Laser light source, method of laser oscillation, and method of laser processing

摘要

A laser light source includes a light source section for outputting pulse laser light lambda₁, lambda₂ with a mutually identical repetition frequency, an optical amplification section for amplifying and outputting the pulse laser light lambda₁, lambda₂ output from the above light source section by means of a common optical amplification medium, an optical demultiplexing section for mutually demultiplexing pulse laser light lambda₁, lambda₂, an optical multiplexing section for multiplexing and outputting the pulse laser light lambda₁, lambda₂ demultiplexed in the above optical demultiplexing section, and an optical path length difference setting section for adjusting an optical path length difference between the pulse laser light lambda₁, lambda₂ in between the optical demultiplexing section and the optical multiplexing section.