Deschênes Jean-Daniel, Giaccarri Philippe, Genest Jérôme
Centre d’Optique, Photonique et Laser, 2375 rue de la Terrasse, Université Laval, Québec, Québec, Canada.
Opt Express. 2010 Oct 25;18(22):23358-70. doi: 10.1364/OE.18.023358.
This paper presents a significant advancement in the referencing technique applied to frequency comb spectrometry (cFTS) that we proposed and demonstrated recently. Based on intermediate laser oscillators, it becomes possible to access the full delay range set by the repetition rate of the frequency combs, overcoming the principal limitation observed in the method based on passive optical filters. With this new referencing technique, the maximum spectral resolution given by each comb tooth is achievable and continuous scanning will improve complex reflectometry measurements. We present a demonstration of such a high resolution cFTS system, providing a spectrometry measurement at 100 MHz of resolution (0.003 cm(-1)) with a spectral signal to noise ratio of 440 for a 2 seconds measurement time. The resulting spectrum is composed of 105 · 10(3) resolved spectral elements, each corresponding to a single pair of optical modes (one for each combs). To our knowledge, this represents the first cFTS measurement over the full spectral range of the sources in a single shot with resolved individual modes at full resolution.
本文展示了我们最近提出并演示的应用于频率梳光谱技术（cFTS）的参考技术的重大进展。基于中间激光振荡器，可以访问由频率梳的重复率设置的完整延迟范围，克服了基于无源光学滤波器的方法中观察到的主要限制。有了这种新的参考技术，每个梳齿给出的最大光谱分辨率是可以实现的，并且连续扫描将改善复杂反射测量。我们展示了这样一个高分辨率cFTS系统，在2秒的测量时间内，以100 MHz的分辨率（0.003 cm⁻¹）提供光谱测量，光谱信噪比为440。所得光谱由105·10³个分辨的光谱元素组成，每个元素对应于一对光学模式（每个梳有一个）。据我们所知，这代表了首次在单次测量中对源的整个光谱范围进行全分辨率分辨单个模式的cFTS测量。
