The search for the electrically-excited organic laser has a long history. These three papers report on the first successful observation of coherent emission from electrically-excited organic semiconductors. The gain medium in these interferometric emitters is the laser dye coumarin 545 tetramethyl. The emission is generated in a miniature, sub micrometer, resonator. The emission beam is nearly diffraction limited and the spectral linewidth has been determined, using interferometric means, to be ~ 11 nm (at half width) which approximates the linewidths available from broadband dye lasers. Work is in progress to elucidate the origin of the observed coherence.

• F. J. Duarte, L. S. Liao, and K. M. Vaeth, Coherence characteristics of electrically excited tandem organic light-emitting diodes, Opt. Lett. 30, 3072-3074 (2005).
  
  
  
  
• F. J. Duarte, Coherent electrically-excited organic semiconductors: visibility of interferograms and emission linewidth, Opt. Lett. 32, 412-414 (2007).
  
  
  
  
• F. J. Duarte, Coherent electrically excited organic semiconductors: coherent or laser emission?, Appl. Phys. B 90, 101-108 (2008).
  
  

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Published on the 23rd of June, 2008.

Updated on the 25th of June, 2008.