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Phys Rev Lett. 2004 Dec 17;93(25):250602. Epub 2004 Dec 17.

Thermal-noise limit in the frequency stabilization of lasers with rigid cavities.

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Laboratory for High Energy Astrophysics, Code 663, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.


We evaluate thermal noise (Brownian motion) in a rigid reference cavity used for frequency stabilization of lasers, based on the mechanical loss of cavity materials and the numerical analysis of the mirror-spacer mechanics with the direct application of the fluctuation dissipation theorem. This noise sets a fundamental limit for the frequency stability achieved with a rigid frequency-reference cavity of order 1 Hz/ square root Hz (0.01 Hz/ square root Hz) at 10 mHz (100 Hz) at room temperature. This level coincides with the world-highest level stabilization results.

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