Frequency locking and quasiperiodicity in a modulated external cavity injection laser

Abstract

We report the observation of frequency locking and quasiperiodicity in a modulated external cavity injection laser. The order of appearance of the frequency-locked regions follows a Farey sequence as the modulation frequency is scanned at a fixed value of the modulation depth. Quasiperiodic behavior is observed when the modulation frequency is incommensurate with the external cavity round-trip frequency. The observed behavior is found to be in good agreement with a rate equation model.