Design and theoretical analysis of optical waveguides of quantum cascade laser at λ～ 9.5 μm
Abstract: We report the design and theoretical analysis of optical waveguides of the InP-based quantum cascade laser (QCL) operating at λ~ 9.5 μm. The effective refractive index, optical confinement and absorption coefficient are calculated by using the finite element method (FEM). From FEM simulations, the effect of the number of active/injector stages (Ns) on the optical confinement and waveguide loss of QCLs was investigated. As the Ns in QCLs increased from Ns = 30 to Ns = 70 for the 19 μm wide QCLs structure, the optical confinement was improved from 73.6 ％ to 90.6 ％ and the absorption coefficient was reduced from 3.91 cm-1 to 1.47 cm-1. However, the Ns should be optimized considering the heat generated within the active region because the increase in Ns causes a large voltage rise. The influence of ridge width on the optical confinement and absorption coefficient in QCLs with SiO2 and Si3N4 insulation layers was also studied.
(140.5965) Semiconductor lasers, quantum cascade (230.7370) Waveguides
Y. H. Ko B. D. Park J. S. Yu
Department of Electronic and Radio Engineering, Kyung Hee University, Yongin, 446-701 Korea
国际会议
上海
英文
1-2
2009-11-01（万方平台首次上网日期，不代表论文的发表时间）