H. Wenzel, J. Fricke, A. Maaßdorf, N. Ammouri, C. Zink, D. Martin, and A. Knigge
Electron. Lett., vol. 58, no. 3, pp. 121-123, doi:10.1049/ell2.12366 (2022).
We present a multi-active-region bipolar-cascade distributed-Bragg reflector (DBR) laser emitting around 910 nm. The three active regions and two tunnel junctions are located in a single waveguide core sharing the same third-order vertical mode. A slope efficiency of 2.25 W/A was measured with a threshold current density of 400 A/cm2. Due to the implemented 7th Bragg order surface grating, the laser exhibits a narrow optical spectrum with a width of 0.3 nm and a thermal detuning of 60 pm/K.
Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
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