Sum-Frequency-Generation-Based Laser Sidebands for Tunable Femtosecond Raman Spectroscopy in the Ultraviolet Public Deposited

http://ir.library.oregonstate.edu/concern/articles/h415pc590

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  • Femtosecond stimulated Raman spectroscopy (FSRS) is an emerging molecular structural dynamics technique for functional materials characterization typically in the visible to near-IR range. To expand its applications we have developed a versatile FSRS setup in the ultraviolet region. We use the combination of a narrowband, ~400 nm Raman pump from a home-built second harmonic bandwidth compressor and a tunable broadband probe pulse from sum-frequency-generation-based cascaded four-wave mixing (SFG-CFWM) laser sidebands in a thin BBO crystal. The ground state Raman spectrum of a laser dye Quinolon 390 in methanol that strongly absorbs at ~355 nm is systematically studied as a standard sample to provide previously unavailable spectroscopic characterization in the vibrational domain. Both the Stokes and anti-Stokes Raman spectra can be collected by selecting different orders of SFG-CFWM sidebands as the probe pulse. The stimulated Raman gain with the 402 nm Raman pump is >21 times larger than that with the 550 nm Raman pump when measured at the 1317 cm⁻¹ peak for the aromatic ring deformation and ring-H rocking mode of the dye molecule, demonstrating that pre-resonance enhancement is effectively achieved in the unique UV-FSRS setup. This added tunability in the versatile and compact optical setup enables FSRS to better capture transient conformational snapshots of photosensitive molecules that absorb in the UV range.
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  • Zhu, L., Liu, W., Wang, Y., & Fang, C. (2015). Sum-Frequency-Generation-Based Laser Sidebands for Tunable Femtosecond Raman Spectroscopy in the Ultraviolet. Applied Sciences, 5(2), 48-61. doi:10.3390/app5020048
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  • description.provenance : Made available in DSpace on 2015-08-25T21:52:33Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) ZhuLiangdongChemistrySumFrequencyGeneration.pdf: 3656198 bytes, checksum: 3865e293f2243739c9972e789ba0b445 (MD5) Previous issue date: 2015-06
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-08-25T21:51:58Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) ZhuLiangdongChemistrySumFrequencyGeneration.pdf: 3656198 bytes, checksum: 3865e293f2243739c9972e789ba0b445 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-08-25T21:52:33Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) ZhuLiangdongChemistrySumFrequencyGeneration.pdf: 3656198 bytes, checksum: 3865e293f2243739c9972e789ba0b445 (MD5)

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