Abstract
To obtain thermal damage characteristics of the HgCdTe crystal irradiated by a CO2 laser,the theoretical model of Hg0. 784Cd0. 216Te crystal damaged by the high repetition frequency CO2 laser was developed,and then the damage thresholds of Hg0. 784Cd0. 216Te crystal irradiated by a single pulse laser and a high repetition frequency laser were calculated based on the finite element method. Finally,the effect of irradiation time and laser repetition frequency on the damage thresholds was analyzed. The results show that the damage threshold of the crystal radiated by a single pulse laser is 64. 5 J / cm2. In the high repetition frequency( f 1 kHz) CO2laser irradiation,the damage threshold of the crystal mainly depends on the laser average power density and irradiation time,and is independent of the laser repetition frequency. With the increase of irradiation time,the damage threshold can effectively be reduced. When the laser average power density is less than1. 95 kW / cm2,the crystal damage will not occur. The conclusions have a reference value for laser processing and protection.
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