ATTENTION: This site is down for maintenance in read-only mode.

The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.

Simple Method to Measure the Coherence Time of a Mode-Locked Laser

Volume 46, Number 10 (Oct. 1992) Page 1464-1468

Iwata, Tetsuo; Hieftje, Gary M.

A simple method is described to measure the coherence time of a mode-locked pulse train. The temporal coherence function is obtained from an interference pattern produced by crossing the two laser pulses at a linear photodiode array (PDA) detector. Two wave-fronts generated from the same or from successive pulses are tilted with respect to each other and intersect the PDA at a small angle; the "visibility" of the resulting fringe pattern is then plotted as a function of the temporal offset between the interfering pulses. The coherence time of a mode-locked Ar+ laser (225 ps) and that of a synchronously pumped mode-locked dye laser (5.0 ps) have been measured.