We present theoretical results that demonstrate a new technique that can be used to improve the sensitivity of thermal noise measurements: intracavity intensity stabilization. It is demonstrated that electro-optic feedback can be used to reduce intracavity intensity fluctuations, and the consequent radiation pressure fluctuations, by a factor of 2 below the quantum-noise limit. We show that this reduction is achievable in the presence of large classic intensity fluctuations in the incident laser beam. The benefits of this scheme are a consequence of the sub-Poissonian intensity statistics of the field inside a feedback loop and the quantum nondemolition nature of radiation pressure noise as a readout system for the intracavity intensity fluctuations.
© 1999 Optical Society of America
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
Ben C. Buchler, Malcolm B. Gray, Daniel A. Shaddock, Timothy C. Ralph, and David E. McClelland, "Suppression of classic and quantum radiation pressure noise by electro-optic feedback," Opt. Lett. 24, 259-261 (1999)