title: Longitudinal coherence of organic-based microcavity lasers.
abstract: We report on the measurement of the longitudinal coherence of organic microcavity lasers based on a conjugated polymer. By using a modified Michelson interferometer configuration enabling single-shot measurements of the coherence length, the transition from spontaneous emission to lasing is investigated. The measured coherence length grows upon increasing the pumping fluence, saturating around 45 microm above threshold. At large fluences, possible thermal and photo-oxidation processes occurring in the gain medium limit the further increase of the coherence length. Our results are important for understanding lasing emission in organic microcavities and optimizing the device design and performances.
authors.affiliation: National Nanotechnology Laboratory of INFM-CNR,c/o Distretto Tecnologico, Università del Salento, via Arnesano, I-73100 Lecce, Italy. andrea.camposeo@unile.it
authors.forename: Andrea
authors.initials: A
authors.lastname: Camposeo
authors.forename: Luana
authors.initials: L
authors.lastname: Persano
authors.forename: Pompilio
authors.initials: P
authors.lastname: Del Carro
authors.forename: Dimitris G
authors.initials: DG
authors.lastname: Papazoglou
authors.forename: Andreas
authors.initials: A
authors.lastname: Stassinopoulos
authors.forename: Demetrios
authors.initials: D
authors.lastname: Anglos
authors.forename: Roberto
authors.initials: R
authors.lastname: Cingolani
authors.forename: Dario
authors.initials: D
authors.lastname: Pisignano
mesh_terms: D002625:Chemistry, Organic / Q000379:methods; D004867:Equipment Design; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods; D007834:Lasers; D008027:Light; D055095:Optics and Photonics; D009930:Organic Chemicals / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D010777:Photochemistry / Q000379:methods*; D017785:Photons; D011108:Polymers / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D011108:Polymers; D010100:Oxygen