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Nonlinear refractive dynamics of CS2 are measured with the beam deflection technique. A response function model is fit, from which the pulse width dependent n2,eff is calculated and compared to Z-scan measurements.
Using extremely nondegenerate photons in frequency (energy ratios >10/1), we measure 2–4 orders of magnitude enhancement of two-photon absorption in semiconductors compared to the degenerate case. We demonstrate sub-femtosecond gated detection directly on semiconductor diodes.
We performed frequency non-degenerate pump-probe experiments in several direct-gap semiconductors using femtosecond and picosecond pulses. Tuning the long wavelength photons in the IR region, we observed a 125-fold enhancement of the two-photon absorption coefficient.
Förster resonance energy transfer from a two-photon absorber to a photochromic spirooxazine are investigated by one- and two-photon absorption. Upon energy transfer, fluorescence of the donor is quenched while that of the photochromic is enhanced.
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