Patent ID: 8187775
Filing Date: 2012-05-29
Classification: G03F

Abstract:
1. A method of making a high resolution photomask comprising: providing a photomask substrate having a first major surface and a second major surface, the photomask substrate being sensitive to light within a first wavelength range and is initially transparent to light within a second wavelength range that is utilized for product exposure operations required to pattern a product through the photomask; exposing select regions of the first major surface of the photomask to light from a light source having light in at least the first wavelength range so as to selectively photodarken regions of the photomask substrate according to a desired pattern, the photodarkened regions darkened sufficient to block light within the second wavelength range; and providing a filter associated with the second major surface of the photomask substrate, the filter for: allowing light within the second wavelength range to pass through; and performing at least one of: inhibiting and reducing the rate at which, light within at least the first wavelength range, which is directed towards the second major surface, causes photodarkening of the photomask substrate.