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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 4 — Feb. 15, 2007
  • pp: 412–414

Coherent electrically excited organic semiconductors: visibility of interferograms and emission linewidth

F. J. Duarte  »View Author Affiliations


Optics Letters, Vol. 32, Issue 4, pp. 412-414 (2007)
http://dx.doi.org/10.1364/OL.32.000412


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Abstract

Recently, a tandem organic light-emitting diode structure, excited electrically in the pulsed domain and confined within a double interferometric configuration, was observed to emit a low-divergence beam ( 1.1 times the diffraction limit) with a near-Gaussian spatial distribution. The emission originates from the laser dye Coumarin 545 T used as dopant. It has since been determined that the visibility of the interferograms, from the spatially coherent emission, is V 0.90 . This result is compared with the visibility obtained from a known narrow linewith laser source ( V 0.95 ) and with various published values from the relevant literature. The significance of this result is discussed in addition to an interferometric estimate of the emission linewidth that yields Δ λ 11 nm . The present interferometric analysis indicates that the spectral component of the spatially coherent radiation is comparable with the spectral characteristics of well-known broadband dye lasers.

© 2007 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(230.3670) Optical devices : Light-emitting diodes
(260.3160) Physical optics : Interference
(350.5500) Other areas of optics : Propagation

ToC Category:
Optical Devices

History
Original Manuscript: October 20, 2006
Revised Manuscript: November 9, 2006
Manuscript Accepted: November 9, 2006
Published: January 26, 2007

Citation
F. J. Duarte, "Coherent electrically excited organic semiconductors: visibility of interferograms and emission linewidth," Opt. Lett. 32, 412-414 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-4-412

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