Gain Characteristics of Optically Pumped UVC Lasers with Wide AlGaN Single-Quantum-Well Active Regions
Cardinali G, Kölle S, Schulz A, Susilo N, Hauer Vidal D, Guttmann M, Blonski MA, Römer F, Witzigmann B, Nippert F, Wagner MR, Wernicke T, Kneissl M (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Abstract
Herein, the lasing threshold and gain characteristics of ultraviolet-C optically pumped edge-emitting lasers with thick single-quantum-well (SQW) active regions are investigated by the variable-stripe length method. Positive net modal gain is observed in lasers with AlGaN-based SQWs with thicknesses up to 12 nm. The lasers show a reduction of the threshold power density with increasing SQW thickness, with the lowest threshold of 1.3 MW cm−2 achieved for a 9 nm SQW laser. The high gain and low threshold in lasers with thick quantum wells are attributed to lasing from excited states, where the polarization fields are screened by the carriers in the fundamental state and the barriers, thus recovering larger electron and hole wavefunctions overlap. These findings are supported by k · p simulations, and for a 9 nm SQW, the calculation predicts a contribution of the fundamental transition to the gain of 75% for non-resonant optical excitation and below 1% for resonant optical or electrical excitation.
Authors with CRIS profile
Sebastian Kölle
Professur für Optoelektronik
Friedhard Römer
Professur für Optoelektronik
Bernd Witzigmann
Professur für Optoelektronik
Involved external institutions
Germany (DE)How to cite
APA:
Cardinali, G., Kölle, S., Schulz, A., Susilo, N., Hauer Vidal, D., Guttmann, M.,... Kneissl, M. (2024). Gain Characteristics of Optically Pumped UVC Lasers with Wide AlGaN Single-Quantum-Well Active Regions. physica status solidi (a). https://dx.doi.org/10.1002/pssa.202400067
MLA:
Cardinali, Giulia, et al. "Gain Characteristics of Optically Pumped UVC Lasers with Wide AlGaN Single-Quantum-Well Active Regions." physica status solidi (a) (2024).
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