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Spatiotemporal Dynamics of Multimode Optical Pulse Propagation: Route to High-Performance Ultrafast Lasers

多模光脉冲传播的时空动力学：高性能超快激光器之路

基本信息

批准号：
1912742
负责人：
Frank Wise
金额：
$ 37.73万
依托单位：
Cornell University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1912742&HistoricalAwards=false
关键词：
Spatiotemporal Dynamics Multimode Optical Pulse

项目摘要

Lasers that produce very short flashes of light (billionths of millionths of seconds in duration) can be used to observe very fast processes in nature, such as the motion of molecules or electrons. They do this in much the same way a strobe light can freeze motion on much longer time scales. In addition, such flashes of light can be used in applications such as cutting industrial materials and precise surgery.Such a laser can be made of optical fiber, which is attractive because the light is contained inside the fiber. In fibers used for this purpose to date, the core of the fiber is very small (a few millionths of a meter) and only a single pattern of the light propagates in the fiber. This pattern is what most people associate with a laser beam: a small spot that is brightest in its center. If the core of the fiber is made larger, other patterns can propagate. All of the allowed patterns overlap, so the beam that comes out is a complicated mix of them. Lasers based on multiple patterns can theoretically reach much higher powers, which are needed for applications, but the patterns must be controlled. In the last two years researchers have learned how to lock together multiple beam patterns in fiber lasers. Groups from Cornell University and the University of Central Florida will work to make lasers and other sources of short light pulses based on fibers that support many overlapping beam patterns. Instruments with new capabilities, such as much higher powers, will be developed. Graduate students who work on this project will receive theoretical and practical training, and will be prepared for diverse careers in science and technology. In an effort to increase exposure of science and enhance diversity of participants, the Cornell group will work with the 4H organization to offer workshops aimed at exposing junior-high-school students to science careers. Technical DescriptionLasers that generate ultrashort light pulses have had enormous impact in science and applications. The field of ultrafast science has been built on a foundation of short-pulse lasers based on a single transverse mode of a cavity, or optical fibers that support a single transverse mode. In fibers that support multiple transverse modes, wave propagation is inherently spatiotemporal. The generation of ultrashort light pulses in a fiber laser with many transverse modes was recently demonstrated for the first time.A group from Cornell University will work to develop lasers and optical amplifiers with new capabilities, based on multimode optical fibers. In such a laser it is possible to control both the spatial and temporal degrees of freedom of the electromagnetic field. A particularly promising direction is scaling short-pulse fiber lasers to higher powers, which are always desired for applications. Numerical simulations of candidate laser designs will be performed. Lasers will be built and compared to the simulation results. Collaborators from the University of Central Florida will provide theoretical and computational support for this effort. The limits of performance will be investigated, and lasers will be designed for optimum performance.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

产生非常短的闪光（持续时间为十亿分之一秒）的激光可以用来观察自然界中非常快的过程，例如分子或电子的运动。他们这样做的方式与频闪灯可以在更长的时间尺度上冻结运动的方式大致相同。此外，这种闪光还可以用于切割工业材料和精密手术等应用，这种激光器可以用光纤制成，因为光包含在光纤内部，所以很有吸引力。在迄今为止用于此目的的光纤中，光纤的纤芯非常小（几百万分之一米），并且只有单一模式的光在光纤中传播。这种模式是大多数人与激光束联系在一起的：一个在其中心最亮的小点。如果光纤的纤芯做得更大，其他图案就可以传播。所有允许的模式都是重叠的，所以出来的光束是它们的复杂混合。基于多模式的激光理论上可以达到更高的功率，这是应用所需要的，但模式必须受到控制。在过去的两年里，研究人员已经学会了如何在光纤激光器中将多个光束模式锁定在一起。来自康奈尔大学和中央佛罗里达大学的研究小组将致力于制造激光器和其他基于光纤的短光脉冲源，这些光纤支持许多重叠的光束模式。将开发具有新功能的仪器，例如更高功率的仪器。谁在这个项目工作的研究生将接受理论和实践培训，并将在科学和技术的各种职业生涯做好准备。为了增加科学的曝光率和提高参与者的多样性，康奈尔大学集团将与4H组织合作，提供旨在让初中生接触科学职业的研讨会。产生超短光脉冲的激光器在科学和应用方面产生了巨大的影响。超快科学领域已经建立在基于腔的单横模的短脉冲激光器或支持单横模的光纤的基础上。在支持多个横模的光纤中，波的传播本质上是时空的。最近首次展示了在具有多个横模的光纤激光器中产生超短光脉冲。康奈尔大学的一个小组将致力于开发基于多模光纤的具有新功能的激光器和光放大器。在这种激光器中，可以控制电磁场的空间和时间自由度。一个特别有前途的方向是将短脉冲光纤激光器扩展到更高的功率，这总是应用所需的。将对候选激光器设计进行数值模拟。激光器将被构建并与模拟结果进行比较。来自中央佛罗里达大学的合作者将为这一努力提供理论和计算支持。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Direct observations of thermalization to a Rayleigh–Jeans distribution in multimode optical fibres

DOI：
10.1038/s41567-022-01579-y
发表时间：
2022-04
期刊：
Nature Physics
影响因子：
19.6
作者：
H. Pourbeyram;P. Sidorenko;Fan O. Wu;N. Bender;Logan G. Wright;D. Christodoulides;F. Wise
通讯作者：
H. Pourbeyram;P. Sidorenko;Fan O. Wu;N. Bender;Logan G. Wright;D. Christodoulides;F. Wise

Megawatt pulses from an all-fiber and self-starting femtosecond oscillator

来自全光纤自启动飞秒振荡器的兆瓦脉冲