In this study laser diodes with different InGaN quantum well thickness up to 25 nm are analyzed. For those devices efficient screening of the piezoelectric field and operation on excited states was reported. We observe the time-dependent behavior of the intensity and emission spectrum below threshod operation, which can give insights about the QW tilt and the wave function overlap. In particular we observe a strong rise in intensity and a wavelength shift at the trailing edge of the pulse. Furthermore, we investigate the laser operation of the different quantum well width diodes showing unusual spectral-temporal behavior especially for the wide QW devices.
KEYWORDS: Near field, Semiconductor lasers, Streak cameras, Visible radiation, Spectroscopy, Diodes, Spectral resolution, Near field optics, Broad area laser diodes
We investigate the lateral near field of blue laser diodes with 10 μm broad ridges in pulsed conditions. While scanning the near field step by step with the help of a streak camera, we observe complex dynamics due to lateral-longitudinal mode competition, wavelength shifts and lateral mode switching. Additionally, a high-resolution spectrometer enables us to differentiate between the different mode combs which form the longitudinal mode spectrum. We observe filling of the gain volume and a spectral broadening with increasing current, as well as a slight asymmetry and an inhomogeneous lateral mode pattern.
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