Abstract
We demonstrate a tunable hybrid Graphene-Nd:YAG cladding waveguide laser exploiting the electro-optic and the Joule heating effects of Graphene. A cladding Nd:YAG waveguide was fabricated by the ion irradiation. The multi-layer graphene were transferred onto the waveguide surface as the saturable absorber to get the Q-switched pulsed laser oscillation in the waveguide. Composing with appropriate electrodes, graphene based capacitance and heater were formed on the surface of the Nd:YAG waveguide. Through electrical control of graphene, the state of the hybrid waveguide laser was turned on or off. And the laser operation of the hybrid waveguide was electrically tuned between the continuous wave laser and the nanosecond pulsed laser.
Highlights
We demonstrate a tunable hybrid Graphene-Nd:YAG cladding waveguide laser exploiting the electrooptic and the Joule heating effects of Graphene
Multilayer graphene was coated onto the surface of the Nd:YAG waveguide, which composed a hybrid Nd:YAG waveguide
Due to the saturation absorption of graphene, the Q-switched pulsed laser was generated in the Nd:YAG waveguide under the 810 nm laser pumping
Summary
We demonstrate a tunable hybrid Graphene-Nd:YAG cladding waveguide laser exploiting the electrooptic and the Joule heating effects of Graphene. The multi-layer graphene were transferred onto the waveguide surface as the saturable absorber to get the Q-switched pulsed laser oscillation in the waveguide. Graphene can be used as an efficient saturable absorber (SA) in a laser system for the generation of ultrafast lasers[4,5,6,7] Another fascinating feature is that the Fermi level of a graphene layer can be tuned by electrical signals[4,8,9,10,11,12,13]. Multi-layer (4 layers) graphene and electrodes were coated onto the surface of a Nd:YAG cladding waveguide, constituting a graphene-based capacitance or an electric heater (depending on the connection of the electrical circuit). Switching the electrical circuit to the electrical heater, the “on or off ” state of the waveguide laser was electrically controlled
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