Two-layer broadband antireflective coating prepared from methyl silicone and porous silica

Ian M. Thomas

doi:10.1117/12.284123

2 October 1997 Two-layer broadband antireflective coating prepared from methyl silicone and porous silica

Ian M. Thomas

Proceedings Volume 3136, Sol-Gel Optics IV; (1997) https://doi.org/10.1117/12.284123
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Single layer quarterwave antireflective (AR) coatings are widely used on many of the transmissive optics in high power fusion lasers. With these coatings maximum efficiency is only obtained at one wavelength. In those applications involving harmonic converter crystals, however, broader band performance would be advantageous because light of two wavelengths is involved. A simple two layer broadband coating has been developed which consists of a layer of a methyl silicone polymer overcoated with porous silica. This is prepared from methyltriethoxysilane and tetraethyl silicate, respectively. Both reagents are distilled to the highest purity so that the coatings are non-absorptive and have the highest laser damage threshold. Less than 0.5% reflection over a broad wavelength range can be obtained on substrates in the 1.46 to 1.51 index range.

Citation Download Citation

Ian M. Thomas "Two-layer broadband antireflective coating prepared from methyl silicone and porous silica", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); https://doi.org/10.1117/12.284123

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