Experimental study on damage of optical coating irradiated by high repetition rate DPL laser

High repetition rate laser damage properties of optical coating have been the focus of the laser film researchers. In order to study the damage characteristics of optical coatings at high repetition rate laser irradiation, and explore the damage mechanism, in this paper, experimental study on the damage of optical thin film components at 10 kHz repetition rate DPL laser irradiation was made. The results show that modification of electric field distribution in the coatings, and reduce the peak value of electric field intensity of high refractive index material in the coatings can improve the laser damage threshold of coatings at high repetition rate laser irradiation. The damage mechanism of optical thin film components irradiated by repetition frequency laser was discussed. High repetition rate laser irradiation damage in substance is the micro-damage accumulation of amplification which caused by the combination effect of thermal effect and field effect. When the absorption rate of coatings is small, the damage is mainly caused by the micro-damage of filed effect cumulative amplification. When the absorption rate of coatings is high, that is mainly caused by the micro-damage of thermal effect cumulative amplification.