ULTRA-SHORT LASER SOURCE WITH RARE EARTH IONS AND STABLE PULSE TRAIN AND DEVICE FOR LENGTHENING A LA

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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 EL 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.