Laser generator

Laser generator comprising:

• an optical resonant cavity of the folded type, limited by two plane mirrors, a first totally reflecting mirror and a second partly transparent mirror;
• an active material arranged inside said cavity;
• means for exciting that active material, suitable for generating an oscillating radiation in said cavity, a part of the radiation being able to emerge from said cavity through said second mirror to form a laser beam;
• characterized in that said two plane mirrors are arranged side by side substantially in the same plane and are fixed on the same support, the reflecting faces of those mirrors being situated on the same side of that plane and in that said generator comprises a corner cube reflector arranged to send back, by successive reflections on the faces of that reflector, the radiation coming from one of said two plane mirrors towards the other mirror;
• and
• means for deviating, in said cavity, said radiation through a small predetermined angle, said means for deviating comprising two optical prisms crossed successively from one to the other by said radiation, one face of one of those prisms being adjacent to one face of the other prism, said prisms being relatively rotatable with respect to each other about a common axis which intersects the faces of said two prisms and which is substantially parallel to said radiation.