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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 8 — Aug. 10, 2007

Ultrasensitive femtosecond time-resolved fluorescence spectroscopy for relaxation processes by using parametric amplification

Xiao-Feng Han, Xing-Hai Chen, Yu-Xiang Weng, and Jing-Yuan Zhang  »View Author Affiliations


JOSA B, Vol. 24, Issue 7, pp. 1633-1638 (2007)
http://dx.doi.org/10.1364/JOSAB.24.001633


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Abstract

We report the gain factor, detection limit, and linearity of a femtosecond time-resolved spectrometer for ultraweak fluorescence based on a 400 nm pumped femtosecond noncollinear optical parametric amplifier. By employing the parametric fluorescence amplifier, the time-resolved fluorescence spectra of Rhodamine 6G dye in ethanol was measured. It is proved that a good spectral fidelity has been achieved in the measurement of fluorescence spectra with this technique. The measured gain factor of this parametric fluorescence amplifier is found to be 1.2 × 10 6 , and the detection limit is 5.1 aJ per pulse, corresponding to 15 fluorescence photons at 580 nm . With this technique, we have acquired the transient fluorescence spectra as well as the fluorescence decay profile of Cd S x Se 1 x ( x = 0.78 ) nanobelts. Our results demonstrate the feasibility of this technique as an ultrasensitive time-resolved fluorescence spectrometer.

© 2007 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Ultrafast Optics

History
Original Manuscript: December 13, 2006
Revised Manuscript: February 26, 2007
Manuscript Accepted: February 27, 2007
Published: June 15, 2007

Virtual Issues
Vol. 2, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Xiao-Feng Han, Xing-Hai Chen, Yu-Xiang Weng, and Jing-Yuan Zhang, "Ultrasensitive femtosecond time-resolved fluorescence spectroscopy for relaxation processes by using parametric amplification," J. Opt. Soc. Am. B 24, 1633-1638 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josab-24-7-1633

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