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Microfiber-assisted gigahertz harmonic mode-locking in ultrafast fiber laser

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Abstract

Optoacoustic interaction can be strongly enhanced in tiny core fibers, and it holds significant potential for stable harmonic mode-locking at gigahertz (GHz) and higher repetition rate. In this Letter, we propose and demonstrate a microfiber-assisted GHz harmonic mode-locking fiber laser, which is achieved by the enhanced optomechanical coupling between cavity modes in microfiber with the waist length of ${\sim}{16}\;{\rm cm}$ and the waist diameter of ${\sim}{1.56}\;\unicode{x00B5}{\rm m}$. The repetition rates can be stably locked at 2.3828 GHz and predominately locked at 1.7852 GHz, corresponding to the frequencies of radial ${{\rm R}_{01}}$ and torsional-radial ${{\rm TR}_{21}}$ acoustic modes, respectively. Our results provide novel insight into the design of a high-repetition-rate laser source and the application of microfibers in the optomechanical field.

© 2020 Optical Society of America

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Supplementary Material (1)

NameDescription
Visualization 1       Transition from the R01-induced HML to TR21-induced HML recorded by OSC

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