We investigate theoretically the tuning characteristics of a diode with an external grating cavity for which one of the external-cavity modes and the peak of the grating reflection scan synchronously. We show that the tuning curve is hysteretic. Moreover, the theoretical analysis reveals that frequencies at turning points of the hysteretic tuning curve are related to the external cavity mode spacing, the reflectivity of the front facet, and the linewidth enhancement factor α of the laser diode. A method for achieving an overlap of the peak of the reflection profile of the grating with one of the external-cavity modes is described. Experimentally, by measuring the hysteretic tuning curve, we observed the predicted effect and found the reflectivity of the front facet and the α value for a Toshiba TOLD 9215 visible diode to be 2.9 ± 1.6% and 5.1 ∓ 1.3, respectively.
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Yan et al. (1992) studied this question.
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