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arXiv 1604.08115physics.optics
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扫描微谐振腔直接梳绝对光谱法

Scanning micro-resonator direct-comb absolute spectroscopy

Alessio Gambetta, Marco Cassinerio, Davide Gatti, Paolo Laporta, Gianluca Galzerano

摘要:

直接光学频率梳光谱学(DCS)由于其在超宽带、高速检测和频率精度方面的独特性能而被证明是许多科学和技术领域的基本工具,从而允许对原子和分子能量结构进行高保真映射。本文提出了一种基于扫描法布里-珀罗微腔谐振器(SMART)的DCS方法,为求解光学频率梳的模式结构提供了一种简单、紧凑和精确的方法。SMART方法在大大降低系统复杂性的同时,允许对光频轴进行直接的绝对校准,其最终分辨率受微谐振器谐振线宽的限制,并且可以用于从XUV到THz的任何光谱区域。介绍了一个应用于乙炔在1.54 μ m的高精度光谱,演示了低至20 MHz的频率分辨率与单扫描光学带宽高达1太赫兹,在20毫秒的测量时间和噪声等效吸收水平每梳模式为2.7 × 10^-9 cm^-1 Hz^(-1/2)。使用更高的精细度的微谐振器以及增强腔,这种技术有可能提高一个以上的数量级的噪声等效吸收在一个多太赫兹的光谱间隔不变的频率分辨率。

英文摘要:

Direct optical frequency Comb Spectroscopy (DCS) is proving to be a fundamental tool in many areas of science and technology thanks to its unique performance in terms of ultra-broadband, high-speed detection and frequency accuracy, allowing for high-fidelity mapping of atomic and molecular energy structure. Here we present a novel DCS approach based on a scanning Fabry-Perot micro-cavity resonator (SMART) providing a simple, compact and accurate method to resolve the mode structure of an optical frequency comb. The SMART approach, while drastically reducing system complexity, allows for a straightforward absolute calibration of the optical-frequency axis with an ultimate resolution limited by the micro-resonator resonance linewidth and can be used in any spectral region from XUV to THz. An application to high-precision spectroscopy of acetylene at 1.54 um is presented, demonstrating frequency resolution as low as 20 MHz with a single-scan optical bandwidth up to 1 THz in 20-ms measurement time and a noise-equivalent-absorption level per comb mode of 2.7 10^-9 cm^-1 Hz^(-1/2). Using higher finesse micro-resonators along with an enhancement cavity, this technique has the potential to improve by more than one order of magnitude the noise equivalent absorption in a multiterahertz spectral interval with unchanged frequency resolution.

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