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Full-Text Articles in Physical Sciences and Mathematics
Well-Resolved Coherent Raman Spectra From Femtosecond Pulses, Sukhendu Nath, Diana Urbanek, Sean Kern, Mark Berg
Well-Resolved Coherent Raman Spectra From Femtosecond Pulses, Sukhendu Nath, Diana Urbanek, Sean Kern, Mark Berg
Sean J. Kern
This paper demonstrates a method for measuring coherent anti-Stokes Raman spectra with a resolution limited only by the inherent linewidth of the sample, even when using pulses of a width (60 fs, 300 cm−1) that is between the widths needed for a pure frequency- or time-domain measurement. Data are collected as a function of both delay and frequency and used to recover a standard Raman spectrum. The resulting time/frequency detected experiment represents a bridge between standard time- and frequency-domain approaches to spectroscopy.
Simultaneous Time And Frequency Detection In Femtosecond Coherent Raman Spectroscopy, Sukhendu Nath, Diana Urbanek, Sean Kern, Mark Berg
Simultaneous Time And Frequency Detection In Femtosecond Coherent Raman Spectroscopy, Sukhendu Nath, Diana Urbanek, Sean Kern, Mark Berg
Sean J. Kern
The preceding paper showed that, in principle, a high-resolution coherent Raman spectrum can be recovered using femtosecond probe pulses by combined detection in both time and frequency. This measurement is possible even when the pulses are too broad in frequency for conventional frequency-domain spectroscopy and too broad in time for conventional time-domain spectroscopy. In this paper, the method is tested on experimental coherent anti-stokes Raman spectroscopy data from acetonitrile. Compared to theoretical models, experimental data are complicated by noise and incomplete knowledge of the pulse structure. Despite these complications, most of the information in the Raman spectrum is recovered from …