MODE‐LOCKED QUIETING OF HE–NE AND ARGON LASERS

We report the suppression of low‐frequency noise in the He–Ne and argon lasers as a result of mode coupling by means of an internal phase modulator. Suppression of off‐axis modes and 20 to 30 dB of low‐frequency AM noise suppression have been obtained in both FM and phase‐locked operation, with no loss of output power.