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本文给出一种测量掺Ｃｒ４＋饱和吸收体基态和激发态吸收截面的方法，并用之测得国产Ｃｒ４＋：ＹＡＧ的两个吸收截面分别为４．３×１０－１８ｃｍ２和８．２×１０－１９ｃｍ２；同时给出一种用泵浦探测法测量可饱和吸收体μｓ量级基态恢复时间的方法，并用之测得国产Ｃｒ４＋：ＹＡＧ的基态恢复时间为３．２μ
In this paper, a method for measuring the absorption cross section of ground and excited states of Cr4 + saturated absorber is given. The measured absorption cross sections of domestic Cr4 +: YAG are 4.3 × 10-18cm2 and 8.2 × 10-19cm2 At the same time, a method of measuring the ground-state recovery time of μs order of saturable absorber by pump detection is given. The recovery time of ground state of domestic Cr4 +: YAG is 3.2μ