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Title: Chirped time-resolved CARS microscopy with square-pulse excitation
Authors: Upputuri, P.K.
Gong, L.
Wang, H. 
Issue Date: 21-Apr-2014
Citation: Upputuri, 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.
Abstract: Time-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.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.22.009611
Appears in Collections:Staff Publications

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