S. Longhi, Experimental observation of spectral oscillations in frequency modulation laser operation - art. no. 047201, PHYS REV E, 6404(4), 2001, pp. 7201
The experimental observation of transient coherent oscillations in the opti
cal frequency spectrum of an Er-Yb solid-state laser with internal frequenc
y modulation (FM) is reported. These oscillations, which arise in the prese
nce of a slight detuning between the modulation frequency and the cavity ax
ial mode separation, are transiently observed when the modulator is switche
d on and appear as a damped breathing of laser spectral width superimposed
to the relaxation oscillation dynamics of the laser intensity. The experime
ntal results are in good agreement with the theoretical predictions which t
ake into account both the fast dynamics of spectral oscillations and the sl
ow dynamics of relaxation oscillations for the codoped Er-Yb laser system.