Mid-infrared nonlinear optical response of Si-Ge waveguides with ultra-short optical pulses
Carletti, L.; Sinobad, M.; Ma, Pan; Yu, Yi; Allioux, David; Orobtchouk, Regis; Brun, M.; Ortiz, S.; Labeye, P.; Hartmann, Jean-Michel; Nicoletti, S.; Madden, Steve; Luther-Davies, Barry; Moss, D. J.; Monat, C.; Grillet, C.
We characterize the nonlinear optical response of low loss Si0.6Ge0.4 / Si waveguides in the mid-infrared between 3.3 μm and 4 μm using femtosecond optical pulses. We estimate the three and four-photon absorption coefficients as well as the Kerr nonlinear refractive index from the experimental measurements. The effect of multiphoton absorption on the optical nonlinear Kerr response is evaluated and the nonlinear figure of merit estimated providing some guidelines for designing nonlinear optical...[Show more]
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