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Modeling compact high power fiber lasers and vecsels.

机译：为紧凑型高功率光纤激光器和船只建模。

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摘要

Compact high power fiber lasers and the vertical-external-cavity surface-emitting lasers (VECSELs) are promising candidates for high power laser sources with diffraction-limited beam quality and are currently the subject of intensive research and development. Here three large mode area fiber lasers, namely, the photonic crystal fiber (PCF) laser, the multicore fiber (MCF) laser, and the multimode interference (MMI) fiber laser, as well as the VECSEL are modeled and designed.;For the PCF laser, the effective refractive index and the effective core radius of the PCF are investigated using vectorial approaches and reformulated. Then, the classical step-index fiber theory is extended to PCFs, resulting in a highly efficient vectorial effective-index method for the design and analysis of PCFs. The new approach is employed to analyze the modal properties of the PCF lasers with depressed-index cores and to effectively estimate the number of guided modes for PCFs.;The MCF laser, consisting of an active MCF and a passive coreless fiber, is modeled using the vectorial mode expansion method developed in this work. The results illustrate that the mode selection in the MCF laser by the coreless fiber section is determined by the MMI effect, not the Talbot effect. Based on the MMI and self-imaging in multimode fibers, the vectorial mode expansion approach is employed to design the first MMI fiber laser demonstrated experimentally.;For the design and modeling of VECSELs, the optical, thermal, and structural properties of common material systems are investigated and the most reliable material models are summarized. The nanoscale heat transport theory is applied for the first time, to the best of my knowledge, to design and model VECSELs. In addition, the most accurate strain compensation approach is selected for VECSELs incorporating strained quantum wells to maintain structural stability. The design principles for the VECSEL subcavity are elaborated and applied to design a 1040nm VECSEL subcavity that has been demonstrated for high power operation of VECSELs where near diffraction-limited output over 20 W is obtained. Physical modeling of the VECSEL is also discussed and used to compare VECSEL subcavity designs on the laser level.
机译：紧凑型高功率光纤激光器和垂直外腔表面发射激光器（VECSEL）是具有受限衍射光束质量的高功率激光源的有前途的候选者，并且目前是深入研究和开发的主题。在此建模和设计了三种大模场光纤激光器，分别是光子晶体光纤（PCF）激光器，多芯光纤（MCF）激光器和多模干涉（MMI）光纤激光器以及VECSEL。使用矢量方法研究PCF激光器，PCF的有效折射率和有效纤芯半径并重新制定。然后，经典的阶跃折射率纤维理论被扩展到PCFs，从而产生了一种用于PCFs设计和分析的高效矢量有效折射率方法。该新方法用于分析具有下折射率纤芯的PCF激光器的模态特性，并有效地估计PCF的导模数。; MCF激光器由有源MCF和无源无芯光纤组成，使用在这项工作中开发的矢量模式扩展方法。结果表明，无芯光纤段在MCF激光器中的模式选择是由MMI效应决定的，而不是由Talbot效应决定的。基于多模光纤中的MMI和自成像，采用矢量模式扩展方法设计实验证明的第一台MMI光纤激光器。对于VECSEL的设计和建模，常用材料系统的光学，热和结构特性进行了调查，并总结了最可靠的材料模型。据我所知，纳米尺度的热传输理论首次被用于设计和建模VECSEL。此外，为包含应变量子阱的VECSEL选择了最精确的应变补偿方法，以保持结构稳定性。详细阐述了VECSEL子腔的设计原理，并将其应用于设计1040nm VECSEL子腔，该腔已被证明可用于VECSEL的高功率工作，并获得了超过20 W的近衍射极限输出。还讨论了VECSEL的物理建模，并将其用于在激光水平上比较VECSEL子腔设计。

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  • 作者

    Li, Hongbo.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 215 p.
  • 总页数 215
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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