Teoria para espectroscopia direta com pente de frequÃncias

AUTOR(ES)

Carlos EliÃcer EstupiÃÃn LÃpez

DATA DE PUBLICAÇÃO

2008

RESUMO

In recent years, the stabilization of the frequency comb generated by a femtosecond laser resulted in a revolution in the field of high precision spectroscopy. Such frequency combs consist of millions of equally-spaced frequency modes in modelocking spanning tens of nanometers. Usually, for applications in optical metrology, a cw diode laser is phase locked to the frequency comb and then used to probe the sample. In 2004, on the other hand, it was proposed a new method of spectroscopy, called Direct Frequency Comb Spectroscopy (DFCS), which employs only the train of pulses of the femtosecond laser. This method allows a direct measurement, in the same run of the experiment, of several transition frequencies separated by tens or even hundreds of nanometers, with precision comparable to the best cw lasers. In this thesis, we will describe the theory behind DFCS, its development and general implementation for any class of pulses and relative detuning. This theory will be applied to the Rubidium 87 atom, considering its multi-level structure, and comparing with some results obtained up to now in the literature, which still can be explained using a quite simplified version of the developed theory. The generalization of the theory for DFCS, presented in this thesis, can lead to the development of a new class of spectroscopic techniques that incorporates many concepts and methods developed in the last two decades in the field of coherent control.

ASSUNTO(S)

fisica spectroscopy time and frequency metrology femtosecond lasers espectroscopia lasers de femtossegundos metrologia de tempo e freqÃÃncia

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