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Journal of Biomedical Optics • Open Access

Fast spectral coherent anti-Stokes Raman scattering microscopy with high-speed tunable picosecond laser
Author(s): Harsono Cahyadi; Junichi Iwatsuka; Takeo Minamikawa; Hirohiko Niioka; Tsutomu Araki; Mamoru Hashimoto

Paper Abstract

We develop a coherent anti-Stokes Raman scattering (CARS) microscopy system equipped with a tunable picosecond laser for high-speed wavelength scanning. An acousto-optic tunable filter (AOTF) is integrated in the laser cavity to enable wavelength scanning by varying the radio frequency waves applied to the AOTF crystal. An end mirror attached on a piezoelectric actuator and a pair of parallel plates driven by galvanometer motors are also introduced into the cavity to compensate for changes in the cavity length during wavelength scanning to allow synchronization with another picosecond laser. We demonstrate fast spectral imaging of 3T3-L1 adipocytes every 5  cm −1 in the Raman spectral region around 2850  cm −1 with an image acquisition time of 120 ms. We also demonstrate fast switching of Raman shifts between 2100 and 2850  cm −1 , corresponding to CD 2 symmetric stretching and CH 2 symmetric stretching vibrations, respectively. The fast-switching CARS images reveal different locations of recrystallized deuterated and nondeuterated stearic acid.

Paper Details

Date Published: 6 September 2013
PDF: 8 pages
J. Biomed. Opt. 18(9) 096009 doi: 10.1117/1.JBO.18.9.096009
Published in: Journal of Biomedical Optics Volume 18, Issue 9
Show Author Affiliations
Harsono Cahyadi, Osaka Univ. (Japan)
Junichi Iwatsuka, Osaka Univ. (Japan)
Takeo Minamikawa, Kyoto Prefectural Univ. of Medicine (Japan)
Hirohiko Niioka, Osaka Univ. (Japan)
Tsutomu Araki, Osaka Univ. (Japan)
Mamoru Hashimoto, Osaka Univ. (Japan)

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