Abstract
AbstractWe have investigated the laser oscillation and its polarization feature of a thin polygon crystal of a thiophene/phenylene co‐oligomer grown by the novel liquid‐phase method. The emission spectrum from the crystal ca ‐plane (along the b‐axis) narrows with increasing energy of the pulsed laser excitation, which is incident perpendicularly to the crystal plane (the ab ‐plane). The multi‐mode laser oscillation was observed around 515 nm with the excitation over 5 mJ/cm2 per pulse. A mode separation and a full width at half maximum of the peak were estimated to be ∼0.2 nm and ∼65–85 pm, respectively. The laser emission was confirmed to be strongly polarized along the c‐axis. Its polarization ratio of the c‐axis to the a‐axis was estimated to be ∼550. This large ratio is due to the upright configuration of the molecular long axis that is almost perpendicular to the ab‐plane. These results indicate that the present polygon thin crystal is suitable for laser device application. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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