Terraced-heterostructure large-optical-cavity AlGaAs diode laser: A new type of high-power cw single-mode device

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Abstract
A new terraced lateral wave confining structure is obtained by liquid phase epitaxy over channeled substrates misoriented perpendicular to the channels’ direction. Single spatial and longitudinal mode cw operation is achieved to 50 mW from one facet, in large spot sizes (2×7.5 μm, 1/e2 points in intensity) and narrow beams (6°×23°, full width half-power). At 70 °C ambient temperature cw lasing is obtained to 15 mW from one facet. Weak mode confinement in an asymmetric lateral waveguide provides discrimination against high-order mode oscillation.