Abstract

A single-longitudinal-mode (SLM) fiber ring laser based on topological insulator (TI) Bi₂Te₃ saturable absorber (SA) had been experimentally demonstrated. The TI: Bi₂Te₃ nanosheets, which were fabricated through the bottom-up approach, were coated onto the microfiber as an efficient saturable absorber device to ensure the SLM operation. Combined with fiber Bragg grating, the output wavelength can be continuously tuned about 1 nm. Without any accurate cavity control, stable SLM operation without mode hopping had been conveniently achieved. Based on the Lorentzian fitting, the line-width was measured to be less than 10 kHz. The output power of SLM fiber laser can reach up to 23 mW, indicating that the proposed TI-based SA may be suitable for high-optical power SLM operation in the future.

© 2014 IEEE

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