Mr. Eduardo Nava Palomares Profile

Eduardo Nava Palomares

at Centro de Investigaciones en Óptica AC

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Proceedings Article | 29 September 2011 Paper

Physical processes behind a Ti:Sa femtosecond oscillator

M. Fernández-Guasti, E. Nava, F. Acosta, C. Roychoudhuri

Proceedings Volume 8121, 812118 (2011) https://doi.org/10.1117/12.893116

KEYWORDS: Oscillators, Mode locking, Superposition, Femtosecond phenomena, Picosecond phenomena, Prisms, Sensors, Spectroscopy, Streak cameras, Time metrology

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The sharply peaked comb structure that arises from a mode-locked cavity is usually explained in terms of the superposition of monochromatic waves with integer wavelength multiples of the round trip of the cavity. However, the non interaction (or non interference) of waves implies that these wave-fields cannot sum themselves to reorganize either their amplitudes or their energies. The summation has to be carried out either by a nonlinear medium whose output involves the wave-mixing and/or it is performed by the detector. The output of a femtosecond Titanium Sapphire oscillator is analyzed with the above mentioned framework in mind. The spectrum is obtained in mode-locked and non mode-locked operation via a grating spectrometer for different cavity detunnings. The time dependence is measured via a fast photo-diode to record the repetition rate. A frequency resolved optical gating (FROG) device is used to resolve the temporal shape of the femtosecond pulses. The data is examined from two viewpoints: The superposition process is carried out (a) by the filed amplitudes themselves, or (b) by some interacting material dipoles.

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