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

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