Patent ID: 6697162
Filing Date: 2004-02-24
Classification: G01B

Abstract:
A laser interference apparatus comprising:a body base; a slider disposed movably on said body base and fixing thereon an object to be processed; a laser interferometer having an interferometer portion for forming a variable length optical path of laser light extending on said body base in a moving direction of said slider and a fixed reflecting mirror for forming a reference optical path of the laser light extending on said body base in the moving direction of said slider, so as to measure an amount of movement of said slider by using interference of the laser light between said reference optical path and said variable-length optical path; and means for processing the object using as a reference the amount of movement of said slider which is identified by said laser interferometer, and a processing point that is disposed on an extension of an optical axis of said laser interferometer, wherein said means for processing is fixed on said body base, and said fixed reflecting mirror is fixed on said body base so as to be located at a same position as the processing point in the moving direction of said slider.