We compensated for chirp of optical pulses with an over-one-octave bandwidth (495–1090 nm; center wavelength of 655.4 nm) produced by self-phase modulation in a single argon-filled hollow fiber and generated 3.4-fs, 1.56 optical-cycle pulses (500 nJ, 1-kHz repetition rate). This was achieved with a feedback system combined with only one 4-<i>f</i> phase compensator with a spatial light modulator and a significantly improved phase characterizer based on modified spectral phase interferometry for direct electric-field reconstruction. To the best of our knowledge, this is the shortest pulse in the visible-to-infrared region.
© 2003 Optical Society of America
Keisaku Yamane, Zhigang Zhang, Kazuhiko Oka, Ryuji Morita, Mikio Yamashita, and Akira Suguro, "Optical pulse compression to 3.4fs in the monocycle region by feedback phase compensation," Opt. Lett. 28, 2258-2260 (2003)