Patent ID: 8982323
Filing Date: 2015-03-17
Classification: G03F

Abstract:
1. A light generating apparatus comprising: a light source emitting a light beam; a beam expander that enlarges and collimates the light beam; an optical shutter configured to selectively transmit a light beam coming from the beam expander to form at least two non-diffracted light beams; and a focusing lens focusing the at least two light beams on a same location such that the at least two light beams interfere with each other to form a diffraction grating pattern on the location, and wherein the optical shutter includes a plurality of pixels such that the optical shutter selectively transmits a light beam according to an on/off control, wherein the on/off control operates on a pixel-by-pixel basis and is configured to form at least two optical openings in the optical shutter such that the light beam coming from the beam expander is selectively transmitted through the openings, the at least two openings being separated by at least one pixel from each other, and wherein the on/off control adjusts at least one of wherein a period and a direction of the diffraction grating pattern are controlled according to only the on/off control of the optical shutter.