Journal
OPTICS EXPRESS
Volume 21, Issue 11, Pages 13864-13874Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.013864
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Funding
- NIH [R21GM104681]
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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. (C) 2013 Optical Society of America
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