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A novel laser structure in which a terraced substrate laser and a channeled substrate laser are connected is fabricated. The active layer of the composite cavity is twisted in the junction area between the two laser cavities. Internal reflection and polarization change occur in the twisted region. A built-in refractive index variation is formed by the terraced substrate and the channeled substrate structures. Remarkable characteristics of the laser are a low threshold current of 40 mA, a stable fundamental transverse-mode and single longitudinal-mode oscillation, and a wavelength locking over a temperature range of more than 6 °C.
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Sugino et al. (1983) studied this question.
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