EXPERIMENTAL INVESTIGATIONS OF AN EQUIDIS TANT MODE DISTRIBUTION AND OF INTERMODE BEAT STABILIZATION VIA THE DISCHARGE CURRENT IN AN HE-NE NE LASER WITH FULL SELF-MODE-LOCKING/

An experimental investigation was made of the extent to which the mode distribution was equidistant in an He-Ne laser with a neon absorption cell and full self-mode-locking. A method was developed for stabilisa tion of the intermode frequency of this laser with self-mode-locking b y phase locking to the frequency of an external oscillator via the dis charge current. The stability of the pulse repetition (intermode) freq uency was governed by stability of the frequency of an external rf sta ndard. An analysis was made of the feasibility of using lasers with se lf-mode-locking stabilised at the intermode frequency as secondary sta ndards of length utilising a Raman oscillator.