飞秒Laser频率梳中游标效应产生高功率超稳微波信号
Photonic Generation of High Power, Ultrastable Microwave Signals by Vernier Effect in a Femtosecond Laser Frequency Comb
摘要：
通过光学频率梳将超稳激光器的光学频率划分到微波频率范围允许产生具有前所未有的高光谱纯度和稳定性的微波信号。然而，如果不使用外部光学频率梳重复率倍增装置，则所产生的微波信号将遭受非常低的功率电平。本文报道了在双定向耦合器分插光纤环形谐振器中利用游标效应和光谱选择滤波来提高梳状重复频率和产生高功率微波的理论和实验研究。研究集中在两个选择性滤波方面：频率梳的不需要的光学模式的高抑制和传输的理想模式与尽可能低的损耗。此外，特别考虑了谐振腔输出端的频率梳稳定性和线宽的守恒。因此，一个纤维环谐振器的设计，制造和表征，并提出了一种技术来稳定谐振器的谐振梳。一个显着的功率增益实现了光子产生的拍音在10 GHz。本文还讨论了提高这种概念验证装置性能的途径。
英文摘要：
Optical frequency division of an ultrastable laser to the microwave frequency range by an optical frequency comb has allowed the generation of microwave signals with unprecedently high spectral purity and stability. However, the generated microwave signal will suffer from a very low power level if no external optical frequency comb repetition rate multiplication device is used. This paper reports theoretical and experimental studies on the beneficial use of the Vernier effect together with the spectral selective filtering in a double directional coupler add-drop optical fibre ring resonator to increase the comb repetition rate and generate high power microwaves. The studies are focused on two selective filtering aspects: the high rejection of undesirable optical modes of the frequency comb and the transmission of the desirable modes with the lowest possible loss. Moreover, the conservation of the frequency comb stability and linewidth at the resonator output is particularly considered. Accordingly, a fibre ring resonator is designed, fabricated, and characterized, and a technique to stabilize the resonator's resonance comb is proposed. A significant power gain is achieved for the photonically generated beat note at 10 GHz. Routes to highly improve the performances of such proof-of-concept device are also discussed.
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