Abstract

We use a new version of a sigmameter, the two-channel field-widened rf sigmameter, to map optical frequency into the phase of an rf signal. This enables us to lock the laser frequency on the interferometer by using a phase-locked loop (PLL). Controlling the reference phase of the PLL electronically, we are able to scan the laser frequency over a long range step by step or with substeps.

© 1986 Optical Society of America