Collaborative Proposal: Ultrabroadband Supercontinuum Studies

合作提案：超宽带超连续谱研究

• 批准号: 0200223
• 负责人: Rick Trebino
• 金额: $ 28万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0200223&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Ultrabroadband; Supercontinuum; Studies

0200223TrebinoProbably the most exciting event in optics in the past two years has been the development of microstructure optical fiber. The dispersion properties of this fiber can be tailored to a far greater extent than conventional optical fibers. As a result, it can be used to transform commercially available, low-energy ultrashort pulses into ultrabroadband continuum light with a bandwidth of 500 THz. This light has numerous far-reaching applications in telecommunications, solid-state spectroscopy, coherent control of chemical reactions, and ultrahigh-spatial-resolution optical coherence tomography. It has already completely revolutionized the field of optical metrology.Unfortunately, techniques for working with ultrabroadband light remain in their infancy. At this stage, it is not possible to measure its properties other than the power spectrum. Pulse shaping and compression techniques, which are successful in narrowband applications, are not applicable to this type of ultrabroadband radiation. Even simple tasks such as collimating and propagating ultrabroadband light are not yet possible. For example, ultrabroadband lenses do not exist, and mirrors also fail because the diffraction angle of this light is over 60s. Furthermore, the process by which this light is created is at best poorly understood.As a result, we propose to 1) perform extensive modeling to understand the underlying mechanisms and the properties of the continuum light, 2) develop experimental techniques for its characterization, and 3) devise new techniques for manipulating and compressing this light. We will take two distinct approaches to ultrabroadband-light generation. One will utilize a standard fs Ti:Sapphire laser and microstructure optical fiber to produce continuum light with spectrum from 400 nm to 1.6 um. The second approach, which is equally promising-but as yet unexplored-will use amplified fiber lasers developed by IMRA America to generate ultra-broadband continuum in conventional telecommunications fiber in the IR: from 800 nm to 2.5 um.This ultrabroadband light is extremely complex, having a time-bandwidth product (TBP) in excess of 1000, whereas the most complex ultrashort pulse that has been completely characterized had a TBP of ~10. This latter measurement used frequency-resolved optical gating (FROG), and it pushed the FROG technique to its limits. As a result, we propose to develop a much broader-band version of FROG for measuring ultrabroadband continuum with more than two orders of magnitude of additional complexity. It will necessarily involve several innovations, including, for example, angle-dithering the nonlinear crystal for much greater bandwidth.

0200223trebinoprobiniblesion在过去两年中最令人兴奋的事件是微结构光纤的发展。该纤维的分散性能可以比常规光纤量身定制得多。结果，它可用于将市售的低能超短脉冲转化为以500 THz的带宽为超人物连续光。该光在电信，固态光谱，化学反应的相干控制和超高空间分辨率光学相干断层扫描中具有许多深远的应用。它已经完全彻底改变了光学计量学领域。不幸的是，使用超人物的光线仍在其婴儿期。 在此阶段，除了功率谱以外，不可能测量其特性。 在窄带应用中成功的脉冲塑形和压缩技术不适用于这种类型的超人行带辐射。 即使是简单的任务，例如准入和传播超级生产的光线也是不可能的。 例如，不存在超人物带镜头，镜子也失败了，因为该灯的衍射角度超过60 s。 此外，创建该光的过程充其量是最充其量的。结果，我们建议1）执行广泛的建模，以了解连续光的基本机制和特性，2）为其表征开发实验技术，3）为操纵和压缩这种灯而设计新的技术。我们将采用两种截然不同的方法来获得Ultrabroadband-Light Generation。人们将利用标准FS Ti：蓝宝石激光器和微结构光纤以从400 nm到1.6 um的光谱产生连续光。第二种方法同样令人鼓舞，但尚未探索，由imra America开发的放大纤维激光器在IR IR中产生超宽带连续性，以产生IR的传统电信纤维：800 nm至2.5 um。 TBP为〜10。后一个测量使用了频率分辨的光门控（Frog），并将青蛙技术推向其极限。结果，我们建议开发一种更广泛的青蛙版本，用于测量超速连续体，并具有两个以上的额外复杂性。它必然涉及几项创新，包括例如，将非线性晶体划分为更大的带宽。