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(Color online) Chemical structures of the host polymer BN-PFO and the dopant DPAVB (a). Absorption spectrum of the host and photoluminescence spectrum of the guest-host system DPAVB in BN-PFO. The amplified spontaneous emission is peaked at (b). Threshold energy density for second order DFB lasers of the neat BN-PFO polymer and the doped system pumped by a laser (c) (the lines are guides to the eye).
(Color online) Evolution of the spectral output of the organic laser under varied laser diode current (a). Inset (a): magnified laser emission spectrum. Output characteristics of the organic laser vs UV laser diode current (b). Inset (b): polarization diagram of the organic laser output slightly above threshold at a pump-laser current of .
(Color online) Tunability of the diode-pumped organic laser by variation of the DFB grating period (spectra have been normalized and vertically offset) (a). Laser threshold power density vs emission wavelength, upon pumping with the third harmonic of a laser and the violet laser diode, respectively. The dashed line is a guide to the eye.
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