Novel diffractive feedback structures for semiconducting polymer lasers

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Semiconducting conjugated polymers have recently attracted significant interest as amplifying media for solid-state lasers due to their functional photo-physical properties and simple fabrication. Distributed feedback (DFB) cavities are proving to be the most attractive for polymer lasers, since they can combine the properties of transverse optical pumping, low threshold and practical output beams. To date, in most polymer DFB lasers the feedback is provided by second order diffraction. This has the advantage of surface emission, though it also imposes extensive scattering losses. In this work, we present the use of alternative structures that attempt to reduce the threshold of polymer DFB lasers, and also achieve dual wavelength operation. The former was addressed with cavities formed by alternative symmetries of the Brillouin zone of a square lattice. Using the diagonal ΓM symmetry first order feedback was attained. The threshold energy was thus reduced by almost an order of magnitude as compared with the more commonly used ΓX symmetry of second order square gratings. Finally, we show that two lasing wavelengths may be set independently in a semiconducting polymer laser by using a doubly periodic (i.e. MoirÁ½) DFB grating.
Original languageEnglish
Title of host publicationProc. SPIE 5937
Subtitle of host publicationOrganic Light-Emitting Materials and Devices IX, 59371O
EditorsZ. H. Kafafi, P. A. Lane
Place of PublicationBellingham WA, USA
Publication statusPublished - Sept 2005
EventConference on Organic Light Emitting Materials and Devices IX - San Diego, United States
Duration: 31 Jul 200531 Jul 2005


ConferenceConference on Organic Light Emitting Materials and Devices IX
Country/TerritoryUnited States
CitySan Diego


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