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- W2028804963 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. Ein-Strahl-Transmissionsexperimente und Zwei-Strahl-Kopplungsexperimente mit 35 ps-Impulsen bei 1,06 μm werden in CdTe und CdTe: Ge durchgeführt, um (i) die nichtlinearen Absorptionsprozesse (Zwei-Photon-Absorption (TPA), freie Trägerabsorption und Zwei-Stufen-Absorption), (ii) ihre Zeitabhängigkeiten und (iii) den transienten Energietransfer (TET) vom intensiven Pumpstrahl in den Probenstrahl, der durch kohärente Kopplung hervorgerufen und dessen Maximum zeitlich kurz vor der Verzögerung Δt = 0 beobachtet wird, zu untersuchen. Die Konkurrenz zwishen TPA und TET zeigt sich in oszillierenden Intensitätsabhängigkeiten der Probenstrahltransmission, die im Bereich kleiner Verzögerungen gemessen und berechnet werden und die benutzt werden können, um bei fester Verzögerung einen kontinuierlichen Übergang von optischer Verstärkung zur Dämpfung nur in Abhaängigkeit von der Pumpintensität zu realisieren. Der Einfluß des Intensitätsverhältnisses von Pump-zu Teststrahl auf den TET wird diskutiert." @default.
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- W2028804963 date "1990-04-01" @default.
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- W2028804963 title "Transient Energy Transfer in ps Two-Photon Absorption Experiments in CdTe at Room Temperature" @default.
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- W2028804963 doi "https://doi.org/10.1002/pssb.2221580237" @default.
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