Journal
OPTICS EXPRESS
Volume 21, Issue 6, Pages 6866-6872Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.006866
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Funding
- European Research Council [207916]
- National Science Foundation CAREER Award [NSF-1151555]
- European Research Council (ERC) [207916] Funding Source: European Research Council (ERC)
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1151555] Funding Source: National Science Foundation
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Spectral compression of femtosecond pulses by second harmonic generation in the presence of substantial group velocity dispersion provides a convenient source of narrowband Raman pump pulses for femtosecond stimulated Raman spectroscopy (FSRS). We discuss here a simple and efficient modification that dramatically increases the versatility of the second harmonic spectral compression technique. Adding a spectral filter following second harmonic generation produces narrowband pulses with a superior temporal profile. This simple modification i) increases the Raman gain for a given pulse energy, ii) improves the spectral resolution, iii) suppresses coherent oscillations associated with slowly dephasing vibrations, and iv) extends the useful tunable range to at least 330-750 nm. (C) 2013 Optical Society of America
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