Sub-kHz lasing linewidth of a CaF<sub>2</sub> whispering gallery mode resonator passively stabilized ring laser has been observed. A detailed frequency analysis including a three-cornered-hat measurement yields a linewidth of 643Hz.
© 2012 OSA
M. C. Collodo, B. Sprenger, F. Sedlmeir, S. Svitlov, H. G. Schwefel, and L. J. Wang, "Sub-kHz Linewidth of Crystalline Whispering Gallery Mode Resonator Stabilized Ring-Laser," in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (online) (Optical Society of America, 2012), paper CTh3A.5.
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