Wide-time-range spectral-shearing interferometry
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Updated: Jun 21, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Hitoshi Tomita1, Hajime Nishioka
1Institute for Laser Science, the University of Electro-Communications Chofu, Tokyo 182-8585 Japan. tomita@ils.uec.ac.jp
Abstract:
A long-time-range spectral-shearing interferometry has been demonstrated by frequency mixing with two-color monochromatic fields. Strongly chirped pulses with quadratic and cubic phase distortion have been characterized. A linearly chirped pulse having 2.2 ps (full duration of 6 ps) has been measured with a coaxial two-color field generated by a narrow-gap passive etalon. Substantial extensions in the time range can be expected with a highly coherent two-color source, i.e., frequency stabilized lasers, or two longitudinal modes in the frequency comb.
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