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 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.
Centini
Marco
M
Dipartimento di Energetica, University of Rome La Sapienza, Via Scarpa 16, Rome, Italy.
Roppo
Vito
V
Fazio
Eugenio
E
Pettazzi
Federico
F
Sibilia
Concita
C
Haus
Joseph W
JW
Foreman
John V
JV
Akozbek
Neset
N
Bloemer
Mark J
MJ
Scalora
Michael
M