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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 1, Iss. 6 — Jun. 20, 2003
  • pp: 340–342

Effect of?/2 SiO_(2) overcoat on the laser damage of HfO_(2)/SiO_(2) high-reflector coatings

Jianping Hu, Ping Ma, Qiao Xu, and Wei Li  »View Author Affiliations

Chinese Optics Letters, Vol. 1, Issue 6, pp. 340-342 (2003)

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The effect of ?/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 makes the coating damaged area protrudent and rough for HR coating without ?/2 silica overcoat, but concave and smooth for HR coating with ?/2 silica overcoat. The result of 10-on-1 multi-pulse irradiation on the same point of the coating shows that there is an energy density stage on the damage curve. If the laser energy density is within the range of the stage, HfO_(2)/SiO_(2) HR coatings with ?/2 silica overcoat will not be damaged more than 2 times for multi-shots, and the surface damages are very slight so that there is no impact on the coating performance. Another interesting result is that the energy density stage extends from the damage threshold to the point of about 3 times of threshold, which is similar to the effect of the laser condition on coating.

© 2005 Chinese Optics Letters

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(240.0310) Optics at surfaces : Thin films

Jianping Hu, Ping Ma, Qiao Xu, and Wei Li, "Effect of?/2 SiO_(2) overcoat on the laser damage of HfO_(2)/SiO_(2) high-reflector coatings," Chin. Opt. Lett. 1, 340-342 (2003)

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