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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 7 — Jul. 1, 2007
  • pp: 1633–1638

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)

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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

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

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)

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