TWO-MODE FREQUENCY STABILIZATION OF AN INTERNAL MIRROR 633NM HE-NE LASER

摘要

A Commercial He-Ne laser was stabilized to about 1 x 10~(-9) for a two hour measurements and a frequency resettability of about 8.4 x 10~(-9) for three months of measurements. The stabilization process depends on the two-mode frequency method using the power difference between the two orthogonal linearly polarized modes of the laser as an error signal. A simple and inexpensive feedback circuit has been used to control the heater current, wrapped around the laser cavity to keep the difference in power between the two modes at constant value.