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We have observed unusually narrowed emission lines from a single crystal of thiophene/phenylene co-oligomer. Very narrow lines (0.07 nm of linewidth) arise around 493 and 466 nm by photopumping a long slender region of the crystal. The relevant emissions are due to the lasing caused by high gain media. The photopumping configuration of the crystal in the present studies is useful in examining how the relevant lines are gain narrowed under each specific measurement. © 2003 American Institute of Physics.