INVESTIGADORES
REBON Lorena
artículos
Título:
Superbandwidth laser pulses in a dispersive medium: oscillating beyond the Fourier spectrum with unexpected propagation features
Autor/es:
ENRIQUE G. NEYRA; LAUREANO BULUS ROSSINI; FABIÁN VIDELA; LORENA REBÓN; PABLO A. CONSTANZO
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2024
ISSN:
1050-2947
Resumen:
The concept of superbandwidth refers to the fact that a band-limited signal can exhibit, locally,an increase of its bandwidth, i.e., an effective bandwidth greater than that predicted by its Fouriertransform. In this work, we study the propagation of superbandwidth laser pulses in a dispersivemedium, characterized by the group velocity dispersion. In particular, two important results arisefrom the analysis of the instantaneous frequency of the pulse obtained through the Wigner functiondistribution: First, it can be observed local oscillations of the electric field which are beyondthe Fourier spectrum of the incoming pulse. Second, for a range of values of the pulse synthesisparameters, surprisingly, the dynamics of the instantaneous frequency within certain temporal regions,corresponds to that of a pulse propagating in a medium with a group velocity dispersion ofopposite sign. This phenomenon is intrinsic to the special characteristics of the pulse and not tothe dispersive properties of the medium.
