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

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The laser source has a resonant cavity (1) including a partially reflecting output side (2), a reflecting side (3), and an active material (4). The resonant cavity includes an optical path covered by light pulses, from a solid laser pump source, where the length is greater than preset length, such that energy of the light pulses is greater than 100 nano joules. The optical path includes a passage in the active material.