Laser-bandwidth-induced fluctuations in the intensity transmitted by a Fabry-Pérot interferometer.

We have measured the power spectrum of the intensity Auctuations of light transmitted by a Fabry-Perot interferometer when the input field is the real Gaussian field. The real Gaussian field is a field characterized by real, random (Gaussian) amplitude Auctuations. The bandwidth of the real Gaussian field was varied, taking on values less than that of the interferometer, as well as greater. Comparisons of the measured spectra with calculated spectra are quite satisfactory. Of special interest is a feature in the spectra centered at the laser-interferometer detuning frequency.