Laser-induced damage of the optical coatings due to organic contamination in vacuum

► We show the effect of organic contaminations on the laser-induced damage in vacuum. ► Surface adsorption layer model was presented to evaluate this impact. ► The distributions of electric field and temperature field were calculated. ► The mere organic contaminations cannot induce the thermal damage of the films. ► The decrease of LIDTs is due to the inter-coupling between defects and contaminations.