title: Forty-photon-per-pulse spectral phase retrieval by shaper-assisted modified interferometric field autocorrelation.
abstract: We retrieve the spectral phase of 400 fs pulses at 1560 nm with 5.2 aJ coupled pulse energy (40 photons) by the modified interferometric field autocorrelation method, using a pulse shaper and a 5 cm long periodically poled lithium niobate waveguide. The carrier-envelope phase control of the shaper can reduce the fringe density of the interferometric trace and permits longer lock-in time constants, achieving a sensitivity of 2.7×10(-9) mW(2) (40 times better than the previous record for self-referenced nonlinear pulse measurement). The high stability of the pulse shaper allows for accurate and reproducible measurements of complicated spectral phases.
authors.affiliation: Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Chen-Shao
authors.initials: CS
authors.lastname: Hsu
authors.forename: Hsin-Chien
authors.initials: HC
authors.lastname: Chiang
authors.forename: Hsiu-Po
authors.initials: HP
authors.lastname: Chuang
authors.forename: Chen-Bin
authors.initials: CB
authors.lastname: Huang
authors.forename: Shang-Da
authors.initials: SD
authors.lastname: Yang