Fescenko, I.Alnis, J.Schliesser, A.Wang, C. Y.Kippenberg, T. J.Haensch, T. W.2013-02-272013-02-272013-02-27201210.1364/OE.20.019185https://infoscience.epfl.ch/handle/20.500.14299/89670WOS:000307873600069Frequency 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 Americatext::journal::journal article::research article