二重制御方式によるメタン安定化レーザー

抄録

To improve the stability of a frequency stabilized laser, a double servo system consisting of a slow response loop and a fast response loop was designed, constructed and experimentally studied. In the faster response region, the phase lag of the servo system was mainly governed by the loop gain and the time constant of the fast response loop. This behavior was advantageously utilized in compensating the phase lag introduced by the integration element and, accordingly, in giving faster response to the total system.
Frequency fluctuation of the laser in 1-10 Hz region was analyzed using the power spectrum density. The frequency variation, thus estimated, was smaller than several parts in 10¹¹.