PPKTP中二次谐波产生的过频噪声在10^-19能级上的新界
A New Bound on Excess Frequency Noise in Second Harmonic Generation in PPKTP at the 10^-19 Level
摘要：
我们报道了非线性二次谐波产生中相对频率涨落的一个界。利用1064 nm Nd：YAG激光器读出马赫-曾德尔干涉仪的相位，在干涉仪的每个臂上放置非线性晶体PPKTP产生二次谐波。通过比较由基波1064 nm光读出的马赫曾德尔的臂长差及其在532 nm处的二次谐波，我们可以限制谐波产生过程中引入的过量频率噪声。在128 Hz的测量带宽下，我们在250秒内得到了频率噪声的幅值谱密度，总均方根频偏为3 mHz，最小值为20 μHz/rtHz，对应于20秒时的艾伦频偏为10^-19。
英文摘要：
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.
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