The mechanism of sudden change absorption loss in a sea- led transverse-flow CO_2 laser has been investigated. It indicates that the sudden change absorption of intracavity is caused by impurity gases released in operating laser.

• 研究了闭环横流CO_2激光器中突变吸收损耗的机理,指出器件运转时释放的杂气是引起突变吸收的原因。