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Publication Citation: Measurement and real-time cancellation of vibration-induced phase noise in a cavity-stabilized laser

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Author(s): Michael J. Thorpe; David R. Leibrandt; Tara M. Fortier; Till P. Rosenband;
Title: Measurement and real-time cancellation of vibration-induced phase noise in a cavity-stabilized laser
Published: August 30, 2010
Abstract: We demonstrate a method to measure and actively reduce the coupling of vibrations to the phase noise of a cavity-stabilized laser. This method uses the vibration noise of the laboratory environment rather than active drive to perturb the optical cavity. The laser phase noise is measured via a beat note with a second unperturbed ultra-stable laser while the vibrations are measured by accelerometers positioned around the cavity. A Wiener filter algorithm extracts the frequency and direction dependence of the cavity response function. Once the cavity response function is known, real-time noise cancellation can be implemented using the accelerometer measurements to predict and then cancel the laser phase fluctuations. We present real-time noise cancellation that results in a 25 dB reduction of the laser phase noise power spectral density.
Citation: Applied Physics B
Volume: 16
Pages: pp. 18744 - 18751
Keywords: laser stabilization;noise cancellation;optical cavities
Research Areas: Physics, Laser Physics, Time and Frequency
PDF version: PDF Document Click here to retrieve PDF version of paper (2MB)