Comparative study of laser-induced damage of two reflective coatings in vacuum due to organic contamination

The impact of gaseous toluene contamination on the damage characteristics of two high reflectors (HR) at 1064 nm is investigated. It is found that laser-induced damage threshold of 45° p polarization reflection film decreases, while for 0° reflection film, toluene seems to be benign and increases laser-induced damage threshold of the film. The possible reason is analyzed and discussed. Different surface electric field distribution is the main cause of the difference of laser-induced damage of two HR films.