標題: Lasing Behavior, Gain Property, and Strong Coupling Effects in GaN-Based Vertical-Cavity Surface-Emitting Lasers
作者: Lu, Tien-Chang
Chu, Jung-Tang
Chen, Shih-Wei
Cheng, Bo-Siao
Kuo, Hao-Chung
Wang, Shing-Chung
光電工程學系
Department of Photonics
關鍵字: InGaN;vertical-cavity surface-emitting lasers;gain;polariton
公開日期: 1-Aug-2008
摘要: The optical properties of a GaN-based vertical-cavity surface-emitting laser (VCSEL) with two dielectric distributed Bragg reflectors were investigated under optically pumped operation. The laser emits blue-violet light at a wavelength of 414 nm at room temperature with a high spontaneous emission coupling factor (beta-factor) of 2 x 10(-2) and a linewidth of 0.25 nm. The optical gain was determined by the Hakki-Paoli method by measuring the photoluminescence spectra below threshold conditions. At room temperature, an optical gain of 2900 cm(-1) was obtained under threshold condition. The linewidth enhancement factor (alpha-factor) is estimated front the ratio of the wavelength and gain derivation with respect to the carrier density, and the alpha-factor at room temperature is estimated to be 2.8. Strong exciton-photon coupling in the microcavity was observed at room temperature. A 9 meV Rabi splitting with 60% peak-to-valley contrast was determined from the photoluminescence measurements. Emission spectra showing the evolution of anticrossing behavior were also observed.
URI: http://dx.doi.org/10.1143/JJAP.47.6655
http://hdl.handle.net/11536/29109
ISSN: 0021-4922
DOI: 10.1143/JJAP.47.6655
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 47
Issue: 8
起始頁: 6655
結束頁: 6659
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