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Development of visible ultrafast mode-locked fiber lasers

可见光超快锁模光纤激光器的研制

基本信息

批准号：
1710914
负责人：
Andy Chong
金额：
$ 30.27万
依托单位：
University of Dayton
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2021-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1710914&HistoricalAwards=false
关键词：
Development visible ultrafast mode locked

项目摘要

Abstract Title: Development of visible wavelength fiber lasers Non-Technical Description: Laser light pulses with femtosecond durations have a variety of industrial, medical and scientific applications. Notable applications are machining micro-scale devices, imaging biological samples, medical diagnostics and therapy, and materials spectroscopy. Lasers generating ultrashort optical pulses are referred as mode-locked lasers. Today, mode-locked lasers are mainly based on solid state amplifiers and optical fiber amplifiers. In comparison with solid-state lasers, mode-locked fiber lasers have the advantages of stability, compactness, efficiency and low cost. This project is to develop novel approaches to making mode-locked fiber lasers generating ultrashort femtosecond scale optical pulses at visible wavelengths. Even though mode-locked femtosecond fiber lasers have many practical advantages, a novel pulse forming principle is necessary in developing one in the visible wavelength regime. Most mode-locked lasers shape pulses require that the refractive index dispersion, called the group velocity dispersion, and fiber nonlinearity work together. However, an optical fiber in the visible regime has a very high group velocity dispersion relative to the fiber nonlinearity that hinders the formation of pulses. In this project, mode-locked femtosecond fiber lasers will be developed by manipulating unique pulse propagation phenomena at normal group velocity dispersion to form ultrashort pulses. A mode-locked fiber laser operating at visible colors will be a valuable tool for medical applications such as general microsurgeries, eye macular degeneration, etc. Graduate students will be trained for careers in laser science and technology and actively be involved in the research project. An effort will be made to recruit diverse groups to the project and to provide them with significant scientific research experiences. Undergraduate students will also participate and be exposed to the research process. With this experience they may consider pursuing future careers in science and technology. Technical Description: Mode-locked fiber lasers operating at visible wavelengths will be designed using Praseodymium (Pr)-doped fluoride fibers by manipulating the self-similar evolution and the dissipative soliton propagation in all-normal group velocity dispersion lasers. While the main theme of the project is to generate visible wavelength mode-locked pulses, femtosecond pulse generation beyond the gain bandwidth (BW) limitation will be studied. A Pr-doped fiber has a very narrow gain BW around the wavelength at 635 nm, which is insufficient to support femtosecond pulses. However, by adopting self-similar evolution, pulses with spectra much broader than the gain BW can be created and much shorter pulses can be formed than the gain BW limitation. Visible wavelength mode-locked fiber lasers are relevant for valuable scientific applications such as fluorescence lifetime imaging microscopy, time-resolved photoluminescence spectroscopy, and visible frequency combs. The successful outcome of the project will have a significant impact. The self-similar pulse formation technique can be exploited to generate ultrashort pulses at wavelengths where only continuous-wave lasers are available due to the narrow gain BW limitations. This project has the potential to extend the wavelength range of mode-locked lasers and to open the way for future applications.

摘要标题：可见波长光纤激光器的发展非技术描述：飞秒持续时间的激光脉冲具有多种工业、医疗和科学应用。值得注意的应用是加工微型设备，成像生物样品，医疗诊断和治疗，以及材料光谱学。产生超短光脉冲的激光器被称为锁模激光器。目前，锁模激光器主要基于固态放大器和光纤放大器。与固体激光器相比，锁模光纤激光器具有稳定、紧凑、高效、低成本等优点。本计画旨在发展一种新颖的方法，使锁模光纤雷射产生可见光波段的飞秒级超短光脉冲。尽管锁模飞秒光纤激光器具有许多实用的优点，但要在可见光范围内发展锁模飞秒光纤激光器，还需要一种新的脉冲形成原理。大多数锁模激光器整形脉冲需要折射率色散（称为群速度色散）和光纤非线性一起工作。然而，在可见光区中的光纤具有相对于光纤非线性的非常高的群速度色散，这阻碍了脉冲的形成。在该项目中，将通过在正常群速度色散下操纵独特的脉冲传播现象来形成超短脉冲来开发锁模飞秒光纤激光器。在可见光下工作的锁模光纤激光器将成为医学应用的宝贵工具，如普通显微外科手术，眼睛黄斑变性等。研究生将接受激光科学和技术方面的职业培训，并积极参与研究项目。将努力为该项目招募各种团体，并为他们提供重要的科学研究经验。本科生也将参与并接触到研究过程。有了这方面的经验，他们可能会考虑追求未来的职业生涯在科学和技术。技术说明：利用掺镨氟化物光纤，通过控制全正常群速度色散激光器中的自相似演化和耗散孤子传输，设计了工作在可见光波段的锁模光纤激光器。虽然该项目的主要主题是产生可见波长的锁模脉冲，飞秒脉冲产生超出增益带宽（BW）的限制将进行研究。掺Pr光纤在635 nm波长附近具有非常窄的增益BW，这不足以支持飞秒脉冲。然而，通过采用自相似演化，可以产生具有比增益BW宽得多的光谱的脉冲，并且可以形成比增益BW限制短得多的脉冲。可见波长锁模光纤激光器与有价值的科学应用相关，例如荧光寿命成像显微镜，时间分辨光致发光光谱和可见频率梳。该项目的成功将产生重大影响。自相似脉冲形成技术可以用来产生超短脉冲的波长，只有连续波激光器是由于窄增益带宽限制。该项目有可能扩展锁模激光器的波长范围，并为未来的应用开辟道路。