Patent ID: 8767292
Filing Date: 2014-07-01
Classification: H01S

Abstract:
1. A laser apparatus, comprising: a light-emitting device outputting light to be amplified; an optical branching device inputting the light to be amplified from the light-emitting device and separating the light to be amplified into plural beams; plural final-stage optical amplifiers respectively inputting the plural beams separated by the branching device and individually amplifying the plural beams inputted; plural beam emitting ends individually receiving the plural beams respectively amplified by the plural final-stage optical amplifiers and respectively outputting the plural beams received; an intermediate optical amplifier disposed on an optical path between the light-emitting device and the branching device; and a bandpass filter disposed on an optical path between the intermediate optical amplifier and the branching device, wherein output power of a pumping light source in the intermediate optical amplifier is set so that each power of the beams inputted to the final-stage optical amplifiers becomes constant without depending on a variation in the number of the final-stage optical amplifiers.