The cooperative effect radiation loss of the optical pumped solid laser has been investigated. The characteristics and the cause of coherent spontaneous are discussed using Maxwell-Bloch equation in the paper. By laser rate equation, the expression of upper energy level lifetime shortening due to the cooperative effect radiation is given.The influence of the cooperative effect on laser threshold and the loss are analyzed. By a series of experiments, the relation ship of coherent spontaneous radiation intensity and direction with reversal population and the power of optical pump are obtained.
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