Optically pumped deep-ultraviolet (DUV) lasing with low threshold was demonstrated from AlGaN-based multiple-quantum-well (MQW) heterostructures grown on sapphire substrates. The epitaxial layers were grown pseudomorphically by metalorganic chemical vapor deposition on (0001) sapphire substrates. Stimulated emission was observed at wavelengths of 256 nm and 249 nm with thresholds of 61 kW/cm2 and 95 kW/cm2 at room temperature, respectively. The thresholds are comparable to the reported state-of-the-art AlGaN-based MQW DUV lasers grown on bulk AlN substrates emitting at 266 nm. These low thresholds are attributed to the optimization of active region and waveguide layer as well as the use of high-quality AlN/sapphire templates. The stimulated emission above threshold was dominated by transverse-electric polarization. This work demonstrates the potential candidacy of sapphire substrates for DUV diode lasers.
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- Low-Threshold Stimulated Emission at 249 nm and 256 nm From AlGaN-Based Multiple-Quantum-Well Lasers Grown on Sapphire Substrates
- Li, Xiao-Hang (Author)
- Detchprohm, Theeradetch (Author)
- Kao, Tsung-Ting (Author)
- Satter, Md. Mahbub (Author)
- Shen, Shyh-Chiang (Author)
- Yoder, P. Douglas (Author)
- Dupuis, Russell D. (Author)
- Wang, Shuo (Author)
- Wei, Yong (Author)
- Xie, Hongen (Author)
- Fischer, Alec M. (Author)
- Ponce, Fernando (Author)
- Wernicke, Tim (Author)
- Reich, Christoph (Author)
- Martens, Martin (Author)
- Kneissl, Michael (Author)
- College of Liberal Arts and Sciences (Contributor)
- Digital object identifier: 10.1063/1.4897527
- Identifier TypeInternational standard serial numberIdentifier Value0003-6951
- Identifier TypeInternational standard serial numberIdentifier Value1077-3118
- Copyright 2014 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 105, 14 (2014) and may be found at http://dx.doi.org/10.1063/1.4897527
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Li, Xiao-Hang, Detchprohm, Theeradetch, Kao, Tsung-Ting, Satter, Md. Mahbub, Shen, Shyh-Chiang, Yoder, P. Douglas, Dupuis, Russell D., Wang, Shuo, Wei, Yong O., Xie, Hongen, Fischer, Alec M., Ponce, Fernando A., Wernicke, Tim, Reich, Christoph, Martens, Martin, & Kneissl, Michael (2014). Low-threshold stimulated emission at 249 nm and 256 nm from AlGaN-based multiple-quantum-well lasers grown on sapphire substrates. APPLIED PHYSICS LETTERS, 105(14), 0-0. http://dx.doi.org/10.1063/1.4897527