title: Spectrally modulated stimulated Raman scattering imaging with an angle-to-wavelength pulse shaper.
abstract: The stimulated Raman scattering signal is often accompanied by unwanted background arising from other pump-probe modalities. We demonstrate an approach to overcome this challenge based on spectral domain modulation, enabled by a compact, cost-effective angle-to-wavelength pulse shaper. The pulse shaper switches between two spectrally narrow windows, which are cut out of a broadband femtosecond pulse and selected for on- and off- Raman resonance excitation, at 2.1 MHz frequency for detection of stimulated Raman scattering signal. Such spectral modulation reduced the unwanted pump-probe signals by up to 20 times and enabled stimulated Raman scattering imaging of molecules in a pigmented environment.
authors.affiliation: Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Delong
authors.initials: D
authors.lastname: Zhang
authors.forename: Mikhail N
authors.initials: MN
authors.lastname: Slipchenko
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Leaird
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Weiner
authors.forename: Ji-Xin
authors.initials: JX
authors.lastname: Cheng