High optical gain in erbium-doped potassium double tungstate channel waveguide amplifiers.

Author(s) Vázquez-Córdova, S.A.; Aravazhi, S.; Grivas, C.; Yong, Y.S.; García-Blanco, S.M.; Herek, J.L.; Pollnau, M.
Journal Opt Express
Date Published 2018 Mar 05

We report on the optical-gain properties of channel waveguides patterned into lattice-matched KGdxLuyErxy(WO) layers grown onto undoped KY(WO) substrates by liquid phase epitaxy. A systematic investigation of gain is performed for five different Er concentrations in the range of 0.75 to 10at.% and different pump powers and signal wavelengths. In pump-probe-beam experiments, relative internal gain, i.e., signal enhancement minus absorption loss of light propagating in the channel waveguide, is experimentally demonstrated, with a maximum value of 12 ± 5 dB/cm for signals at the peak-emission wavelength of 1534.7 nm.

DOI 10.1364/OE.26.006260
ISSN 1094-4087
Citation Opt Express. 2018;26(5):62606266.

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