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Electro-optic tuning of potassium tantalate-niobate whispering gallery resonators

: Szabados, Jan; Kini Manjeshwar, Sushanth; Breunig, Ingo; Buse, Karsten


Kudryashov, Alexis V. (Hrsg.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser Resonators, Microresonators, and Beam Control XX : 27 January - 1 February 2018, San Francisco, California, United States
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10518)
Paper 1051802, 7 S.
Conference "Laser Resonators, Microresonators, and Beam Control" <20, 2018, San Francisco/Calif.>
Fraunhofer IPM ()
whispering gallery modes; DC-Kerr effect; eigenfrequency tuning

Most centrosymmetric materials exhibit a neglectable electro-optic response; the Pockels coefficients are zero, while the DC-Kerr coefficients are typically small. For a standard material such as silica they are on the order of 10−22 m2/V2 . 1 Thus, refractive index tuning is achieved by thermal or mechanical means. Potassium tantalateniobate (KTa1−xNbxO3 with 0 < x < 1, KTN) is a rare exception. It offers outstandingly high DC-Kerr coefficients in the 10−15 m2/V2 range.2 In this contribution, the first-ever KTN whispering gallery resonators (WGR) are demonstrated with quality factors Q > 107 and electro-optic eigenfrequency tuning of more than 100 GHz at λ = 1040 nm for moderate field strengths of 250 V/mm. These results potentially pave the way for applications such as electro-optically tunable Kerr frequency combs.