It is shown that the sensitivity of a highly sensitive homodyne timing measurement scheme with femtosecond (fs) lasers [Phys. Rev. Lett. 101, 123601 (2008).] is limited by carrier-envelope-phase (CEO) noise. We describe the use of a broadband passive cavity to analyze the phase noise of a Ti:Sapphire oscillator relative to the standard quantum limit. This cavity also filters the lowest levels of classical noise at sidebands above 100 kHz detection frequency. Leading to quantum-limited CEO-phase noise at millisecond time scales, it can improve the sensitivity of the homodyne pulse timing measurement by 10 dB.
© 2014 Optical Society of America
Original Manuscript: February 5, 2014
Revised Manuscript: April 8, 2014
Manuscript Accepted: April 29, 2014
Published: June 11, 2014
Roman Schmeissner, Valerian Thiel, Clément Jacquard, Claude Fabre, and Nicolas Treps, "Analysis and filtering of phase noise in an optical frequency comb at the quantum limit to improve timing measurements," Opt. Lett. 39, 3603-3606 (2014)