LASER SYSTEM

1. A laser device with an emission in the 1.5 mu m region, comprising : a) a giant impulse laser (1 to 5), the resonator of which has a medium which can be activated by a pump light source, b) a Raman resonator (13) having a Raman-active medium which is arranged in a cavity bounded by an inlet window and an outlet window and can be activated by a beam of the giant impulse laser, which beam is focussed by means of focussing elements, and c) a mirror (12) which is dichroic with respect to the giant impulse laser and Raman wavelength and is arranged optically behind the Raman resonator (13), viewed in the direction of the beam, characterised in that d) the resonator of the giant impulse laser (1 to 5) produces a polarized beam, e) a directional isolator (6, 7) is arranged between the giant impulse laser (1 to 5) and the Raman resonator (13), the isolator being composed of a thin film polarizer (6) inserted in the Brewster angle in the path of the beam and a lambda/4 wave plate (7) directed perpendicularly to the path of the beam, f) the path of the beam is deflected before or after the directional isolator (6, 7) in a direction opposite to the starting direction, and g) the dichroic mirror (12) is adjusted so that the incident remainder of the beam of the giant impulse laser is deflected in such a manner (19) that it can no longer enter the Raman resonator (13).