LASER AMPLIFIER AND LASER DEVICE, AS WELL AS EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM

摘要

The purpose of the present invention is to suppress propagation of light of a wavelength to be suppressed that is different from a desired wavelength. The present invention may be provided with: a chamber which houses a laser medium; a first window which is provided on the chamber, and which causes laser light of a desired wavelength from the outside to be incident to the interior of the chamber; an excitation apparatus which amplifies the laser light incident to the interior of the chamber by exciting the laser medium; a second window which is provided on the chamber, and which outputs the laser light that has been amplified by the excitation apparatus to the outside of the chamber; a mirror which is disposed on a laser optical path between the first window and the second window; and a wavelength-selective film which is disposed on the first window and/or the second window and/or the mirror, and which suppresses propagation of light of a wavelength to be suppressed that is different from the desired wavelength.