Analysis and filtering of phase noise in an optical frequency comb at the quantum limit to improve timing measurements

摘要

The sensitivity of homodyne timing measurements with femtosecond lasers isonly limited by the amplitude and phase noise. We describe a novel method toanalyze the phase noise of a Ti:Sapph oscillator relative to the standardquantum limit. The broadband passive cavity used to this aim also filterslowest levels of classical noise at sidebands above 100kHz detection frequency.Leading to quantum limited carrier-envelope-phase noise at $\mu$s-timescales,it can improve the sensitivity of a highly sensitive, homodyne timing jittermeasurement by 2 orders of magnitude.