Short-pulse laser device with a preferably passive mode coupling and multiple reflection telescope therefor

Abstract

The invention relates to a short-pulse laser device () with a preferably passive mode coupling. Said device comprises a resonator () which contains a laser crystal () in addition to several mirrors (M-M, OC) that define a long resonator arm () and a short resonator arm (), one (M) of said mirrors forming a pump beam coupling-in mirror and another (OC) forming a laser beam output coupler and comprising a multiple reflection telescope () that increases the length of the resonator and is allocated to the resonator arms (). Said telescope is constructed using mirrors (), in order to reflect a laser beam () that is coupled into the space between them back and forth several times, prior to being decoupled back into the other resonator, whereby sequential eccentric reflection points (to' to′) on the mirrors () are offset in relation to one another. The telescope () comprises only one curved mirror (), in addition to a planar mirror (), whose position corresponds at least substantially to the center (′) of an imaginary multiple reflection assembly comprising two curved mirrors (), whereby the one curved mirror () of the telescope () also contains the reflection points of the other imaginary curved mirror. The invention also relates to a multiple reflection telescope () for said device.