High efficient laser could be obtained by up-converting, so a most important task is to improve the efficiency of up-conversion.
通过对上转换的研究可以得到效率更高的激光器，而提高上转换效率是当前研究的重中之重。
High efficient laser could be obtained by up-converting, so a most important task is to improve the efficiency of up-conversion.
通过对上转换的研究可以得到效率更高的激光器，而提高上转换效率是当前研究的重中之重。
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