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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