Tm-doped fiber laser mode-locked by graphene-polymer composite
M. Zhang, E. J. R. Kelleher, F. Torrisi, Z. Sun, T. Hasan, D. Popa, F., Wang, A. C. Ferrari, S. V. Popov, J. R. Taylor
TL;DR
This paper reports a stable, low-cost, mode-locked thulium-doped fiber laser at 1.94μm using a graphene-polymer saturable absorber, producing ultrashort pulses suitable for biomedical and sensing applications.
Contribution
It introduces a novel graphene-based saturable absorber for mode-locking at 1.94μm in thulium-doped fiber lasers, demonstrating stable ultrashort pulse generation.
Findings
Pulse duration of 3.6 ps
Pulse energy of 0.4 nJ
Amplitude fluctuation of 0.5%
Abstract
We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94\mu m, using a graphene-based saturable absorber. The laser outputs 3.6ps pulses, with~0.4nJ energy and an amplitude fluctuation~0.5%, at 6.46MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics
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