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Proceedings Paper

Laser threshold analysis of first- and second-order organic solid state distributed feedback laser
Author(s): Daniel Schneider; Soeren Hartmann; Thomas Dobbertin; Torsten Benstem; Dirk Metzdorf; Eike Becker; Anis Kammoun; Christian Schildknecht; Henning Krautwald; Hans-Hermann Johannes; Thomas Riedl; Wolfgang Kowalsky
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Paper Abstract

Optically pumped organic semiconductor thin-films have been processed on first and second order distributed feedback gratings. The organic thin-films were made by co-evaporation of tris-(8-hydroxy quinoline)aluminium (Alq3) and the laser dye 4-(Dicyanomethylene)-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran (DCM2). The DFB laser wavelength varied depending on the grating period between 647.8 nm and 668.6 nm for first order operation and between 626.7 nm and 640.1 nm for second order operation. By evaporating the same organic film on both resonator designs we could compare first and second order laser parameters. We measured laser output characteristics and determined threshold energy values for different wavelengths and for first and second order of the Bragg grating. The laser threshold energy of the first order organic DFB laser was reduced by a factor 8 compared to the second order laser. Minimum threshold energy density was measured for a first order sample with 13.8 μJ/cm2. Reducing the laser threshold value is especially important for future applications like electrically driven organic solid-state lasers, where it will be more difficult to reach the laser threshold excitation.

Paper Details

Date Published: 16 February 2004
PDF: 8 pages
Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); doi: 10.1117/12.505792
Show Author Affiliations
Daniel Schneider, Technische Univ. Braunschweig (Germany)
Soeren Hartmann, Technische Univ. Braunschweig (Germany)
Thomas Dobbertin, Technische Univ. Braunschweig (Germany)
Torsten Benstem, Technische Univ. Braunschweig (Germany)
Dirk Metzdorf, Technische Univ. Braunschweig (Germany)
Eike Becker, Technische Univ. Braunschweig (Germany)
Anis Kammoun, Technische Univ. Braunschweig (Germany)
Christian Schildknecht, Technische Univ. Braunschweig (Germany)
Henning Krautwald, Technische Univ. Braunschweig (Germany)
Hans-Hermann Johannes, Technische Univ. Braunschweig (Germany)
Thomas Riedl, Technische Univ. Braunschweig (Germany)
Wolfgang Kowalsky, Technische Univ. Braunschweig (Germany)


Published in SPIE Proceedings Vol. 5214:
Organic Light-Emitting Materials and Devices VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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