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arXiv · 1501.02324

Barium fluoride whispering-gallery-mode disk-resonator with one billion quality-factor

Guoping Lin·Souleymane Diallo·Rémi Henriet·Maxime Jacquot·Yanne K. Chembo
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Abstract

We demonstrate a monolithic optical whispering gallery mode resonator fabricated with barium fluoride (BaF$_2$) with an ultra-high quality ($Q$) factor above $10^9$ at $1550$ nm, and measured with both the linewidth and cavity-ring-down methods. Vertical scanning optical profilometry shows that the root mean square surface roughness of $2$ nm is achieved for our mm-size disk. To the best of our knowledge, we show for the first time that one billion $Q$-factor is achievable by precision polishing in relatively soft crystals with mohs hardness of ~$3$. We show that complex thermo-optical dynamics can take place in these resonators. Beside usual applications in nonlinear optics and microwave photonics, high energy particle scintillation detection utilizing monolithic BaF$_2$ resonators potentially becomes feasible.

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Guoping Lin, Souleymane Diallo, Rémi Henriet, Maxime Jacquot, Yanne K. Chembo. 2015-01-10. Barium fluoride whispering-gallery-mode disk-resonator with one billion quality-factor. https://doi.org/10.1364/ol.39.006009

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