Analysis of a single pulse of light through a Fabry-P\'{e}rot interferometer

We present a method of analyzing the output of a single pulse of light from a Fabry-P\'{e}rot interferometer. Together with an independent measurement of the pulsewidth the analysis enables the determination of the linewidth, time-bandwidth product, and consequently the degree of coherence of the pulses. The method presented is ideal for light pulses longer than a picosecond where analysis with a FROG is difficult. The analysis presented builds on the method presented by Marzenell, Beigang, and Wallenstein by analyzing the ring pattern of the Fabry-P\'{e}rot interferometer. S. Marzenell, R. Beigang, R. Wallenstein, Appl. Phys. B \textbf{71}, 185 -- 191 (2000).