Patent ID: 7756189
Filing Date: 2010-07-13
Classification: G03F,H01L,H01S

Abstract:
1. A two-light flux interference exposure device, comprising: a laser resonator that includes: the two-light flux interference exposure device further includes: a first Neutral Density (ND) filter that adjusts a light intensity of the third laser light to a first light intensity; a beam splitter that divides the third laser light into a first light flux and a second light flux, with the first light flux substantially orthogonal to the second light flux; the first light flux is reflected from the beam splitter with the first light intensity; the second light flux is passed through the beam splitter, which increases the light intensity of the second light flux to a second light intensity; the second light intensity of the second light flux is adjusted by a second ND filter to substantially commensurate with the first light intensity, resulting in sharp interference fringes; an interference optic system causing the first and second light fluxes to interfere with each other and impinge on a light extraction surface of a semiconductor exposed to the two light flux interferences for a duration; with the light extraction surface of the semiconductor oriented at different angles for various exposure durations to the two light flux interferences to form multiple, overlapping sets of overlaying layers of patterns on the light extraction surface of the semiconductor, resulting in formation of a final pattern with sections that have overlapping, multiple levels of exposure to the two light flux interferences; with the final pattern processed to constitute a periodic corrugated structure surface that reduces differences between refraction factor of air and the light extraction surface of the semiconductor, resulting in an efficient extraction of light by substantial reduction in reflection thereof.