Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter
Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter
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DOI：
10.1364/ol.388960
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发表时间：
2020-04-01
期刊：
影响因子：
3.6
通讯作者：
Dholakia, Kishan
中科院分区：
文献类型：
--
作者：
Bruce, Graham D.;O'Donnell, Laura;Dholakia, Kishan
光学科学的许多领域都需要精确测量光谱。基于激光散斑的器件可实现紧凑的波长测量，对于单波长激光场，其灵敏度可达到阿托米级。使用这种方法测量多模光谱将是有吸引力的，但目前这仅限于皮米分辨率。在这里，我们提出了一种方法，以提高分辨率和精度的散斑为基础的多波长测量。我们同时测量多个波长，在一个设备，包括一个单一的1米长的阶跃折射率多模光纤和快速相机。独立的波长分离少至1鳍检索与0.2鳍精度使用主成分分析。该方法提供了一种可行的方法来测量包含多个单独的线的稀疏光谱，并可能在量子技术和光学通信等领域的多个激光器的跟踪中找到应用。(C)2020美国光学学会
Many areas of optical science require an accurate measurement of optical spectra. Devices based on laser speckle promise compact wavelength measurement, with attometer-level sensitivity demonstrated for single wavelength laser fields. The measurement of multimode spectra using this approach would be attractive, yet this is currently limited to picometer resolution. Here, we present a method to improve the resolution and precision of speckle-based multi-wavelength measurements. We measure multiple wavelengths simultaneously, in a device comprising a single 1-m-long step-index multimode fiber and a fast camera. Independent wavelengths separated by as little as 1 fin are retrieved with 0.2 fin precision using principal component analysis. The method offers a viable way to measure sparse spectra containing multiple individual lines and may find application in the tracking of multiple lasers in fields such as quantum technologies and optical telecommunications. (C) 2020 Optical Society of America