HfO2/SiO2enhanced diamond turned aluminum mirrors for IR laser optics

Autor: Wang, Jue, Davis, Ronald W., Wang, Angela Q., Schreiber, Horst, Wilkinson, Scott J., Crifasi, Joseph C., Felock, Robert D.
Zdroj: Proceedings of SPIE; October 2011, Vol. 8190 Issue: 1 p819005-819005-10
Abstrakt: HfO2/SiO2multilayers were deposited on single point diamond turned aluminum substrates via modified reactive plasma ion assisted deposition to form a laser durable and environmentally stable dielectric enhanced IR mirror at a wavelength of 1064nm. The effect of the surface quality of the diamond turned aluminum on the optical performance of the dielectric enhanced mirror was assessed. A laser-induced damage threshold up to 11 J/cm2was obtained from the enhanced aluminum mirror tested in pulse mode at 1064nm with a pulse length of 20ns and a repetition rate of 20Hz. Laser damage morphology was revealed by a scanning electron microscopy. The damage mechanism was attributed to nodule defects generated by particle embedded on the aluminum substrate surface.
Databáze: Supplemental Index