Enhanced spectral resolution for broadband coherent anti-Stokes Raman spectroscopy

• DOI: 10.1364/ol.388624
• Publication Date: 2020-02-03T19:30:12Z
• Authors: Faris Sinjab; Kazuki Hashimoto; Xuanqiang Zhao; Yu Nagashima; Takuro Ideguchi
• Keywords: Fourier transform spectroscopy; Spectral resolution; Coherent spectroscopy; Optical path length

The spectral resolution of broadband Fourier-transform coherent anti-Stokes Raman spectroscopy is limited by the maximum optical path length difference that can be scanned within a short time in an interferometer. However, alternatives to exist which bypass this limitation with certain assumptions. We apply one such approach using interferometers delay line (low Fourier resolution) and large (high resolution). With method, we demonstrate closely spaced vibrational bands possible interferometer, superior longer instrument. discuss how may particularly useful for more complex spectra, as those measured from biological samples.