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

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

doi:10.1117/12.2287423

16 February 2018 Electro-optic tuning of potassium tantalate-niobate whispering gallery resonators

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

Proceedings Volume 10518, Laser Resonators, Microresonators, and Beam Control XX; 1051802 (2018) https://doi.org/10.1117/12.2287423
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

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/V^{2 . 1} Thus, refractive index tuning is achieved by thermal or mechanical means. Potassium tantalateniobate (KTa₁_−xNb_xO₃with 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.

Conference Presentation

Citation Download Citation

Jan Szabados, Sushanth Kini Manjeshwar, Ingo Breunig, and Karsten Buse "Electro-optic tuning of potassium tantalate-niobate whispering gallery resonators", Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 1051802 (16 February 2018); https://doi.org/10.1117/12.2287423

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