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