Abstract

We developed a novel femtosecond Sagnac interferometer that enables us to take single-shot measurements of both the difference transmission and the difference phase spectra. Owing to the excellent stability of the Sagnac interferometer, a difference phase spectrum was obtained with a high phase change sensitivity of ~λ/100 after a 1000-shot accumulation. The spectral range, wavelength, and time resolution were 530– 650 nm, 1 nm, and 200 fs, respectively.

© 1995 Optical Society of America

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