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arXiv 1211.2255physics.optics
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混合电光调制微梳

Hybrid Electro-Optically Modulated Microcombs

Pascal Del'Haye, Scott B. Papp, Scott A. Diddams

摘要:

基于锁模激光器的光学频率梳已被证明是精密光谱和计量领域广泛应用的宝贵工具。近年来发展了一种在回音壁模式微谐振器(“微梳”)中产生光学频率梳的新原理,这为这些器件的芯片级集成和实验室外使用提供了一条很有前途的途径。目前,已经证明了两个家庭的微梳:电子检测模式间距,可以直接稳定的梳,和宽带梳高达倍频程跨越光谱,但模式间距超过电子检测限。然而,还不可能同时实现这两个关键要求,这对于大多数微梳应用来说是至关重要的。在这里,我们提出了一个关键的步骤,以克服这个问题,通过交错的电光梳的光谱从参量微梳。这使得首次能够直接控制和稳定具有大模间距(>140 GHz)的微梳光谱,而无需额外的锁模激光频率梳。获得的微梳梳间距的剩余1秒不稳定性为10^-15,在140 GHz模间距下微波参考极限绝对不稳定性为10^-12。

英文摘要:

Optical frequency combs based on mode-locked lasers have proven to be invaluable tools for a wide range of applications in precision spectroscopy and metrology. A novel principle of optical frequency comb generation in whispering-gallery mode microresonators ("microcombs") has been developed recently, which represents a promising route towards chip-level integration and out-of-the-lab use of these devices. Presently, two families of microcombs have been demonstrated: combs with electronically detectable mode spacing that can be directly stabilized, and broadband combs with up to octave-spanning spectra but mode spacings beyond electronic detection limits. However, it has not yet been possible to achieve these two key requirements simultaneously, as will be critical for most microcomb applications. Here we present a key step to overcome this problem by interleaving an electro-optic comb with the spectrum from a parametric microcomb. This allows, for the first time, direct control and stabilization of a microcomb spectrum with large mode spacing (>140 GHz) with no need for an additional mode-locked laser frequency comb. The attained residual 1-second-instability of the microcomb comb spacing is 10^-15, with a microwave reference limited absolute instability of 10^-12 at a 140 GHz mode spacing.

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