Ultraviolet diode laser system based on the resonant optical feedback method with the capability of fast continuous sweep

摘要

An ultraviolet laser diode system stabilized to an external Fabry-Perot cavity by using the resonant optical feedback method is described. Both wide continuous sweep with fast response and drift compensation for long term operation are realized simultaneously by performing feedforward control along with feedback control of the system parameters. By utilizing the capability of synchronized sweep realized by the feedforward control, the modulation of the output frequency, due to dither for lock-in feedback control of the system parameters, is almost perfectly canceled. The method described here is useful for developing diode laser systems for practical use with such features as small short term fluctuation, long-term operability and fast continuous sweep.