Abstract

We demonstrate a highly sensitive real-time optical pulse characterization technique based on differential chronocyclic tomography. The spectral intensity and phase of the pulse under test are reconstructed analytically from two experimental traces measured simultaneously in the spectral domain. The high sensitivity and accuracy are made possible by lock-in detection of the differential spectra in the simplified chronocyclic tomography. An accuracy of $\sim 0.04\mathrm{rad}$ of spectral phase recovery is achieved with a $10\text{-}\mathrm{Hz}$ refresh rate and $10\text{-}\mu \mathrm{W}$ sensitivity. We also show that the measurement technique is applicable to pulses as short as $\sim 100\mathrm{fs}$.

© 2005 Optical Society of America

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