title: Propagation dependence of chirp in Gaussian pulses and beams due to angular dispersion.
abstract: The chirp acquired by a Gaussian ultrashort pulse due to angular dispersion, unlike that of plane waves, increases nonlinearly with propagation distance and eventually asymptotes to a constant. However, this interesting result has never been directly measured. In this Letter, we use two-dimensional spectral interferometry to measure the propagation dependence of the chirp for Gaussian ultrashort pulses and beams with angular dispersion. The measured chirp as a function of propagation distance agreed well with theory. This work verifies both an equation and a measurement technique that will be useful for predicting or determining the pulse's chirp in ultrafast optics experiments that contain angular dispersion.
authors.affiliation: Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology, Wuhan, China.
authors.forename: Derong
authors.initials: D
authors.lastname: Li
authors.forename: Shaoqun
authors.initials: S
authors.lastname: Zeng
authors.forename: Qingming
authors.initials: Q
authors.lastname: Luo
authors.forename: Pamela
authors.initials: P
authors.lastname: Bowlan
authors.forename: Vikrant
authors.initials: V
authors.lastname: Chauhan
authors.forename: Rick
authors.initials: R
authors.lastname: Trebino