Abstract
A correlation method for accurate measurement of ultrafast optical pulses of femtosecond resolution is presented. It uses a lock-in amplifier and a variable mixing method of reference frequencies in a Michelson interferometer. The read-out system consists of an X-Y plotter or a computer monitor. This technique does not require high-speed photodetectors but is sufficiently sensitive to plot femtosecond pulses at low optical power level (about 10 mu W average power). The measurement of 320 fs FWHM light pulses from an actively mode-locked semiconductor laser and a contrast ratio of 80 were demonstrated. The resolution of this technique is believed to be a few femtoseconds.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have