Stable 10 GHz microwave synthesis via partial optical frequency division

William A. Groman, I. Kudelin, Megan L. Kelleher, Dahyeon Lee, A. Lind, Charlie McLemore, F. Quinlan, S. Diddams
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Abstract

Synthesis of low-noise microwaves is desirable in a wide variety of scientific and engineering fields. Optical frequency division with frequency combs has been a key part in the realization of ultrastable microwave signals. However, fully self-referenced frequency combs are complex and involve several nonlinear processes for implementation of the f-2f interferometer. In this paper, we provide a novel approach for generation of ultrastable microwaves by stabilizing the comb spacing, while the offset frequency of the comb is free-running. This is achieved by mixing the beats of a frequency comb with two continuous wave (cw) lasers separated by 1.3 THz, which are PDH locked to a single reference cavity. We demonstrate the generation of stable 10 GHz microwaves with −140 dBc/Hz phase noise at 10 kHz Fourier frequency and 5·10−13 level Allan deviation instability at 0.3 s. This work projects the potential of future compact microwave generation with low power consumption.
通过部分光分频稳定的10ghz微波合成
低噪声微波的合成在许多科学和工程领域都是需要的。利用频梳进行光分频是实现超稳定微波信号的关键环节。然而,完全自参考频率梳是复杂的,涉及到几个非线性过程的实现f-2f干涉仪。在本文中,我们提供了一种新的方法来产生超稳定的微波,通过稳定梳间距,而梳的偏移频率是自由运行的。这是通过将频率梳的节拍与两个相距1.3太赫兹的连续波(cw)激光器混合来实现的,这两个激光器被PDH锁定在单个参考腔中。我们演示了在10 kHz傅立叶频率下产生稳定的10 GHz微波,相位噪声为- 140 dBc/Hz, 0.3 s时具有5·10−13级Allan偏差不稳定性。这项工作预测了未来低功耗紧凑型微波发电的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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