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Study of few-optical-cycles generation of high-order harmonics

Published online by Cambridge University Press:  30 July 2001

P. VILLORESI
Affiliation:
INFM, Dipartimento di Elettronica e Informatica, Università di Padova, Padova, Italy
P. BARBIERO
Affiliation:
INFM, Dipartimento di Elettronica e Informatica, Università di Padova, Padova, Italy
L. POLETTO
Affiliation:
INFM, Dipartimento di Elettronica e Informatica, Università di Padova, Padova, Italy
M. NISOLI
Affiliation:
INFM, Dipartimento di Fisica, Politecnico, Milano, Italy
G. CERULLO
Affiliation:
INFM, Dipartimento di Fisica, Politecnico, Milano, Italy
E. PRIORI
Affiliation:
INFM, Dipartimento di Fisica, Politecnico, Milano, Italy
S. STAGIRA
Affiliation:
INFM, Dipartimento di Fisica, Politecnico, Milano, Italy
C. DE LISIO
Affiliation:
INFM, Dipartimento di Scienze Fisiche, Università di Napoli, Napoli, Italy
R. BRUZZESE
Affiliation:
INFM, Dipartimento di Scienze Fisiche, Università di Napoli, Napoli, Italy
C. ALTUCCI
Affiliation:
INFM, Dipartimento di Chimica, Università della Basilicata, Potenza, Italy

Abstract

The high-order harmonic generation process was studied using laser pump pulses of different duration, down to 7 fs. The time profile of this kind of pulse corresponds to a few optical cycles at the fundamental frequency, and therefore a cycle-to-cycle variation of the maximum amplitude occurs. These facts violate the adiabatic approximation of the generation process, giving rise to new aspects of the physical process. The comparison of results with pulses in the two regimes are reported and discussed. The modeling of the complete generation and propagation process in three dimensions is also presented.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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