Effect ofλ/2 SiO_(2) overcoat on the laser damage of HfO_(2)/SiO_(2) high reflec

The effect of λ/2 SiO_(2) overcoat on the laser damage characteristics of HfO_(2)/SiO_(2) high-reflector (HR) coatings is investigated with 1-on-1 and N-on-1 laser damage test methods. The laser damage surface of 1-on-1 is analyzed by a step analyzer. The surface morphologies show that laser damage