Nonlinear optical response of low loss silicon germanium waveguides in the mid-infrared
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Date
Authors
Carletti, L.
Ma, Pan
Yu, Yi
Luther-Davies, Barry
Hudson, D.
Monat, C.
Orobtchouk, R.
Madden, Stephen
Moss, D. J.
Brun, M.
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Optical Society of America
Abstract
We have investigated the nonlinear optical response of low loss Si(0.6)Ge(0.4) / Si waveguides in the mid-infrared wavelength range from 3.25- 4.75μm using picosecond optical pulses. We observed and measured the three and four-photon absorption coefficients as well as the Kerr nonlinear refractive index. The dynamics of the spectral broadening suggests that, in addition to multiphoton absorption, the corresponding higher order nonlinear refractive phenomena also needs to be included when high optical pulse intensities are used at mid-infrared wavelengths in this material.
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Keywords
Nonlinear optics, Integrated optics, Materials, Integrated optics devices, Guided waves, Infrared, BiCMOS technology, Laser pulses, Multiphoton processes, Refractive index, Silicon, Waveguides, Mid-infrared wavelength ranges, Multi-photon absorption, Nonlinear refractive index, Optical pulse intensity, Photon absorptions, Spectral broadening
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Source
Optics express