Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster: Quantum Optics and Photonics III
Q 53.74: Poster
Thursday, March 9, 2017, 17:00–19:00, P OG2
Q-switched Yb:YAG channel waveguide laser using low-dimensional carbon nanomaterials — •Sun Young Choi1, Mi Hye Kim3, Fabian Rotermund4, Christian Kränkel1,2, and Thomas Calmano1,2 — 1Institut für Laser-Physik, Universität Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Germany — 3Center for Quantum-Beam-based Radiation Research, KAERI, Republic of Korea — 4Department of Physics, KAIST, Republic of Korea
Graphene and single-walled carbon nanotubes (SWCNTs) are frequently used for saturable absorbers which can be applied for short pulse lasers. Intrinsic nonlinear absorption in a broad spectral range and few ps response time of these materials guarantee good performance. Moreover, their relatively simple fabrication process provides flexibility and makes these devices suitable for integrated systems such as waveguide lasers. We demonstrate efficient pulsed Yb:YAG channel waveguide lasers using low-dimensional carbon nanomaterials. A 9 mm-long, fs-laser-inscribed Yb:YAG channel waveguide laser delivers stable Q-switched pulses around 1030 nm output wavelength utilizing graphene or SWCNT-coated output coupling mirrors. In this way, a maximum average output power of 80 mW and 79 ns pulse duration were obtained at a efficiency of up to 33% using a graphene-coated 20% output coupler under pumping with 285 mW from a laser diode. In additional experiments, atomically thin layered graphene was applied directly on the end-facet of the channel waveguide to achieve a compact and monolithic Q-switched waveguide laser system.