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As a new member of saturable absorber (SA), molybdenum carbide (Mo 2 C) has some excellent optical properties. Herein, we report a new type of Mo 2 C/fluorine mica (FM) SA device. Uniform and compact Mo 2 C films were deposited on the FM by magnetron sputtering method. In order to increase the laser damage threshold, an additional protective layer of silicon oxide was deposited on the Mo 2 C. The FM is a single-layer structure of 20 μm, and its high elasticity makes it not easy to fracture. The transmission rate of FM is as high as 90% at near infrared wavelength. FM has better heat dissipation and softening temperature than organic composite materials, so it can withstand higher laser power without being damaged. In this work, Mo 2 C/FM SA was cut into small pieces and inserted into erbium-doped fiber laser to achieve mode-locked operation. The pulse duration and average output power of the laser pulses were 313 fs and 64.74 mW, respectively. In addition, a 12th-order sub-picosecond harmonic mode-locking was generated. The maximum repetition rate was 321.6 MHz and the shortest pulse duration was 338 fs. The experimental results show that Mo 2 C/FM SA is a broadband nonlinear optical mode-locker with excellent performance.

2D molybdenum carbide (Mo 2 C)/fluorine mica (FM) saturable absorber for passively mode-locked erbium-doped all-fiber laser