Mr. Zhian Jin Profile

Zhian Jin

at Lehigh Univ

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Proceedings Article | 28 February 2006 Paper

Novel approach for efficient mid-infrared coherent emitters based on continuously phase-matched 'W' optical waveguide

Zhian Jin, Nelson Tansu

Proceedings Volume 6115, 61151V (2006) https://doi.org/10.1117/12.646114

KEYWORDS: Mid-IR, Waveguides, Refractive index, Cladding, Aluminum, Gallium, Wave propagation, Gallium arsenide, Heterojunctions, Phase matching

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A novel 'W' optical waveguide using AlGaAs-GaAs semiconductor material systems is presented and analyzed for achieving a continuously-phase-matched difference frequency generation (DFG) nonlinear process. Our approach utilizes two near-IR lasers to obtain an efficient generation of coherent mid-IR radiation. By maintaining a continuous phase matching condition in our 'W'-waveguide, our studies show that nonlinear DFG process obtained from 920-nm and 1140-nm lasers with input powers at 0.5 Watts (with interaction length of 5-mm) results in coherent continuouswave (CW) power of ~ 0.13 mW at wavelength of 4.77-μm. The normalized conversion efficiency (η_nor) of the DFG process is ~ 40 W^-1m^-2, as a result of low spatial mode overlap. An optimized 'W' waveguide consisting of large index contrast core region structure, with an improved spatial mode overlap of the near and mid-IR modes, allows a significant improvement in the normalized conversion efficiency by up to approximately two orders of magnitude (η_nor > ~ 104 W^-1m^-2).

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