A new room-temperature deposition technique for optical coatings |
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Authors: | P F Belleville H G Floch |
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Institution: | (1) CEA-Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve-Saint-Georges Cedex, France |
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Abstract: | We describe a new coating method Laminar Flow Coating (LFC) technique developed to obtain highly reflective (HR) laser damage resistant sol-gel multidielectric coatings. Such coatings are used in high-power lasers for inertial confinement fusion experiments (ICF). This technique uses substrates in an upside-down position and a travelling wave of coating solution is transported with a laminar motion under the substrate surface with a tubular dispense unit. This creates a thin-film coating by solvent evaporation. Satisfactory results have been obtained on 20-cm square glass substrates regarding the optical performances, the thickness uniformity, the edge-effects and the laser damage resistance. This deposition technique combines the advantages of both classical techniques: the non-exclusive substrate geometry such as in dip-coating and the small solution consumption such as in spin-coating.The association of sol-gel colloidal suspensions and LFC coating process has been demonstrated as a promising way to produce inexpensive specific optical coatings 1]. |
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Keywords: | deposition technique room-temperature process optical coatings colloidal solutions laser damage threshold |
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