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We demonstrate InGaN violet light-emitting superluminescent diodes with large spectral width suitable for applications in optical coherence spectroscopy.This was achieved using the concept of nonlinear indium content profile along the superluminescent diode waveguide.A specially designed 3D substrate surface shape leads to a step-like indium content profile,with the indium concentration in the InGaN/GaN quantum wells ranging approximately between 6% and 10%.Thanks to this approach,we were able to increase the width of the spectrum in processed devices from 2.6 nm(reference diode)to 15.5 nm.
We demonstrate InGaN violet light-emitting superluminescent diodes with large spectral width suitable for applications in optical coherence spectroscopy. This was achieved using the concept of nonlinear indium content profile along the superluminescent diode waveguide. A specially designed 3D substrate surface shape leads to a step- like indium content profile, with the indium concentration in the InGaN / GaN quantum wells, ranging between about 6% and 10%. Thanks to this approach, we were able to increase the width of the spectrum in processed devices from 2.6 nm (reference diode) to 15.5 nm.