Laser system

Abstract

A laser system includes a laser device configured to output pulse laser light, and a first optical pulse stretcher including a delay optical path for stretching a pulse width of the pulse laser light. The first optical pulse stretcher is configured to change a beam waist position of circulation light that circulates through the delay optical path and is output therefrom, in an optical path axis direction according to a circulation count. When the circulation light is condensed by an ideal lens, a light condensing position of the circulation light is changed in the optical path axis direction according to the circulation count.

Dependencies are inferred from the claim text.