High laser-damage threshold and low-cost sol-gel-coated epoxy-replicated mirrors

Herve G. Floch; Michel Berger; Marc Novaro; Ian M. Thomas

doi:10.1117/12.57216

1 June 1991 High laser-damage threshold and low-cost sol-gel-coated epoxy-replicated mirrors

Herve G. Floch, Michel Berger, Marc Novaro, Ian M. Thomas

Proceedings Volume 1441, Laser-Induced Damage in Optical Materials: 1990; (1991) https://doi.org/10.1117/12.57216
Event: Laser-Induced Damage in Optical Materials: 1990, 1990, Boulder, CO, United States

Abstract

In a collaborative effort with some french industrial and university laboratories and also in contact with our colleagues from the Lawrence Livermore National Laboratory (LLNL), we have developed at Limeil-Valenton National Laboratory (LVNL) various laser-performant and inexpensive dielectric mirrors made of a resin-replicated substrate and a specific colloidal sol-gel coating. To date, we have obtained 8" to 12" diameter molded optical surfaces with a flatness as good as A./10 peak to valley at 633-nm wavelength with a roughness ranging 10-15 A RMS. We have been able to acheive coatingreflectivity exceeding 99 % using room temperature spin-coating deposition of alternate silica and alumina quarterwave layers, and conserving the original substrate flatness. Such sol-gel coated replicated mirrors averaged 13.5 i/cm2 in a single shot irradiation mode and 15.1 i/cm2 with a laser-annealing procedure at 1064-nm and with 3-ns pulses. The present cost of such a product is about 4-6 times cheaper than a similar component conventionally e-beam coated.

Citation Download Citation

Herve G. Floch, Michel Berger, Marc Novaro, and Ian M. Thomas "High laser-damage threshold and low-cost sol-gel-coated epoxy-replicated mirrors", Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); https://doi.org/10.1117/12.57216

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