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>Construction of a timehyphen;frequency twohyphen;dimensional multiplex coherent antihyphen;Stokes Raman scattering spectrometer having 15 ps time resolution
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Construction of a timehyphen;frequency twohyphen;dimensional multiplex coherent antihyphen;Stokes Raman scattering spectrometer having 15 ps time resolution
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机译：Construction of a timehyphen;frequency twohyphen;dimensional multiplex coherent antihyphen;Stokes Raman scattering spectrometer having 15 ps time resolution
A picosecond timehyphen;resolved multiplex coherent antihyphen;Stokes Raman scattering (CARS) spectrometer based on a new principle has been constructed using a femtosecond laser, nanosecond lasers, and a streak camera. The second harmonic of the output from the femtosecond Ti:sapphire oscillator/regenerativehyphen;amplifier system is used for the photoexcitation. The second harmonic of a nanosecond Nd:YLF laser is used as CARS probing ohgr;1radiation, and the output of a nanosecond broadband dye laser is used as ohgr;2radiation. CARS signals, which are generated from the sample during the nanosecond probing pulses, are analyzed in the frequency domain by a spectrograph and are resolved in the time domain by a streak camera. This enables us multiplex CARS measurements not only in the frequency domain but also in the time domain (termed twohyphen;dimensional multiplex CARS). Consequently, CARS spectra at various delay times are obtainable with a single measurement. Owing to the short duration and high stability of the femtosecond pumping pulses, time resolution as high as 15 ps has been achieved. Picosecond timehyphen;resolved CARS spectra of allhyphen;trans retinal and bgr;hyphen;carotene are presented to demonstrate the high capability of the constructed system. The factors which determine the time resolution of this CARS spectrometer are discussed.
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