Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 7: Präzisionsmessungen und Metrologie 3

A 7.4: Talk

Monday, March 12, 2012, 17:15–17:30, V7.03

Precision phase measurement of an optical resonator with a high FSR squeezer — •Timo Denker, Maximilian Wimmer, Dirk Schütte, and Michèle Heurs — Albert-Einstein Institut Hannover: Max-Planck-Institut für Gravitationsphysik, 30167 Hannover

For many applications using optical resonators (e.g. cavity spectroscopy) good frequency stability is required. To achieve this it is necessary to measure the phase shift of the optical resonator with high accuracy. The quality of this measurement depends on the Signal-to-noise-ratio (SNR). For the shot-noise-limited case the SNR can be increased either by increasing the signal or reducing the noise. We present an experimental scheme that makes use of the output of an optical parametric oscillator, a so-called squeezer. The cavity enhanced squeezed signal of a high free spectral range (FSR) squeezer provides a reduced noise-floor for a precision phase measurement of an optical resonator with high finesse. The phase quadrature variance is measured directly at the homodyne detector and yields a suitable error signal for frequency stabilisation.