Highly efficient THG in TiO2 nanolayers for third-order pulse characterization

Highly efficient THG in TiO2 nanolayers for third-order pulse characterization

Third harmonic generation (THG) of femtosecond laser pulses in sputtered nanocrystalline TiO2 thin films is investigated. Using layers of graded thickness, the dependence of THG on the film parameters is studied. The maximum THG signal is observed at a thickness of 180 nm. The corresponding conversi...

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Veröffentlicht in:Optics express 2011-08, Vol.19 (18), p.16985-16995
Hauptverfasser: Das, Susanta Kumar, Schwanke, Christoph, Pfuch, Andreas, Seeber, Wolfgang, Bock, Martin, Steinmeyer, Günter, Elsaesser, Thomas, Grunwald, Ruediger
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container_end_page 16995
container_issue 18
container_start_page 16985
container_title Optics express
container_volume 19
creator Das, Susanta Kumar
Schwanke, Christoph
Pfuch, Andreas
Seeber, Wolfgang
Bock, Martin
Steinmeyer, Günter
Elsaesser, Thomas
Grunwald, Ruediger
description Third harmonic generation (THG) of femtosecond laser pulses in sputtered nanocrystalline TiO2 thin films is investigated. Using layers of graded thickness, the dependence of THG on the film parameters is studied. The maximum THG signal is observed at a thickness of 180 nm. The corresponding conversion efficiency is 26 times larger compared to THG at the air-glass interface. For a demonstration of the capabilities of such a highly nonlinear material for pulse characterization, third-order autocorrelation and interferometric frequency-resolved optical gating (IFROG) traces are recorded with unamplified nanojoule pulses directly from a broadband femtosecond laser oscillator.
doi_str_mv 10.1364/OE.19.016985
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title Highly efficient THG in TiO2 nanolayers for third-order pulse characterization
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