TUBULAR STRAIGHT SLAB TYPE GAS LASER

PROBLEM TO BE SOLVED: To provide a slab type gas laser generating a high quality laser beam having an intensity distribution approximate to Gaussian distribution on the cross-section of an outputted laser beam. SOLUTION: Two tubular electrodes 11, 12 having different diameters are arranged concentrically through a spacer 13 to form a tubular straight slab 1 filled with a laser medium between two tubular electrodes 11, 12. A ring-like trick mirror M1 is disposed at one end part of the straight slab 1, an output mirror M2 passing one part of a light beam and reflecting the other part of the light beam is disposed in the center at one end part of the straight slab 1, and a double action mirror M3 is disposed at the other end part of the straight slab 1. A relation xm