Method for protection of adhesives used to secure optics from ultra-violet light
View Patent ↗A method for reducing the scattered light emitted through an optical element is provided that protects adhesive used to hold the optical element in place from light induced deterioration. In one embodiment, the method includes applying a thin coating of an organoxy metallic compound to a region on an optical element where adhesive will be applied and exposing the organoxy metallic compound to ultra-violet light. Exposure to ultra-violet light converts the organoxy metallic compound to its corresponding metal oxide forming an optically inert, light absorbing coating that protects adhesive used to hold the optical element in place from light induced deterioration.
1. A method for protecting an adhesive, which is used to secure an optical element, from light emitted through an edge of the optical element, comprising:
coating an organoxy metallic compound to the edge of the optical element;
exposing the organoxy metallic compound to ultra-violet light to convert the organoxy metallic compound to a corresponding metal oxide;
applying the adhesive to the corresponding metal oxide; and
securing the optical element by using the adhesive covering the corresponding metal oxide to secure the optical element to an optical mount within a photolithographic optical system, whereby the coating protects the adhesive used to hold the optical element in place from light induced deterioration.
2. The method of claim 1 , wherein the organoxy metallic compound is an organo-titanium compound.
3. The method of claim 1 , wherein said coating step comprises coating the edge of the optical element using an optical applicator cloth or spin-coating the organoxy metallic compound onto the edges of the optical element.
4. The method of claim 1 , wherein a thickness of the coating ranges from about one nanometer to not more than about two hundred micrometers.