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首页> 外文学位 >Optical processes and laser dynamics in holmium and neodymium upconversion-pumped visible and ultraviolet fluorozirconate fiber lasers.
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Optical processes and laser dynamics in holmium and neodymium upconversion-pumped visible and ultraviolet fluorozirconate fiber lasers.

机译：和钕上转换泵浦的可见和紫外氟锆酸盐光纤激光器的光学过程和激光动力学。

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摘要

Upconversion-pumped, rare-earth-doped fluorozirconate glass fiber lasers are of interest because of their potential as compact visible or ultraviolet laser sources. This thesis describes studies of three upconversion-pumped fluorozirconate fiber lasers: a Ho3+ 550 nm laser pumped at 645 nm, and two Nd3+ lasers operating at 381 and 412 nm, both pumped at 590 nm.; Spectroscopic studies of the Ho3+ system presented in this thesis were aimed at identifying the processes involved in the upconversion-pumping process. Absorption spectra of Ho3+-doped fluorozirconate glass and emission spectra of Ho3+-doped fluorozirconate bulk glass and fiber obtained using various pump schemes have been used to identify the levels involved and to calculate the transition strengths between the levels. Absorption and emission cross-section spectra for several transitions have been calculated. The holmium fiber laser has been characterized extensively. The dependence of fiber laser performance on fiber length, fiber core size and cavity output coupling is reported. In addition, the wavelength tuning, pump wavelength dependence, and transient characteristics have been explored. Examination of the transient behavior of the laser shows a sustained periodic (∼25 kHz) oscillation in the output power due to competition between transitions originating from the 5F4 level and those originating from the 5S2 level. Excited state absorption near 550 nm from the 5F4 and 5S2 manifolds has been observed. A computational model has been developed to predict the behavior of the continuous wave operation of the holmium fiber laser. The first demonstration of diodepumping of this laser is reported.; The 381 nm upconversion-pumped fiber laser described in this thesis is the first ultraviolet fiber laser to be pumped by any means. Characteristics of this laser and the 412 nm laser, such as the laser excitation spectrum, transient behavior and laser emission spectrum, are described. Upconversion-pumped spontaneous emission from the high lying (38,800 cm-1 above ground) 2F(2)5/2 level is reported for the first time. Several upconversion pumping schemes involving single or dual pump wavelengths are described.
机译：上转换泵浦，稀土掺杂的氟锆酸盐玻璃纤维激光器是令人感兴趣的，因为它们具有作为紧凑的可见或紫外激光源的潜力。本文描述了三种上转换泵浦的氟锆酸盐光纤激光器的研究：一台Ho3 + 550 nm激光器在645 nm泵浦，以及两台Nd3 +激光器在381 nm和412 nm泵浦，两者都在590 nm泵浦。本文提出的Ho3 +系统的光谱学研究旨在确定上转换-泵浦过程中涉及的过程。使用各种泵方案获得的掺Ho3 +的氟锆酸盐玻璃的吸收光谱和掺Ho3 +的氟锆酸盐块状玻璃和纤维的发射光谱已用于识别所涉及的能级并计算该能级之间的过渡强度。已经计算了几个跃迁的吸收和发射截面光谱。 fiber光纤激光器已被广泛地表征。报告了光纤激光器性能对光纤长度，光纤纤芯尺寸和腔输出耦合的依赖性。另外，还研究了波长调谐，泵浦波长依赖性和瞬态特性。对激光器瞬态行为的检查表明，由于源自5F4能级的跃迁和源自5S2能级的跃迁之间存在竞争，因此输出功率会出现持续的周期性（〜25 kHz）振荡。已经观察到5F4和5S2歧管在550 nm附近激发态吸收。已经开发出计算模型来预测光纤激光器的连续波操作的行为。报告了该激光器的二极管泵浦的首次演示。本文描述的381 nm上转换泵浦光纤激光器是第一台以任何方式泵浦的紫外光纤激光器。描述了该激光器和412 nm激光器的特性，例如激光激发光谱，瞬态行为和激光发射光谱。首次报告了高转换（地面以上38,800 cm-1）2F（2）5/2水平的上转换泵自发发射。描述了涉及单或双泵浦波长的几种上变频泵浦方案。

著录项

  • 作者

    Funk, David Stathem.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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