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Transient Energy Transfer in ps Two‐Photon Absorption Experiments in CdTe at Room Temperature
Author(s) -
Rückmann I.,
Kornack J.,
Kolenda J.,
Petrauskas M.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221580237
Subject(s) - attenuation , absorption (acoustics) , beam (structure) , intensity (physics) , cadmium telluride photovoltaics , atomic physics , transient (computer programming) , free carrier absorption , materials science , coupling (piping) , two photon absorption , optics , chemistry , molecular physics , optoelectronics , physics , wavelength , laser , computer science , metallurgy , operating system
Abstract One‐beam transmission experiments and two‐beam‐coupling experiments with 35 ps‐pulses at 1.06 μm are performed in CdTe and CdTe: Ge to investigate (i) the nonlinear (two‐photon (TPA), free‐carrier and two‐step) absorption processes, (ii) their kinetics, and (iii) the transient energy transfer (TET) from stronger pump beam to the weaker probe beam, caused by coherent coupling which is observed around (with its maximum just before) zero delay. The competition between TPA and TET is demonstrated by oscillating intensity dependences of the probe‐beam transmittivity measured and calculated at small delays, which can be used to realize a continuous transition from optical beam amplification to attenuation at a fixed delay in dependence on the pump intensity only. The influence of the pump‐to‐probe intensity ratio on TET is discussed.