Gain-narrowed emissions from oligomer crystals assisted by interference exposure

We have carried out emission measurements on semiconducting oligomer crystal slabs using interference exposure with a Lloyd mirror. We used this mirror for the purposes of both photopumping the oligomer slab and fabricating a diffraction grating on an insulating polymer supported with a glass substrate. With the latter purpose we made a distributed feedback (DFB) structure by laminating the insulating polymer with another oligomer slab. The resulting DFB structure was further served for the laser excitation measurement. The emission measurements reveal that a few emission lines are selectively intensified and gain-narrowed.