Pulse Measurement Techniques for Fiber Optics

光纤脉冲测量技术

• 批准号: 1609808
• 负责人: Rick Trebino
• 金额: $ 37万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-15 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1609808&HistoricalAwards=false
• 关键词: Pulse; Measurement; Techniques; Fiber; Optics

Title: Two New Laser Pulse-Measurement Techniques for Fiber Optics: Measuring Ultraweak Ultrashort Pulses and Spatio-Temporally Complex Multi-Spatial-Mode PulsesNon-Technical Description: This project will involve developing two laser pulse-measurement techniques to solve two important unsolved problems in fiber optics and fiber lasers. The first will solve the long-standing problem of the development of an ultrasensitive pulse-measurement technique for very low-energy and relatively long laser pulses-pulses with very low intensities. Such pulses occur in essentially all telecommunications environments, but also in many other fields. The second measurement technique is for the fiber-mode-dispersion problem: different spatial modes propagate at different velocities in a fiber and so require a complete spatiotemporal light-measurement technique. The proposed technique simultaneously generates many different-color holograms on a single camera frame and will also be simple, fast, and convenient.Technical Description: Current pulse-measurement techniques must use a thin nonlinear-optical crystal, whose output scales as the square of the intensity and crystal thickness and so yields a weak output beam. The first proposed technique will instead use a very thick nonlinear-optical crystal, much longer than is possible in other techniques, in a novel manner to yield much higher efficiency. This crystal also simultaneously spectrally resolves the generated pulse. Collinear, orthogonally polarized beams and a Type II crystal will also be required. The second proposed technique generates multiple holograms simultaneously, one for each wavelength in the pulse. Because a hologram using single-wavelength light can yield the complete spatial electric field of a beam, generating many holograms, one for each wavelength, coupled with a complete measurement of the reference pulse, yields the complete spatio-spectral and spatio-temporal electric field of even complex multi-mode light. Even better, it can do so using only a single camera frame. Additional frames using additional delays between the unknown and reference pulses can extend the range to arbitrarily large delays and numbers of modes. Both techniques will be very inexpensive, compact, experimentally simple to build and use, and easily constructed from off-the-shelf components.

标题：两种新型光纤激光脉冲测量技术：测量超弱超短脉冲和时空复杂多空间模式脉冲非技术描述：该项目将涉及开发两种激光脉冲测量技术，以解决光纤光学和光纤激光器中两个重要的未解决问题。第一个将解决开发超灵敏脉冲测量技术的长期存在的问题，该技术适用于非常低能量和相对较长的激光脉冲（强度非常低的脉冲）。此类脉冲基本上出现在所有电信环境中，但也出现在许多其他领域。 第二种测量技术用于解决光纤模式色散问题：不同的空间模式在光纤中以不同的速度传播，因此需要完整的时空光测量技术。所提出的技术可以在单个相机框架上同时生成许多不同颜色的全息图，并且简单、快速、方便。 技术描述：当前的脉冲测量技术必须使用薄的非线性光学晶体，其输出按强度和晶体厚度的平方缩放，因此产生微弱的输出光束。第一种提出的技术将使用非常厚的非线性光学晶体，比其他技术中可能的晶体长得多，以一种新颖的方式产生更高的效率。该晶体还同时对生成的脉冲进行光谱解析。还需要共线、正交偏振光束和 II 型晶体。第二种提出的技术同时生成多个全息图，每个全息图对应脉冲中的每个波长。由于使用单波长光的全息图可以产生光束的完整空间电场，因此可以生成许多全息图，每个波长一个，再加上参考脉冲的完整测量，甚至可以产生复杂多模光的完整时空光谱和时空电场。更好的是，它可以仅使用单个相机框架来实现这一点。使用未知脉冲和参考脉冲之间的附加延迟的附加帧可以将范围扩展到任意大的延迟和模式数量。这两种技术都非常便宜、紧凑、在实验上易于构建和使用，并且很容易用现成的组件构建。