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Publication
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Frequency stabilization of a diode laser locked to a whispering gallery mode (WGM) reference resonator made of a MgF2 single crystal is demonstrated. The strong thermal dependence of the difference frequency between two orthogonally polarized TE an TM modes (dual-mode frequency) of the optically anisotropic crystal material allows sensitive measurement of the resonator's temperature within the optical mode volume. This dual-mode signal was used as feedback for self-referenced temperature stabilization to nanokelvin precision, resulting in frequency stability of 0.3 MHz/h at 972 nm, which was measured by comparing with an independent ultrastable laser. (C) 2012 Optical Society of America
Luis Guillermo Villanueva Torrijo, Soumya Yandrapalli, Victor Plessky
Tobias Kippenberg, Nikolai Kuznetsov, Alisa Davydova, Alberto Nardi, Miles Henry Anderson