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(Color online) (a) Schematic picture and (b) scanning electron microscope image of a tapered quantum cascade laser. The ridge waveguide section of shown here expands with an angle of 1.9° to an output facet of with a total etching depth of about . The minimum required etching depth is .
(Color online) Output power vs current density at room temperature of a tapered laser with an wide RWG section, and a wide output facet and an wide RWG. The inset shows an emission spectrum of the device at room temperature.
(Color online) Measured horizontal beam divergence intensity scan of a wide RWG and a tapered quantum cascade laser . The tapered device shows an improved far field FWHM angle of only 8° compared to a RWG device of width, having a FWHM angle of .
(Color online) Horizontal far field intensity scans of three tapered laser devices with varied tapered angles .
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