Jpn. J. Appl. Phys. 47 (2008) pp. 6655-6659  |Previous Article| |Next Article|  |Table of Contents|
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Lasing Behavior, Gain Property, and Strong Coupling Effects in GaN-Based Vertical-Cavity Surface-Emitting Lasers

Tien-Chang Lu, Jung-Tang Chu, Shih-Wei Chen, Bo-Siao Cheng, Hao-Chung Kuo, and Shing-Chung Wang

(Received February 18, 2008; accepted June 6, 2008; published online August 22, 2008)

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 (β-factor) of 2 ×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 (α-factor) is estimated from the ratio of the wavelength and gain derivation with respect to the carrier density, and the α-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.

URL: http://jjap.jsap.jp/link?JJAP/47/6655/
DOI: 10.1143/JJAP.47.6655

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