Ultra-short laser source with rare earth ions and stable...

H - Electricity – 01 – S

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H01S 3/13 (2006.01)

Patent

CA 2554470

The invention relates to an ultra-short laser source with rare earth ions, comprising a resonant cavity (1) having a first partially-reflective output face (2) and a second reflective face (3). The inventive source also comprises a first active material (4) which receives a pump light flux (6) that is emitted by a first solid laser pump source (7). According to the invention, the optical path length of the resonant cavity (1), which is travelled by the aforementioned pulses, is greater than 7.5 m, such that the energy E¿L? per pulse is greater than 100 nJ, said optical path comprising at least one passage in the active material (4). In addition, the ultra-short laser source comprises means for lengthening the resonant cavity (1), which can be used to extend the optical path length travelled by the light pulses in the resonant cavity (1) of a compact laser source. Moreover, the propagation matrix ABCD of the resonant cavity (1) is similar to the unit matrix, such that the characteristics of the light beam travelling to and fro in the resonant cavity (1) are unchanged.

L~invention concerne une source laser ultrabrève à ions terre rare comportant une cavité résonante (1) ayant une première face de sortie (2) partiellement réfléchissante et une deuxième face réfléchissante (3). Cette source comprend également un premier matériau actif (4). Ce premier matériau (4) reçoit un flux lumineux de pompe (6) émis par une première source de pompe laser (7) solide. Selon l~invention, la cavité résonante (1) présente une longueur de chemin optique parcourue par lesdites impulsions supérieure à 7,5 m de sorte que l~énergie EL par impulsion soit supérieure à 100 nJ, ledit chemin optique comprenant au moins un passage dans ledit matériau actif (4) et la source laser ultrabrève comprend des moyens pour allonger la cavité résonante (1) permettant d~étendre la longueur de chemin optique parcouru par lesdites impulsions lumineuses dans la cavité résonante (1) d~une source laser compacte, la matrice ABCD de propagation de ladite cavité résonante (1) étant proche de la matrice unitaire de sorte que les caractéristiques du faisceau lumineux effectuant des allers-retours dans la cavité résonante (1) sont inchangées.

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