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-mu m-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.
Inhibition of linear absorption in opaque materials using phase-locked harmonic generation / Centini, Marco; V., Roppo; Fazio, Eugenio; Pettazzi, Federico; Sibilia, Concetta; J. W., Haus; J. V., Foreman; N., Akozbek; M. J., Bloemer; M., Scalora. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 101:(2008), pp. 113905 -1-113905 -4. [10.1103/PhysRevLett.101.113905]
Inhibition of linear absorption in opaque materials using phase-locked harmonic generation
CENTINI, MARCO;FAZIO, Eugenio;PETTAZZI, Federico;SIBILIA, Concetta;
2008
Abstract
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-mu m-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
