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Ultralow-threshold continuous-wave lasing assisted by a metallic optofluidic cavity exploiting continuous pump

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Abstract

We report an ultralow-threshold continuous-wave lasing via a metallic optofluidic resonant cavity based on the symmetrical metal-cladding waveguide. The high quality factor Q and spontaneous emission coupling factor β of the waveguide strengthen the interaction between the gain medium and the ultrahigh order modes (UOMs); hence, the room-temperature, narrowband lasing can be effectively pumped by a continuous laser of low intensity. Rhodamine 6G and methylene blue are chosen to verify the applicability of the proposed concept. Lasing is emitted from the chip surface when the pumped laser is well coupled into the UOMs. For methylene blue with a concentration of 2.57*1013mol/ml, the operated emission can be observed with the launched pump threshold as low as 2.1μW/cm2.

© 2018 Optical Society of America

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