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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 4,
  • Issue 2,
  • pp. 119-121
  • (2006)

A moisture-resistant antireflective coating by sol-gel process for neodymium-doped phosphate laser glass

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Abstract

Using methyl triethoxysilicane as precursor, a moisture-resistant coating for neodymium-doped laser glass was developed by the sol-gel process. Colloidal silica was added in coating solution as modifier. The refractive index of this coating varied from 1.31 to 1.42. A porous antireflective (AR) silica coating with the index of 1.27 was coated on the moisture-resistant coating surface. The two-layer coating possessed transmission up to 99.1% at wavelength of 966 nm, surface root-mean-square (RMS) roughness of 1.245 nm, and roughness of average (RA) of 0.961 nm. In the case of laser of 1053-nm laser wavelength and 1-ns pulse duration, the damage threshold of the two-layer coatings was more than 15 J/cm2.

© 2005 Chinese Optics Letters

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