A New Bound on Excess Frequency Noise in Second Harmonic Generation in PPKTP at the 10^-19 Level

Abstract

We report a bound on the relative frequency fluctuations in nonlinear second harmonic generation. A 1064nm Nd:YAG laser is used to read out the phase of a Mach-Zehnder interferometer while PPKTP, a nonlinear crystal, is placed in each arm to generate second harmonic light. By comparing the arm length difference of the Mach Zehnder as read out by the fundamental 1064 nm light, and its second harmonic at 532 nm, we can bound the excess frequency noise introduced in the harmonic generation process. We report an amplitude spectral density of frequency noise with total RMS frequency deviation of 3mHz and a minimum value of 20 μHz/rtHz over 250 seconds with a measurement bandwidth of 128 Hz, corresponding to an Allan deviation of 10^-19 at 20 seconds.

Submitted to Optics Express June 2012

References in corpus (5)

• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• Phase- coherent comparison of two optical frequency standards over 146 km using a telecommunication fiber link
• Fluctuation-dissipation theorem for thermo-refractive noise
• Arm-length stabilisation for interferometric gravitational-wave detectors using frequency-doubled auxiliary lasers
• Negative optical inertia for enhancing the sensitivity of future gravitational-wave detectors

Cited by in corpus (7)

• Correlated noise in networks of gravitational-wave detectors: subtraction and mitigation
• Frequency stability of a wavelength meter and applications to laser frequency stabilization
• Multi-color Cavity Metrology
• An arm length stabilization system for KAGRA and future gravitational-wave detectors
• Residual Phase Noise Measurement of Optical Second Harmonic Generation in PPLN Waveguides
• Experimental demonstration of frequency downconverted arm length stabilization for a future upgraded gravitational wave detector
• Feedforward Cancellation of High-Frequency Phase Noise in Frequency-Doubled Lasers