Optically pumped lasing from organic microcavity

Abstract

An optically pumped organic laser has been fabricated using a DCM (4-dicyanmethylene-2-methyl-6-4H-pyran)-doped Alq (tris (8-hydroxyquinoline) aluminum) film as the gain medium sandwiched between a high-reflectance distributed Bragg reflector and a silver reflector. The stimulated emission properties were investigated by short-pulse laser pumping. The intensity ratio of the resonant peak at 604 nm to the DBR (distributed Bragg reflector)-modulated free space emission band changed greatly with increasing pump energy density. The dependence on the pump energy density of the output properties including the cavity mode output, the total output, and the ratio of the cavity output versus total output, indicates a clear threshold energy density of 400 ± 20 µJ/cm 2 . The effective gain coefficient at the threshold was about 250 ± 14 cm −1 .

Monolithic polymer microcavity lasers with on-top evaporated dielectric mirrors

“…Unfortunately, the direct deposition of dielectric mirrors onto organic materials, needed for DBR-based monolithic VCSELs, is not straightforward because the high temperature ͑T͒, usually Ͼ200 °C, needed for this processes causes: ͑i͒ Loss of adhesion of the organic compounds, driven above their softness transition, and ͑ii͒ strong deterioration of their optical properties, especially in the oxygen atmosphere normally employed for reactive oxide growths. For these reasons, to date, organic microcavities have been generally realized by evaporating a metallic mirror [1][2][3][4] or by sandwiching an organic film between two prerealized DBRs. 14,15 Very few studies have been performed on DBR fabrication by alternative low-T approaches.…”

THz oscillations from optically anisotropic planar microcavities and organic microcavity lasers

“…The high Q-factor (up to Q > 4000) generated by the high reflectance mirrors increases the internal electric field and thus reduces the laser threshold. 18 In comparison with OVCSEL designs with one metal mirror, 8,19 the laser threshold has been decreased by one order of magnitude.…”

Vers l'optoélectronique organique bas coût

“…Mais bien d'autres existent (16) Des seuils de densité d'énergie de 400 µJ/cm 2 avec des gains efficaces au seuil de 250 cm -1 ont pu être obtenus dans le premier cas de structure, le plus simple à réaliser (3).…”