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Two-photon absorption and Kerr coefficients of silicon for 850–2200 nm

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3 Author(s)
Bristow, A.D. ; Department of Physics and Institute for Optical Sciences, University of Toronto, Toronto M5S-1A7, Canada ; Rotenberg, N. ; van Driel, H.M.

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The degenerate two-photon absorption coefficient β and Kerr nonlinearity n2 are measured for bulk Si at 300 K using 200 fs pulses with carrier wavelength of 850≪λ≪2200 nm for which indirect gap transitions occur. With a broad peak near the indirect gap and maximum value of 2±0.5 cm/GW, the dispersion of β compares favorably with theoretical calculations of Garcia and Kalyanaraman [J. Phys. B 39, 2737 (2006)]. Within our wavelength range, n2 varies by a factor of 4 with a peak value of 1.2×10-13 cm2/W at λ=1800 nm.

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Applied Physics Letters  (Volume:90 ,  Issue: 19 )