THREE-PHASE SPECTRAL INTERFEROMETRY WITH IMPROVED SIGNAL RETRIEVAL
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United States of America Patent
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Issued Date -
May 16, 2024
app pub date -
Nov 30, 2023
filing date -
Oct 17, 2022
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Abstract
Methods, systems and devices are described that enable measurement and characterization of complex laser pulses by relying on three interferograms that are measured simultaneously. The described three-phase spectral interferometry (3PSI) can meet the growing demand for optical recorders with long record and 1 ps or finer resolution. These techniques leverage various calibration and signal retrieval operations that allow improved system performance. An example method for determining characteristics of an input optical signal includes measuring the spectra associated with three interferograms produced at outputs of a three-by-three optical splitter, and determining an amplitude and a phase value of the input optical signal using those measurements and the results of a calibration procedure that characterizes point spread functions across multiple spectrometers and determines corrections factors for the spectrometers.
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