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|Title:||Low-threshold amplified spontaneous emission in thin films of poly(tetraarylindenofluorene)||Authors:||Laquai, Fŕd́ric
Keivanidis, Panagiotis E.
|Major Field of Science:||Engineering and Technology||Field Category:||Mechanical Engineering||Issue Date:||1-Dec-2005||Source:||Applied Physics Letters, 2005, vol. 87, iss. 26, pp. 1-3||Volume:||87||Issue:||26||Start page:||1||End page:||3||Journal:||Applied Physics Letters||Abstract:||We report on amplification of blue light (469 nm) via amplified spontaneous emission in asymmetric planar waveguides of a fully arylated polyindenofluorene derivative. A very low threshold value of about 3 μJ cm2 (∼375 W cm2) for amplification of light has been demonstrated by pumping the waveguides at 3.0 eV (410 nm) with a stripe shape excitation beam. Moderate gain coefficients up to 21 cm-1 and loss coefficients around 6 cm-1 have been measured. All measurements were performed under ambient conditions. No sample degradation could be observed which testifies to the excellent stability of the material against photodegradation. © 2005 American Institute of Physics.||Description:||Funding text The authors acknowledge financial support by the German Ministry of Science and Education, Project OLAS, 13N8168. One of the authors (F.L.) wishes to thank the Fonds der Chemischen Industrie for providing a Kekulé scholarship. The authors acknowledge experimental assistance from H. Menges.||URI:||https://ktisis.cut.ac.cy/handle/10488/18166||ISSN:||0003-6951||DOI:||10.1063/1.2158508||Rights:||© American Institute of Physics.||Type:||Article||Affiliation :||Max Planck Institute for Polymer Research|
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