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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.
- 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)
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
- 2015-05-18 05:56:17
- 2021-10-27 01:13:27
- 3 years ago