Short pulse laser device with preferably passive...

H - Electricity – 01 – S

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H01S 3/098 (2006.01) G02B 17/08 (2006.01)

Patent

CA 2485643

The invention relates to a short-pulse laser device (11) with a preferably passive mode coupling. Said device comprises a resonator (12), which contains 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 order to reflect a laser beam (15) 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 (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 also relates to a multiple reflection telescope (18) for said device.

L'invention concerne un dispositif laser à impulsions courtes (11) présentant de préférence un couplage de modes passif. Ce dispositif comprend : un résonateur (12) contenant un cristal laser (14) ainsi que plusieurs miroirs (M1-M7, OC) qui définissent un bras de résonateur long (17) et un bras de résonateur court (16), un (M1) de ces miroirs formant un miroir d'injection de rayonnement de pompage et un autre (OC) de ces miroirs constituant un miroir d'extraction de rayonnement laser ; ainsi qu'un télescope à réflexion multiple (18) qui est associé aux bras de résonateur (16, 17) et sert à agrandir les longueurs de résonateur. Ce télescope est constitué de miroirs (25, 26) qui lui permettent de réfléchir un rayonnement laser (15) injecté dans l'espace séparant ces miroirs, plusieurs fois en avant et en arrière entre lesdits miroirs, avant son extraction vers le résonateur restant, des points de réflexion excentrés successifs (1 à 8 ; 1' à 8') sur les miroirs (25, 26) étant décalés les uns par rapport aux autres. Ce télescope (18) comprend par ailleurs un seul miroir courbe (26) ainsi qu'un miroir plan (25) situé au moins sensiblement au milieu (25') d'un ensemble de réflexion multiple imaginaire comprenant deux miroirs courbes (26a, 26b), ledit miroir courbe (26) du télescope (18) comportant également les points de réflexion de cet autre miroir courbe imaginaire. L'invention se rapporte en outre à un télescope à réflexion multiple (18) correspondant.

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