We present what we believe to be the first fiber laser system that is actively mode-locked by a deformable micromirror. The micromirror device is placed within the laser cavity and performs a dual function of modulator and end-cavity mirror. The mode-locked laser provides ~1-ns-long pulses with 20 nJ/pulse energy at 5 MHz repetition rates.
"Additional functionality in achieving multiple Q-switched beams from a single gain medium is also made possible . MEMS Q-switched solid-state and fiber lasers have been demonstrated using various MEMS actuation techniques: scanning micromirrors  , a cantilever mirror , a piezoelectric polymer vibrating mirror , and a membrane mirror . We have recently reported the incorporation of scanning micromirrors within Nd:YAG laser cavities. "
[Show abstract][Hide abstract] ABSTRACT: Active control of output power and transverse intensity profile of a continuous-wave Nd:YAG laser is reported. This was achieved by controlling the surface profile of an intracavity MEMS device through active tuning of its temperature.
Advanced Solid State Lasers, Shanghai, China; 11/2014
"Similarly single ,  and multiple  Q-switched outputs of solid-state lasers have been demonstrated with pulse energies reaching 36µJ and minimum pulse durations of 30ns. A combination of active and passive Q-switching of a microchip laser to achieve sub-nanosecond pulse durations has also been reported , as well as mode-locked pulse operation of a fiber laser using a membrane deformable mirror . "
[Show abstract][Hide abstract] ABSTRACT: The output behavior of a Nd:YAG solid-state laser actively Q-switched by a MEMS scanning micromirror is presented. Using a gold-coated micromirror, maximum average output powers of 50mW and pulse durations as short as 120ns were obtained with a dual beam output. This output pattern originates from a pulse emission when the micromirror is at an angle from the cavity axis. The temporal and spatial behavior of this laser was experimentally characterized and then modelled using a numerical simulation of the laser rate equations. Finally, prospects for power-scaling this MEMS-based Q-switch technique are demonstrated using a dielectric-coated micromirror, which led to average output powers of up to 650mW and pulse energies above 40µJ.
IEEE Journal of Selected Topics in Quantum Electronics 08/2014; 21(1):1-8. DOI:10.1109/JSTQE.2014.2345700 · 2.83 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Presented herein is the use of an ultrafast Si-based variable optical attenuator (VOA) as a Q-switch for rare earth-doped fiber lasers. The ultrafast VOA is based on a forward-biased p-i-n diode integrated with a ridge waveguide, which was originally designed and optimized for WDM channel power equalization in optical communication systems. By incorporating a Si-based VOA with a transient time of ~410 ns into an erbium-doped fiber-based Fabry-Perot cavity it has been shown that stable Q-switched pulses possessing a temporal width of less than ~86 ns can be readily obtained at a repetition rate of up to ~1 MHz. The laser's peak power of ~38 W is shown to be obtainable at 20 kHz with a slope efficiency of ~21%.
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