We demonstrate transverse-magnetic (TM) dominant deep-ultraviolet (DUV) stimulated emission from photo-pumped AlGaN multiple-quantum-well lasers grown pseudomorphically on an AlN/sapphire template by means of photoluminescence at room temperature. The TM-dominant stimulated emission was observed at wavelengths of 239, 242, and 243 nm with low thresholds of 280, 250, and 290 kW/cm[superscript 2], respectively. In particular, the lasing wavelength of 239 nm is shorter compared to other reports for AlGaN lasers grown on foreign substrates including sapphire and SiC. The peak wavelength difference between the transverse-electric (TE)-polarized emission and TM-polarized emission was approximately zero for the lasers in this study, indicating the crossover of crystal-field split-off hole and heavy-hole valence bands. The rapid variation of polarization between TE- and TM-dominance versus the change in lasing wavelength from 243 to 249 nm can be attributed to a dramatic change in the TE-to-TM gain coefficient ratio for the sapphire-based DUV lasers in the vicinity of TE-TM switch.
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- Demonstration of Transverse-Magnetic Deep-Ultraviolet Stimulated Emission From AlGaN Multiple-Quantum-Well Lasers Grown on a Sapphire Substrate
- Li, Xiao-Hang (Author)
- Kao, Tsung-Ting (Author)
- Satter, Md. Mahbub (Author)
- Wei, Yong (Author)
- Wang, Shuo (Author)
- Xie, Hongen (Author)
- Shen, Shyh-Chiang (Author)
- Yoder, P. Douglas (Author)
- Fischer, Alec M. (Author)
- Ponce, Fernando (Author)
- Detchprohm, Theeradetch (Author)
- Dupuis, Russell D. (Author)
- College of Liberal Arts and Sciences (Contributor)
- Digital object identifier: 10.1063/1.4906590
- Identifier TypeInternational standard serial numberIdentifier Value0003-6951
- Identifier TypeInternational standard serial numberIdentifier Value1077-3118
- Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. along with the following message: The following article appeared in APPLIED PHYSICS LETTERS 106 (2015) and may be found at http://dx.doi.org/10.1063/1.4906590
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Li, Xiao-Hang, Kao, Tsung-Ting, Satter, Md. Mahbub, Wei, Yong O., Wang, Shuo, Xie, Hongen, Shen, Shyh-Chiang, Yoder, P. Douglas, Fischer, Alec M., Ponce, Fernando A., Detchprohm, Theeradetch, & Dupuis, Russell D. (2015). Demonstration of transverse-magnetic deep-ultraviolet stimulated emission from AlGaN multiple-quantum-well lasers grown on a sapphire substrate. APPLIED PHYSICS LETTERS, 106, 041115. http://dx.doi.org/10.1063/1.4906590