title: Dispersion-free continuum two-dimensional electronic spectrometer.
abstract: Electronic dynamics span broad energy scales with ultrafast time constants in the condensed phase. Two-dimensional (2D) electronic spectroscopy permits the study of these dynamics with simultaneous resolution in both frequency and time. In practice, this technique is sensitive to changes in nonlinear dispersion in the laser pulses as time delays are varied during the experiment. We have developed a 2D spectrometer that uses broadband continuum generated in argon as the light source. Using this visible light in phase-sensitive optical experiments presents new challenges in implementation. We demonstrate all-reflective interferometric delays using angled stages. Upon selecting an ~180  nm window of the available bandwidth at ~10  fs compression, we probe the nonlinear response of broadly absorbing CdSe quantum dots and electronic transitions of Chlorophyll a.
authors.forename: Haibin
authors.initials: H
authors.lastname: Zheng
authors.forename: Justin R
authors.initials: JR
authors.lastname: Caram
authors.forename: Peter D
authors.initials: PD
authors.lastname: Dahlberg
authors.forename: Brian S
authors.initials: BS
authors.lastname: Rolczynski
authors.forename: Subha
authors.initials: S
authors.lastname: Viswanathan
authors.forename: Dmitriy S
authors.initials: DS
authors.lastname: Dolzhnikov
authors.forename: Amir
authors.initials: A
authors.lastname: Khadivi
authors.forename: Dmitri V
authors.initials: DV
authors.lastname: Talapin
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Engel
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D007909:Lenses; D013057:Spectrum Analysis / Q000295:instrumentation*