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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 1 — Jan. 4, 2012

Spectral modulation observed in Chl-a by ultrafast laser spectroscopy

Juan Du, Kazuaki Nakata, Yongliang Jiang, Eiji Tokunaga, and Takayoshi Kobayashi  »View Author Affiliations

Optics Express, Vol. 19, Issue 23, pp. 22480-22485 (2011)

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Broadband real-time dynamic vibronic coupling in Chl-a were experimentally studied using few cycle laser pulses of 6.8fs duration and a 128-channnel lock-in amplifier. Thanks to the extreme temporal resolution benefitting from the ultrashort laser pulse, the real-time modulation of the electronic transition energy induced by the molecular vibrations were calculated by the time dependent first moments of the bleaching band. The transition energy was found to be modulated periodically with the same frequencies of molecular vibration found in the Fourier amplitude spectrum of the difference absorbance real-time traces. This was interpreted to be due to the difference in the effective transition energy associated with the wavepacket motion induced by the equilibrium positions of potential curves between the ground state and the excited state. Using the values, Huang–Rhys factors for several vibrational modes involved in the spectral modulation at the room-temperature have been determined.

© 2011 OSA

OCIS Codes
(140.7090) Lasers and laser optics : Ultrafast lasers
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.2250) Ultrafast optics : Femtosecond phenomena
(160.1435) Materials : Biomaterials

ToC Category:
Nonlinear Materials and Spectroscopy

Original Manuscript: August 30, 2011
Revised Manuscript: September 22, 2011
Manuscript Accepted: September 23, 2011
Published: October 25, 2011

Virtual Issues
Nonlinear Optics (2011) Optical Materials Express
Vol. 7, Iss. 1 Virtual Journal for Biomedical Optics

Juan Du, Kazuaki Nakata, Yongliang Jiang, Eiji Tokunaga, and Takayoshi Kobayashi, "Spectral modulation observed in Chl-a by ultrafast laser spectroscopy," Opt. Express 19, 22480-22485 (2011)

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