Mode-locked seven-core multicore photonic crystal fiber laser with a saturable absorber

Tomonari Kawamura; Akira Shirakawa

doi:10.1117/12.2582719

5 March 2021 Mode-locked seven-core multicore photonic crystal fiber laser with a saturable absorber

Tomonari Kawamura, Akira Shirakawa

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116651N (2021) https://doi.org/10.1117/12.2582719
Event: SPIE LASE, 2021, Online Only

Abstract

Multicore Photonic Crystal Fiber (MC-PCF) have multiple cores close to each other, which allows coherent beam combining (CBC). MC-PCF can scale the output power by increasing the number of cores by CBC if the in-phase mode is selected. We demonstrate simultaneous realization of phase-locked and mode-locked laser by using Yb-doped 7-core MC-PCF by a semiconductor saturable absorber placed in the near-filed inside a resonator. High energy 333 nJ pulses were obtained directly from a mode-locked fiber laser oscillator at a 42.4 MHz repetition rate with an average power of 14.1 W at 24 W excitation. We observed the direct output pulse duration of 52 ps by assuming a sech2 profile. However, it may be noise-like pulses because of no variation when we performed pulse compression. Single-pulse operation was achieved by increasing the bandwidth of intracavity filter. At this time, 129 nJ, 42.4 MHz pulses were generated with a 5.5 W average power and the direct output pulse duration of 42 ps.

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Citation Download Citation

Tomonari Kawamura and Akira Shirakawa "Mode-locked seven-core multicore photonic crystal fiber laser with a saturable absorber", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116651N (5 March 2021); https://doi.org/10.1117/12.2582719

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