Optically pumped lasing from single crystals of a cyano-substituted thiophene/phenylene co-oligomer

Room temperature optically pumped lasing is achieved for a new n-type molecular crystal of 2,5-bis(4?-cyanobiphenyl-4-yl)­thiophene (BP1T-CN). Efficient stimulated emission in the Fabry-Pérot crystal cavity is supported with a high group refractive index (4.18-4.98), Q factor (910-1860), material gain coefficient (120 cm-1), and a high stimulated emission rate demonstrated by pump-probe measurements.