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(a) Design values for the spatial distribution of the Al content and doping level of three different types (A–C) of DB SCH heterostructures. (b) Theoretically predicted optical mode profiles for these three designs.
NPC line scans in the direction perpendicular to the junction for the diode lasers a (dotted line), b (solid line), and c (dashed line) recorded for different excitation wavelengths: (a) , (b) , (c) , (d) , (e) , and (f) .
(a) Fourier transform of the theoretical mode profile of design A and maximum spatial frequency probed in the NPC experiments. [(b)–(d)] Simulated profiles (solid lines), calculated from truncated Fourier transforms of the theoretical mode profiles for designs A–C compared to the experimental NPC mode profiles (circles) of the devices a–c, respectively. All NPC scans were recorded at an excitation wavelength of .
FWHM beam divergences calculated (i) for the as-designed theoretical near-field distributions and (ii) from the experimental NPC traces compared to experimentally measured beam divergences (FWHM) for a series of diode lasers from the DB SCH heterostructures A–C.
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