Patent ID: 6288831
Filing Date: 2001-09-11
Classification: G02F

Abstract:
A laser modulating optical system, comprising:a multiple line laser source that emits at a plurality of peak wavelengths;an acoustooptic modulator that changes a direction of an emergent beam by diffraction caused by input ultrasonic wave, said acoustooptic modulator taking out a diffracted beam as a modulated beam; anda correction optical system for correcting deviation between optical paths of at least two laser components of different peak wavelength due to a variation of the diffraction angle of said acoustooptic modulator, said correction optical system comprising at least one pair of chromatic dispersing elements located at a position where the laser beam becomes parallel and in at least one of incident and exit sides of said acoustooptic modulator;wherein each of said chromatic dispersing elements has a predetermined chromatic dispersion and has no lens power.