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|Title:||Chirped time-resolved CARS microscopy with square-pulse excitation|
|Source:||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. https://doi.org/10.1364/OE.22.009611|
|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|
|Appears in Collections:||Staff Publications|
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