We report interband cascade lasers operating in a single spectral mode at . A corrugated pattern etched into both sidewalls of the 6- and -wide ridges serves to suppress higher-order lateral modes by increasing their loss, and also provides a fourth-order distributed-feedback grating for longitudinal mode selection. Despite the grating’s weak coupling strength, the ridge produced up to 12 mW per facet of single-mode cw output power at , with a side-mode suppression ratio of .
© 2009 American Institute of Physics.
2009
American Institute of Physics
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