Laser resonator

Patent Granted PROBLEM TO BE SOLVED: To provide a cylindrically symmetric polarized laser resonator which is stable for a variation of position of an optical element, and whose polarized state is independent to an exciting power. ; SOLUTION: The laser resonator is constructed so that only a specified cylindrically-symmetric polarized component is a stable resonance condition using a crystal of double refraction as only one optical element composing a resonator.