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
Original Manuscript: February 28, 1995
Published: July 15, 1995
Kazuhiko Misawa and Takayoshi Kobayashi, "Femtosecond Sagnac interferometer for phase spectroscopy," Opt. Lett. 20, 1550-1552 (1995)