Abstract
Femtosecond pump pulses are strongly attenuated in lithium niobate owing to two-photon absorption; the relevant nonlinear coefficient ranges from for to for . In collinear pump–probe experiments the probe transmission at the double pump wavelength is controlled by two different processes: A direct absorption process involving pump and probe photons leads to a pronounced short-duration transmission dip, whereas the probe absorption by pump-excited charge carriers results in a long-duration plateau. Coherent pump–probe interactions are of no importance. Hot-carrier relaxation occurs on the time scale of .
© 2005 Optical Society of America
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