Affiliation:
1. Institute of Physics Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany
2. Institute of High Pressure Physics Polish Academy of Sciences Sokołowska 29 01‐142 Warszawa Poland
Abstract
In nitride‐based laser diodes, the poor conductivity of the p‐type region, higher light absorption, and the difficult processing of an ohmic p‐contact with low resistance are major challenges. Recently interband tunnel junctions (TJs) have been used to replace much of the hole transport layers by electron transport layers, and also to allow for two n‐type contacts. In this work, GaN‐based laser diode stacks with TJs are analyzed. The devices are grown with plasma‐assisted molecular beam epitaxy and include two waveguides with active regions consisting of 25 nm wide InGaN quantum well (QW), each, which are connected through a TJ. A second TJ is placed on top to eliminate the p‐type contact. In this study, the time‐dependent spectral behavior of such structures is analyzed by streak camera measurements. The two QWs have different lasing thresholds and emission wavelength. Using the temporal resolution of the streak camera, a lasing onset of the second QW a few nanoseconds after the first one is observed. Single shot measurements show unusual intensity oscillations from both QWs, however, one is stable and the other laser diode (LD) has irregular oscillations.
Reference33 articles.
1. S.Gerhard L.Nähle B.Jentzsch H.König E.Reiger U.Heine S.Tautz C.Eichler G.Brüderl T.Wurm D.Borovac M.Behringer L.Kreiner M.Jama N.von Malm A.Balck M.Baumann V.Krause inProc. SPIE OPTO Vol.12421 San Francisco CA March2023 p.124210G.
2. Blue and Green Low Threshold Laser Diodes With InAlN Claddings
3. Recent progress in high-power blue-violet lasers
4. A 271.8 nm deep-ultraviolet laser diode for room temperature operation