Abstract
A symmetric waveguide structure of air/crystal/air comprising a slab crystal of cyano substituted oligo(p-phenylenevinylene) (OPV) has been developed for organic crystal lasers. The OPV crystals exhibit high photoluminescence efficiency of 30% and have smooth surfaces and edges, which ensures strong self-cavity optical confinement and provides optical feedback for the laser oscillation. A single-mode laser oscillation is observed around 573 nm with a threshold of 12.8 kW/cm2 that is one of the lowest values for organic crystal lasers. The leaky loss caused by the substrate is prevented by the air/crystal/air waveguide structure.
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