Patent ID: 8135053

Claim:
A laser crystal device for short pulse lasers, comprising a container, whose interior is sealed in relation to the environment, and which includes windows which are attached to side walls for the passage of laser radiation which passes through a laser crystal in operation, the windows being situated tilted by the Brewster's angle to the beam path of the laser radiation, and being located at a sufficiently large distance, with respect to the laser beam properties, from the position of the laser crystal at which the beam cross-section of the windows is sufficiently large in order to ensure a lower peak intensity at the windows in comparison to the peak intensity of the laser radiation at the laser crystal, to prevent degeneration processes at the windows, and a mounting for the laser crystal being attached in the interior of the container, wherein the windows are situated tilted relative to one another by twice the Brewster's angle in two side walls which are arranged at an angle to one another, of the container, and in that the container contains a technically pure atmosphere.