Frequency shifts of optical pulses can be achieved exploiting propagation in nonlinear crystals. Spectral blue-shifts and red-shifts, originating from a phase-mismatched second harmonic generation process under conditions of strong group-velocity mismatch, can be efficiently controlled by acting on pulse intensity and phase-mismatch. We show theoretically and experimentally that spectral blue-shifts and spectral red-shifts in a range of 100 nm are achieved by propagating 40 fs pulses with a 70 nm spectrum centered at 1450 nm in a 25-mm-long periodically poled stoichiometric lithium tantalate crystal. This crystal can be exploited for the realization of a single-pass device that tunes the carrier frequency output from a femtosecond fiber laser with continuity and over a broad range.
Dispositivi ottici per il controllo spettrale dei segnali / F. Baronio; C. De Angelis; G. Sanna; P. Bassi; C. Manzoni; M. Marangoni; R. Ramponi; G. Cerullo. - ELETTRONICO. - (2006), pp. 564-567. (Intervento presentato al convegno XVI Riunione Nazionale di Elettromagnetismo, RiNEm 2006 tenutosi a Genova nel 18-21 settembre 2006).
Dispositivi ottici per il controllo spettrale dei segnali
SANNA, GUIDO;BASSI, PAOLO;
2006
Abstract
Frequency shifts of optical pulses can be achieved exploiting propagation in nonlinear crystals. Spectral blue-shifts and red-shifts, originating from a phase-mismatched second harmonic generation process under conditions of strong group-velocity mismatch, can be efficiently controlled by acting on pulse intensity and phase-mismatch. We show theoretically and experimentally that spectral blue-shifts and spectral red-shifts in a range of 100 nm are achieved by propagating 40 fs pulses with a 70 nm spectrum centered at 1450 nm in a 25-mm-long periodically poled stoichiometric lithium tantalate crystal. This crystal can be exploited for the realization of a single-pass device that tunes the carrier frequency output from a femtosecond fiber laser with continuity and over a broad range.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.