title: Single-shot time-frequency imaging spectroscopy using an echelon mirror.
abstract: We demonstrate single-shot time-frequency imaging spectroscopy with an echelon mirror for measuring ultrashort laser pulses as well as ultrafast responses of materials using the same optical setup. The echelon mirror produces a spatially encoded time delay for the probe pulse whereby both the probe and pump pulses are focused on samples with small spot size. Using the optical Kerr gate apparatus, we successfully mapped the time-frequency images of ultrashort laser pulses and subsequently evaluated the chirp characteristics with the phase-retrieval procedure on a single-shot basis. By simply replacing the Kerr medium with samples, we could also visualize the phonon-polariton oscillations in ferroelectric LiNbO3.
authors.affiliation: Department of Physics, Graduate School of Engineering, Yokohama National University, Yokohama, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sakaibara
authors.forename: Yuki
authors.initials: Y
authors.lastname: Ikegaya
authors.forename: Ikufumi
authors.initials: I
authors.lastname: Katayama
authors.forename: Jun
authors.initials: J
authors.lastname: Takeda
mesh_terms: D007834:Lasers; D055620:Optical Phenomena; D013057:Spectrum Analysis / Q000295:instrumentation*; D013997:Time Factors