Apparatus and method for spatial mode selection of planar waveguide and thin slab lasers in the large cross section size direction

摘要

A method and apparatus for spatial mode selection of planar waveguide and thin slab lasers in the laser's large cross section size direction. The planar laser has a small cross section size direction orthogonal to a major axis thereof and a large cross section size direction orthogonal to the small cross section size direction and to the major axis. A planar reflector is disposed at one end of the planar laser, the planar reflector having a reflecting surface which is arranged orthogonally to the major axis and parallel to both the small and large cross section size directions of the laser. A Bragg grating is disposed in the optical track of the laser, the Bragg grating having a grating vector which is arranged in the plane normal to said small cross section size direction and at the angle between 0° and 90° to said large cross section size direction for suppression of higher order optical modes in said large cross section size direction.