METHOD AND APPARATUS FOR THE DETERMINATION OF THE RELATIVE FREQUENCY OFFSET BETWEEN AN INPUT OPTICAL SIGNAL AND A RESONANCE FREQUENCY OF AN OPTICAL CAVITY

摘要

A method and apparatus for stabilizing the relative frequency offset between a laser and a resonant optical cavity is described. Detected spatial mode patterns excited in a coupled nearly confocal resonator are used to derive a correction signal for frequency offset. The method can be applied to stabilizing a diode-cavity pathlength for an optical feedback locked diode laser system.