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Ptychography, a phase retrieval method originally developed for crystallography [1], was recently adapted from real space imaging to the temporal domain for the characterization of ultrashort laser pulses [2]. Since then, several time-domain ptychography (TDP) pulse characterization schemes have been proposed and demonstrated, bearing experimental similarities, e.g., to second-harmonic frequency-resolved...
Multiphoton absorption induced ultraviolet luminescence in ZnO nanorods is investigated with interferometric frequency-resolved optical gating. Power dependency exponents between 3 and 4 are extracted, consistent with simulations using Keldysh theory showing three-photon and four-photon absorption.
We demonstrate experimental evidence for non-instantaneous polarization decay in dielectrics. The few-femtosecond relaxation times agree favorable with solutions of the time-dependent Schrödinger equation and relate to resonances of the quantum mechanical dipole.
We present direct experimental evidence for a non-instantaneous nonlinear response in TiO2. An asymmetry in interferometric FROG measurements indicates a relaxation time constant of about 5 fs.
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