We demonstrate GaAs-based superluminescent diodes (SLDs) incorporating a window-like back facet in a self-aligned
stripe. SLDs are realised with low spectral modulation depth (SMD) at high power spectral density, without application
of anti-reflection coatings. Such application of a window-like facet reduces effective facet reflectivity in a broadband
manner. We demonstrate 30mW output power in a narrow bandwidth with only 5% SMD, outline the design criteria for
high power and low SMD, and describe the deviation from a linear dependence of SMD on output power as a result of
Joule heating in SLDs under continuous wave current injection. Furthermore, SLDs processed normal to the facet
demonstrate output powers as high as 20mW, offering improvements in beam quality, ease of packaging and use of real
estate.
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