title: Ultrafast mid-infrared spectroscopy by chirped pulse upconversion in 1800-1000cm(-1) region.
abstract: Broadband femtosecond mid-infrared pulses can be converted into the visible spectral region by chirped pulse upconversion. We report here the upconversion of pump probe transient signals in the frequency region below 1800cm(-1), using the nonlinear optical crystal AgGaGeS4, realizing an important expansion of the application range of this method. Experiments were demonstrated with a slab of GaAs, in which the upconverted signals cover a window of 120cm(-1), with 1.5cm(-1) resolution. In experiments on the BLUF photoreceptor Slr1694, signals below 1 milliOD were well resolved after baseline correction. Possibilities for further optimization of the method are discussed. We conclude that this method is an attractive alternative for the traditional MCT arrays used in most mid-infrared pump probe experiments.
authors.affiliation: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
authors.forename: Jingyi
authors.initials: J
authors.lastname: Zhu
authors.forename: Tilo
authors.initials: T
authors.lastname: Mathes
authors.forename: Andreas D
authors.initials: AD
authors.lastname: Stahl
authors.forename: John T M
authors.initials: JT
authors.lastname: Kennis
authors.forename: Marie Louise
authors.initials: ML
authors.lastname: Groot
mesh_terms: D001152:Arsenicals / Q000737:chemistry; D001426:Bacterial Proteins / Q000737:chemistry*; D003460:Crystallization; D004867:Equipment Design; D005708:Gallium / Q000737:chemistry; D007259:Infrared Rays; D016011:Normal Distribution; D055095:Optics and Photonics; D020283:Photoreceptors, Microbial / Q000737:chemistry*; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013055:Spectrophotometry, Infrared / Q000295:instrumentation* / Q000379:methods*; D013057:Spectrum Analysis; D013997:Time Factors
chemical_list: D001152:Arsenicals; D001426:Bacterial Proteins; D020283:Photoreceptors, Microbial; C043055:gallium arsenide; D005708:Gallium