Picosecond Raman Spectroscopy: A Two Dye Laser Synchronously Pumped Raman System

Y C Chung; J B Hopkins; P M Rentzepis

doi:10.1117/12.938950

25 November 1986 Picosecond Raman Spectroscopy: A Two Dye Laser Synchronously Pumped Raman System

Y C Chung, J B Hopkins, P M Rentzepis

Proceedings Volume 0669, Laser Applications in Chemistry; (1986) https://doi.org/10.1117/12.938950
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

Raman spectroscopy is a mature field of science that does not need introduction nor rationalization for its use. The majority of the Raman spectroscopy literature is concerned with C.W. high resolution spectroscopy. The Raman Scattering instruments utilize almost exclusively laser light sources, and lately nanosecond and picosecond data on time resolved spectra have made their entrance into the scientific journals. The difficulty in most of these resonance Raman experiments is that they do not provide any more time dependent information than fluorescence. This is due to the limitation that a single laser, quite often, a dye laser and its second harmonic are the only two frequencies available for excitation and resonance probe of the excited state. In this scenario, a Raman Scattering signal is emitted and detected only during the lifetime of the excited state. As the excited state decays to either the ground state or other transient species which absorb at a different wavelength, the resonance with the probe wavelength disappears at the same rate as the population of the excited state decays. This rate of depopulation is also portrayed in an identical fashion. These systems are therefore drastically limited in their use as means for the measurement of the evolution of a chemical intermediate. An additional interesting aspect is that of the understanding of the process itself which is being studied, namely the majority of the research papers presented do not address the possibility of the data depicting stimulated emission gain rather than Raman Scattering.

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Y C Chung, J B Hopkins, and P M Rentzepis "Picosecond Raman Spectroscopy: A Two Dye Laser Synchronously Pumped Raman System", Proc. SPIE 0669, Laser Applications in Chemistry, (25 November 1986); https://doi.org/10.1117/12.938950

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KEYWORDS

Raman spectroscopy

Dye lasers

Picosecond phenomena

Raman scattering

Polarization

Chemistry

Mirrors

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