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Optical characteristics of spiro-terphenyl: absorption, photoluminescence and amplified spontaneous emission. The chemical structure is given in the inset.
Emission spectra of the organic semiconductor UV lasers; (a) TE modes on the grating segments A–F, (b) TM modes on the grating segments A–G.
Effective refractive indices of the organic DFB lasers for TE and TM modes.
Laser threshold energy densities for the DFB lasers. The inset shows the output power characteristic vs pump pulse energy density for the TE mode at 383 nm.
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