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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.
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O’Gorman et al. (1989) studied this question.
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