title: A single source femtosecond-millisecond broadband spectrometer.
abstract: Time-resolved measurement of population dynamics extending over femtosecond to millisecond time scales typically requires a combination of transient absorption techniques involving different laser systems and detection schemes. The spectrometer design presented here facilitates transient absorption measurements over 12 decades with a single ultrafast laser system by picking pump and probe pulses independently from the laser oscillator pulse train. Unamplified pulses seed a photonic crystal fiber to a supercontinuum probe source for spectrally resolved measurements. The utility of the system is demonstrated by measuring triplet state dynamics following photoexcitation of vitamin B(6) in aqueous solution.
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
authors.forename: E C
authors.initials: EC
authors.lastname: Carroll
authors.forename: M P
authors.initials: MP
authors.lastname: Hill
authors.forename: D
authors.initials: D
authors.lastname: Madsen
authors.forename: K R
authors.initials: KR
authors.lastname: Malley
authors.forename: D S
authors.initials: DS
authors.lastname: Larsen
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D008029:Lighting / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*