LASER RESONATOR WITH PARASITIC MODE SUPPRESSION

摘要

A resonator for a laser 201 comprises a first resonator wall 203a; a second resonator wall 205a that is separated from the first resonator wall in a transverse direction thereby defining a gap 206 between the first and second resonator walls; a lasing medium disposed in the gap; a first mirror 207 disposed at a first end of the first and second resonator walls; a second mirror 209 disposed at a second end of the first and second resonator walls, wherein the first and second mirror cooperate to fold an intra-cavity laser beam along a plurality of paths through the lasing medium, wherein the plurality of paths define a boundary of a superfluous region within the resonator, wherein the intra-cavity laser beam does not pass through the superfluous region; wherein the first mirror and the second mirror forms a laser resonator for a parasitic laser mode, a portion of which is located within the superfluous region; a parasitic mode suppressor that is located within the superfluous region of the resonator and is disposed between the first end of the first resonator wall and the first mirror.