17 February 2017 Er:YGG planar waveguides grown by pulsed laser deposition for LIDAR applications
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Er:YGG planar waveguide amplifiers (PWAs) are promising candidates to meet the needs of greenhouse-gas differentialabsorption LIDAR applications. We report pulsed–laser-deposition growth of this doped crystal and net-gain performance (internal gain ~2 dB/cm for 0.7-at.% Er-doping) in a 0.9-cm-long uncoated single-pass PWA. Rapid fabrication is also demonstrated with optimized parameters, where crystal growth rates approaching 20 microns/hour have been realized. We compare Er-doping concentrations ranging from 0.5 at.% - 4 at.%, and report on their spectroscopic properties. Furthermore, we show the ability to tailor the deposited crystal properties, controlling the waveguide and gain characteristics. Finally, we discuss the spectroscopy and potential performance of this relatively unstudied material for PWAs in the eye-safe regime.
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Jacob I. Mackenzie, James A. Grant-Jacob, Stephen Beecher, Haris Riris, Anthony W. Yu, David P. Shepherd, and Robert W. Eason "Er:YGG planar waveguides grown by pulsed laser deposition for LIDAR applications", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100820A (17 February 2017); doi: 10.1117/12.2256972; https://doi.org/10.1117/12.2256972

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