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. 2011 Jan 14;11(1):905–916. doi: 10.3390/s110100905

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Experimental Setup, consisting of a confocal microscope (detection not shown) with wide-field configuration. A flip mirror allows to switch between laser and LED type illumination. Inset: Two lens LED-assembly, the LED is mounted with thermal grease directly onto a 3 stage thermo-electric cooler (TEC), which is attached to a fan-cooled heat sink.