Advanced Materials

Laser Oscillation in Monolithic Molecular Single Crystals


  • This work was supported by the Cooperative Link for Unique Science and Technology for Economy Revitalization (CLUSTER) of Japan's Ministry of Education, Culture, Sports, Science and Technology. It was also supported by the New Energy and Industrial Technology Development Organization (NEDO), in the area of Organic Materials Technology for Solid-State Injection Laser application, and by the Ministry's 21st Century COE program.


Evidence for oscillation in monolithic molecular single crystals of a thiophene/phenylene co-oligomer is reported. The laser oscillations (see Figure) are characterized by naturally formed crystal facet cavities with molecular-scale flatness. The multimode laser oscillation in a Fabry–Pérot resonator is characterized by sharply resolved spectroscopic lines with their full width at half maximum down to only 38 pm. The laser oscillation is characterized by the presence of a well-defined threshold.

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