Please use this identifier to cite or link to this item: https://doi.org/10.1364/OE.22.009611
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dc.titleChirped time-resolved CARS microscopy with square-pulse excitation
dc.contributor.authorUpputuri, P.K.
dc.contributor.authorGong, L.
dc.contributor.authorWang, H.
dc.date.accessioned2014-10-16T09:18:09Z
dc.date.available2014-10-16T09:18:09Z
dc.date.issued2014-04-21
dc.identifier.citationUpputuri, P.K., Gong, L., Wang, H. (2014-04-21). Chirped time-resolved CARS microscopy with square-pulse excitation. Optics Express 22 (8) : 9611-9626. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.22.009611
dc.identifier.issn10944087
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/95988
dc.description.abstractTime-resolved coherent anti-Stokes Raman scattering (T-CARS) microscopy is a technique known for suppressing non-resonant background by utilizing the different temporal responses of virtual electronic transitions and Raman transitions. However, the previous use of femtosecond excitations in T-CARS microscopy has led to low spectral resolution and difficulty in selectively exciting a single Raman band. Here, we report an improved T-CARS imaging technique with chirped pump and Stokes excitations, and the Stokes pulses were shaped into square pulses. Using a femtosecond probe, we acquired T-CARS images with a high spectral resolution, suppressed non-resonant background, and high resonant signal level. We experimentally demonstrated the selective excitation of two close Raman bands of polystyrene at 1005 cm-1 and 1035 cm-1 using our technique; conventional T-CARS would inevitably excite them both with little selectivity. Our novel technique could become an ideal method for high-sensitivity, background-free imaging of single Raman bands for a wide variety of samples.©2013 Optical Society of America.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1364/OE.22.009611
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1364/OE.22.009611
dc.description.sourcetitleOptics Express
dc.description.volume22
dc.description.issue8
dc.description.page9611-9626
dc.identifier.isiut000335902200078
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