The first continuous wave (cw) operation at room temperature of a GaAlAs short-wavelength distributed feedback (DFB) laser is reported. The cw operation at a wavelength of 759 nm was realized by use of the buried twin-ridge substrate (BTRS) structure which has an excellent current confinement efficiency in the active region. The hybrid liquid phase epitaxy and the metalorganic chemical vapor deposition growth technology were used for the fabrication of short-wavelength GaAlAs DFB BTRS lasers.
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Takigawa et al. (1987) studied this question.
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