a compact solid - state laser has its cavity formed by the reflection surface of a gain crystal and the reflection surface of a chirped mirror . pumping light is incident to the cavity through the reflection surface of the gain crystal or the chirped mirror , from which the laser output is led out . forming of the cavity solely by the gain crystal and chirped mirror enables the elimination of additional component parts for the compensation of dispersion , thereby making the entire laser system compact , and consequently permitting an increase in the repetition frequency .