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Proceedings Paper

Organic semiconductor distributed feedback laser as excitation source in Raman spectroscopy using free-beam and fibre coupling
Author(s): Xin Liu; Sergei Lebedkin; Timo Mappes; Sebastian Köber; Christian Koos; Manfred Kappes; Uli Lemmer
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Paper Abstract

Enabled by the broad spectral gain and the efficient energy conversion in the active material, organic semiconductor lasers are promising for spectroscopic applications and have been recently applied for high resolution absorption and transmission spectroscopy. Here, we present the application of organic semiconductor DFB laser (DFB-OSL) as excitation source in Raman spectroscopy. Utilizing an efficient small molecule blend of tris (8-hydroxyquinoline) aluminum (Alq3) doped with the laser dye 4-(dicyano-methylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM), our encapsulated DFB-OSL achieved a high slope efficiency of 7.6%. The organic lasers were tested in the inverted and upright Raman microscope setups, using free-beam and fibre coupling, respectively. In the free-beam configuration, the emission beam was guided directly into an inverted microscope. Employing a spectrally tunable DFBOSL as the excitation source, we measured the Raman spectra of sulfur and improved the Raman signals for a given optical filter configuration. In the fibre coupling configuration, the organic laser was coupled into a 50 μm multi-mode optical fibre with an efficiency of 70 %. We utilized a round-to-line fibre-bundle for an efficient collection and transfer of Raman light to a spectrograph, by keeping a sufficient spectral resolution. Raman tests were performed on cadmium sulfide and cyclohexane. Our novel fibre-coupled organic laser provides a modular laboratory Raman system.

Paper Details

Date Published: 1 May 2014
PDF: 7 pages
Proc. SPIE 9137, Organic Photonics VI, 91370Y (1 May 2014); doi: 10.1117/12.2051645
Show Author Affiliations
Xin Liu, Karlsruher Institut für Technologie (Germany)
Sergei Lebedkin, Karlsruher Institut für Technologie (Germany)
Timo Mappes, Karlsruher Institut für Technologie (Germany)
Carl Zeiss AG (Germany)
Sebastian Köber, Karlsruher Institut für Technologie (Germany)
Christian Koos, Karlsruher Institut für Technologie (Germany)
Manfred Kappes, Karlsruher Institut für Technologie (Germany)
Uli Lemmer, Karlsruher Institut für Technologie (Germany)


Published in SPIE Proceedings Vol. 9137:
Organic Photonics VI
Barry P. Rand; Chihaya Adachi; David Cheyns; Volker van Elsbergen, Editor(s)

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