大转换效率总希望使泵浦源运转在可达到的最高水平，因此不得不采用伽利略压缩望远镜输人泵浦光以提高输人泵浦光的能量，但是这同时使泵浦光质量变坏，使得输出线宽变大。
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