Modeling of current spreading in high-power broad-area lasers and its impact on the lateral far field divergence
- Zeghuzi, Anissa
- Radziunas, Mindaugas
- Wenzel, Hans
- Wünsche, Hans-Jürgen
- Bandelow, Uwe
- Knigge, Andrea
2010 Mathematics Subject Classification
- 78A60 35Q60 78M34 78-04
2008 Physics and Astronomy Classification Scheme
- 42.55.Px 02.30.Jr 02.60.Lj
- High-power diode laser, current spreading, current modeling, lateral far-field
The effect of current spreading on the lateral far-field divergence of high-power broad-area lasers is investigated with a time-dependent model using different descriptions for the injection of carriers into the active region. Most simulation tools simply assume a spatially constant injection current density below the contact stripe and a vanishing current density beside. Within the drift-diffusion approach, however, the injected current density is obtained from the gradient of the quasi-Fermi potential of the holes, which solves a Laplace equation in the p-doped region if recombination is neglected. We compare an approximate solution of the Laplace equation with the exact solution and show that for the exact solution the highest far-field divergence is obtained. We conclude that an advanced modeling of the profiles of the injection current densities is necessary for a correct description of far-field blooming in broad-area lasers.
- Proceedings of ``SPIE Photonics West 2018'', San Francisco, USA, 21.01.2018 - 01.02.2018, B. Witzigmann, M. Osiński, Y. Arakawa, eds., vol. 10526 of Proceedings of SPIE, SPIE Digital Library, Bellingham, 2018, pp. 10526/1--10526/10, DOI 10.1117/12.2289803 .