Inhibition of linear absorption in opaque materials using phase-locked harmonic generation

We theoretically predict and experimentally demonstrate inhibition of linear absorption for phase and group velocity mismatched second- and third-harmonic generation in strongly absorbing materials, GaAs, in particular, at frequencies above the absorption edge. A 100-fs pump pulse tuned to 1300 nm g...

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Bibliographic Details
Published in:Physical review letters 2008-09, Vol.101 (11), p.113905-113905, Article 113905
Main Authors: Centini, Marco, Roppo, Vito, Fazio, Eugenio, Pettazzi, Federico, Sibilia, Concita, Haus, Joseph W, Foreman, John V, Akozbek, Neset, Bloemer, Mark J, Scalora, Michael
Format: Article
Language:English
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Summary:We theoretically predict and experimentally demonstrate inhibition of linear absorption for phase and group velocity mismatched second- and third-harmonic generation in strongly absorbing materials, GaAs, in particular, at frequencies above the absorption edge. A 100-fs pump pulse tuned to 1300 nm generates 650 and 435 nm second- and third-harmonic pulses that propagate across a 450-microm-thick GaAs substrate without being absorbed. We attribute this to a phase-locking mechanism that causes the pump to trap the harmonics and to impress on them its dispersive properties.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.113905