Selective excitation and suppression of coherent anti-Stokes Raman scattering by shaping femtosecond pulses |
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Authors: | Zhang Shi-An Zhang Hui Wang Zu-Geng and Sun Zhen-Rong |
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Institution: | State Key Laboratory of Precision Spectroscopy (East China Normal University), and Department of Physics, East China Normal University, Shanghai 200062, China |
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Abstract: | Femtosecond coherent anti-Stokes Raman scattering (CARS)
suffers from poor selectivity between neighbouring Raman levels
due to the large bandwidth of the femtosecond pulses. This paper
provides a new method to realize the selective excitation and
suppression of femtosecond CARS by manipulating both the probe and
pump (or Stokes) spectra. These theoretical results indicate that
the CARS signals between neighbouring Raman levels are
differentiated from their indistinguishable femtosecond CARS spectra
by tailoring the probe spectrum, and then their selective excitation
and suppression can be realized by supplementally manipulating the
pump (or Stokes) spectrum with the $\pi $ spectral phase step. |
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Keywords: | coherent anti-Stokes Raman scattering (CARS) selective
excitation selective suppression pulse shaping |
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