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arXiv 1902.01604physics.optics
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全稳相量子级联laser频率梳

Fully phase-stabilized quantum cascade laser frequency comb

Luigi Consolino, Malik Nafa, Francesco Cappelli, Katia Garrasi, Francesco P. Mezzapesa, Lianhe Li, A. Giles Davies, Edmund H. Linfield, Miriam S. Vitiello, Paol… 展开作者

Luigi Consolino, Malik Nafa, Francesco Cappelli, Katia Garrasi, Francesco P. Mezzapesa, Lianhe Li, A. Giles Davies, Edmund H. Linfield, Miriam S. Vitiello, Paolo De Natale, Saverio Bartalini

摘要:

光学频率梳合成器(FC)[1]是一种覆盖宽光谱范围的激光源,具有许多离散的、等间隔的和高度相干的频率分量,仅通过两个参数完全控制:相邻模式之间的频率间隔和载波偏移频率。FC在光学和微波/射频区域之间提供相位相干链路[2],已成为精密测量的突破性工具[3,4]。尽管有这些固有的优点,但到目前为止,开发跨整个红外(IR)的小型化梳状源,并在一个水平上独立且同时控制两个梳状自由度是不可能的。最近,已经用紧凑的光源,即二极管激光泵浦的微谐振器[5,6]和量子级联激光器(QCL梳)[7,8]获得了有希望的结果。虽然这两种光源都依赖于四波混频(FWM)来产生梳状频率模式,但QCL梳状结构受益于mm级小型化占地面积,并通过量子工程在3-250 μm范围内对光谱发射进行特别定制[9]。在这里,我们展示了完全稳定和控制的两个关键参数的QCL梳对主频率标准。我们的技术在这里应用于远红外发射器,并对其他光谱窗口开放,可以实现单个梳状模式的Hz级窄化,以及对其单个频率的计量级调谐,同时测量精度为2x 10 ^-12,受所用频率参考的限制。由于增益介质的量子性质,这些完全受控、频率可扩展、超紧凑的梳状发射器有望渗透越来越多的中红外和远红外应用,包括量子技术[10]。

英文摘要:

Optical frequency comb synthesizers (FCs) [1] are laser sources covering a broad spectral range with a number of discrete, equally spaced and highly coherent frequency components, fully controlled through only two parameters: the frequency separation between adjacent modes and the carrier offset frequency. Providing a phase-coherent link between the optical and the microwave/radio-frequency regions [2], FCs have become groundbreaking tools for precision measurements[3,4]. Despite these inherent advantages, developing miniaturized comb sources across the whole infrared (IR), with an independent and simultaneous control of the two comb degrees of freedom at a metrological level, has not been possible, so far. Recently, promising results have been obtained with compact sources, namely diode-laser-pumped microresonators [5,6] and quantum cascade lasers (QCL-combs) [7,8]. While both these sources rely on four-wave mixing (FWM) to generate comb frequency patterns, QCL-combs benefit from a mm-scale miniaturized footprint, combined with an ad-hoc tailoring of the spectral emission in the 3-250 μm range, by quantum engineering [9]. Here, we demonstrate full stabilization and control of the two key parameters of a QCL-comb against the primary frequency standard. Our technique, here applied to a far-IR emitter and open ended to other spectral windows, enables Hz-level narrowing of the individual comb modes, and metrological-grade tuning of their individual frequencies, which are simultaneously measured with an accuracy of 2x10^-12, limited by the frequency reference used. These fully-controlled, frequency-scalable, ultra-compact comb emitters promise to pervade an increasing number of mid- and far-IR applications, including quantum technologies, due to the quantum nature of the gain media [10].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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