RECENT IMPROVEMENTS IN INSTRUMENTATION FOR ULTRAFAST BROADBAND TRANSIENT ABSORPTION AT MHz REPETITION RATES

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1992

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Ohio State University

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We have demonstrated the utility of chirped pulse amplification in the production of ultrafast broadband pulses as a probe for the measurement of the electronic absorption of transient species.1 Recent improvements in amplifier design and performance coupled with the increased spectral quality of seed pulses through coherent photon seeding have produced conditions necessary to generate an ultrashort continuum at MHz repetition rates. Our instrument is based on an actively mode-locked Nd: YAG laser pumping two individually tunable synchronously pumped, cavity dumped dye lasers operating at MHz repetition rates. The probe pulse is amplified using a 6-pass dye laser amplifier pumped by a cavity dumped argon ion at MHz repetition rates. Instrumental considerations and performance evaluation of the system will be presented.

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  1. L.A. Huston, K. Iwata, W.L. Weaver, and T.L. Gustafson, Opt. Commun., accepted for publication.

Author Institution: Department of Chemistry, The Ohio State University; Department of Chemistry, kanagawa Academy of Science and Technology (KAST)

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