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Fluorescence lifetime three-dimensional microscopy with picosecond precision using a multifocal multiphoton microscope

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2 Author(s)
Straub, M. ; High Resolution Optical Microscopy Group, Max-Planck-Institute for Biophysical Chemistry, D-37070 Göttingen, Germany ; Hell, S.W.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.122276 

The combination of pulsed-mode excitation multifocal multiphoton microscopy with a high-repetition, time-gated intensified CCD camera enables efficient three-dimensional (3D) fluorescence lifetime imaging. With a 200-ps gate opening at 76 MHz repetition rate, fluorescence decay can be traced in a sequence of images with varying delays between pulse and gate. Fluorophore lifetimes are measured with a precision of a few picoseconds. As an application we show that, upon two-photon excitation at 800 nm, certain pollen samples feature a multiexponential fluorescence relaxation. Our results indicate that efficient four-dimensional microscopy with hundreds of nanometer spatial and tens of picoseconds temporal resolution is within reach. © 1998 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:73 ,  Issue: 13 )

Date of Publication:

Sep 1998

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