We report on coherent synthesis of two ultra-broadband optical parametric amplifiers, each compressed by chirped mirror pairs, resulting in almost-octave-spanning (520–1000 nm) spectra supporting nearly single-cycle sub-4 fs pulse duration. Synthesized pulse timing is locked to less than 30 as by a balanced optical cross-correlator. The synthesized pulse is characterized by two-dimensional spectral interferometry and has a 3.8 fs duration.
© 2012 Optical Society of America
Original Manuscript: January 25, 2012
Revised Manuscript: March 14, 2012
Manuscript Accepted: March 18, 2012
Published: May 21, 2012
C. Manzoni, S.-W. Huang, G. Cirmi, P. Farinello, J. Moses, F. X. Kärtner, and G. Cerullo, "Coherent synthesis of ultra-broadband optical parametric amplifiers," Opt. Lett. 37, 1880-1882 (2012)