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Direct generation of vortex pulses from a 346-MHz fiber mode-locked laser
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DOI：10.1016/j.optlaseng.2026.109745.png)
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Abstract
En 中文
Ultrafast vortex lasers with high fundamental repetition rates hold transformative potential in high-speed spectroscopy and precision metrology. However, the challenge in achieving high-repetition-rate mode-locking with a broad spectral bandwidth lies in the fact that a high repetition rate necessitates a shorter cavity length, whereas a wider spectral range requires more nonlinear accumulation, creating a fundamental trade-off. Here, we present a compact vortex fiber laser that resolves this dilemma by integrating intracavity-vortex generation with a high-repetition-rate mode-locked architecture. By utilizing a non-reciprocal solid-state fiber laser configuration integrated with dual WDM-collimators, the laser emits pulses with a repetition rate of 346.25 MHz, which is characterized by a duration of 1.58 ps and a spectral bandwidth of 21.1 nm. Besides, the capability of on-demand switching between +/- 1 topological charges is demonstrated. To our knowledge, the presented vortex fiber laser exhibits the highest fundamental repetition rate reported to date. This work establishes a paradigm for ultrafast vortex sources, directly addressing the escalating demand for high-speed, broadband structured light in spectroscopy and metrology.
Keywords:
Ultrafast fiber laser
Vortex laser
Orbital angular momenta
Mode-locking
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