| 摘要 |
The invention relates to a short-pulse laser device (11) with a preferably passive mode coupling. Said device comprises a resonator (12), which contain s a laser crystal (14) in addition to several mirrors (M1-M7, OC) that define a long resonator arm (17) and a short resonator arm (16), one (M1) 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 (18 ) that increases the length of the resonator and is allocated to the resonator arms (16, 17). Said telescope is constructed using mirrors (25, 26), in orde r to reflect a laser beam (15) that is coupled into the space between them bac k and forth several times, prior to being decoupled back into the other resonator, whereby sequential eccentric reflection points (1 to 8; 1' to 8') on the mirrors (25, 26) are offset in relation to one another. The telescope (18) comprises only one curved mirror (26), in addition to a planar mirror (25), whose position corresponds at least substantially to the centre (25') of an imaginary multiple reflection assembly comprising two curved mirrors (26a , 26b), whereby the one curved mirror (26) of the telescope (18) also contains the reflection points of the other imaginary curved mirror. The invention al so relates to a multiple reflection telescope (18) for said device.
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