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Updated: Jul 19, 2026

An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
Published on: February 16, 2024
Complete chirp analysis of a gain-switched pulse using an interferometric two-photon absorption autocorrelation
Sang Hoon Chin1, Young Jae Kim, Ho Seong Song
1Department of Information and Communications, Gwanju Institute of Science and Technology, Gwangju, South Korea.
Abstract:
We propose a simple but powerful scheme for the complete analysis of the frequency chirp of a gain-switched optical pulse using a fringe-resolved interferometric two-photon absorption autocorrelator. A frequency chirp imposed on the gain-switched pulse from a laser diode was retrieved from both the intensity autocorrelation trace and the envelope of the second-harmonic interference fringe pattern. To verify the accuracy of the proposed phase retrieval method, we have performed an optical pulse compression experiment by using dispersion-compensating fibers with different lengths. We have obtained close agreement by less than a 1% error between the compressed pulse widths and numerically calculated pulse widths.
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