Group-velocity control by quadratic nonlinear interactions |
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Authors: | Marangoni Marco Manzoni Cristian Ramponi Roberta Cerullo Giulio Baronio Fabio De Angelis Costantino Kitamura Kenji |
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Institution: | Dipartimento di Fisica, Politecnico di Milano, ULTRAS-CNR-INFM, IFN-CNR, Piazza L. Da Vinci 32, I-20133 Milan, Italy. marco.marangoni@polimi.it |
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Abstract: | We give direct experimental evidence that the group velocity of ultrashort pulses can be controlled through chi(2)-cascaded interactions, under the condition of large group-velocity mismatch. The group velocity can be finely tuned by acting on pulse intensity and phase mismatch. Group-delay shifts up to 50 fs are achieved by propagating 40 fs pulses around 1400 nm in a 25 mm long periodically poled stoichiometric lithium tantalate crystal. |
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