High-energy Q-switched Fiber Laser Research Articles

Black Phosphorus Q-Switched Large-Mode-Area Tm-Doped Fiber Laser

We report on a passively Q-switched fiber laser with black phosphorus as saturable absorber. By employing the sol-gel fabricated large-mode-area Tm-doped fiber as gain medium, a high-energy Q-switched fiber laser has been demonstrated which delivers the maximum pulse energy of 11.72 μJ with the pulse width of 660 ns at the wavelength of 1954 nm. Our experimental results indicate that BP Q-switched large-mode-area Tm-doped fiber laser is an effective and reliable approach to generate high-energy pulses at 2 μm.

Large energy, all-fiberized Q-switched pulse laser using a GNRs/PVA saturable absorber

We experimentally demonstrate the use of gold nanorods (GNRs)/PVA composite-deposited side-polished fiber as an efficient saturable absorber for use in an all-fiberized, high-energy Q-switched fiber laser. The modulation depth of the prepared saturable absorber was of ~7.5% at wavelength of 1549.8 nm. Stable Q-switched pulses with a single pulse energy of ~2.56 μJ were readily generated from a fiber Bragg grating-based Fabry-Perot cavity at a pump power of ~229 mW. The pump efficiency was estimated at ~19.2%, and the impact of the variation in the cavity length with respect to the output pulse characteristics was investigated with fixed pump power. The output performance of the proposed all-fiberized laser was compared to that of Q-switched, 1.5-μm fiber lasers incorporating other types of nonlinear optical nanomaterials that had been previously proposed.