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Inhibition of Linear Absorption in Opaque Materials Using Phase-Locked Harmonic Generation

2008; American Physical Society; Volume: 101; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.101.113905

1092-0145

Marco Centini, V. Roppo, E. Fazio, Federico Pettazzi, C. Sibilia, Joseph W. Haus, John V. Foreman, Neşet Aközbek, Mark J. Bloemer, M. Scalora,

Solid State Laser Technologies

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.