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首页> 外文学位 >Spontaneous pulsations in laser oscillators: Effects of spatial field distributions; self-mode-locking dynamics; pulsations in 3.39 micrometer helium-neon standing-wave lasers.
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Spontaneous pulsations in laser oscillators: Effects of spatial field distributions; self-mode-locking dynamics; pulsations in 3.39 micrometer helium-neon standing-wave lasers.

机译：激光振荡器中的自发脉动：空间场分布的影响；自锁模动力在3.39微米氦氖驻波激光器中产生脉动。

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摘要

Some lasers with steady-state excitation exhibit undamped pulsation outputs. In this study, rigorous models for such pulsation dynamics have been developed. These models can be used to investigate the effects of non-ideal spatial distributions of the electric field on the instability behavior.; General models for both homogeneously and inhomogeneously broadened, uni-directional ring laser oscillators with nonuniform plane-wave electric field distributions are derived. Linear stability analysis is performed on the steady-state solutions when they are subjected to small perturbations. The results show that the inclusion of a nonuniform plane-wave electric field distribution tends to raise the perturbation instability threshold above that of laser models with a uniform plane-wave electric field.; A laser model that describes spontaneous self-mode-locking dynamics in long-cavity mixed-broadened unidirectional ring laser oscillators is developed. The general model, for lasers with different gain media and cavity lengths, allows for investigations of pulsation dynamics in lasers with discrete losses, where the arbitrary coupling loss at the output mirror and other losses in the system are considered separately. When applied to a specific laser, i.e., a xenon laser, for which published experimental data at various cavity lengths and pump rates is available, the results of the numerical calculations show rich pulsation behavior similar to those observed experimentally.; Spontaneous pulsations have been observed in single-mode standing-wave 3.39μm He-Ne laser oscillators. A model for this effect is reported, and the results include direct comparisons between theoretically calculated results and published data for this type of laser. Good agreement is obtained for both the threshold for instability and the corresponding peak pulsation frequency. Other previously reported features, such as the complex structures of the homodyne and heterodyne spectra as the threshold parameter or the cavity detuning is varied, the narrow range of pulsations around the line center, anomalous mode-pulling behavior, and the varying depth and the width of the Lamb dip are all in agreement with the theoretical results.
机译：一些具有稳态激发的激光器表现出无阻尼的脉动输出。在这项研究中，已经为这种脉动动力学建立了严格的模型。这些模型可以用来研究电场的非理想空间分布对不稳定性行为的影响。推导了具有不均匀平面波电场分布的均匀和不均匀加宽的单向环形激光振荡器的通用模型。当它们受到小的扰动时，对稳态解进行线性稳定性分析。结果表明，包含不均匀的平面波电场分布倾向于使扰动不稳定性阈值高于具有均匀平面波电场的激光模型的扰动不稳定性阈值。建立了描述长腔混合扩展单向环形激光振荡器中自发自锁模动力学的激光模型。对于具有不同增益介质和腔长度的激光器，该通用模型允许研究具有离散损耗的激光器中的脉动动力学，其中分别考虑了输出镜的任意耦合损耗和系统中的其他损耗。当应用于特定的激光器，即氙激光器时，可获得公开的各种腔长和泵浦速率的实验数据，数值计算结果显示出丰富的脉动行为，与实验观察到的类似。在单模驻波3.39μmHe-Ne激光振荡器中观察到自发脉动。报告了这种效果的模型，结果包括该类型激光器的理论计算结果与公开数据之间的直接比较。对于不稳定的阈值和相应的峰值脉动频率都获得了良好的一致性。其他先前报告的特征，例如，作为阈值参数的零差和外差光谱的复杂结构或腔失谐发生变化，线心周围的脉动范围窄，异常的模式牵引行为以及变化的深度和宽度羔羊肉的浸出量与理论结果完全一致。

著录项

  • 作者

    Chenkosol, Pitak.;

  • 作者单位

    Portland State University.;

  • 授予单位 Portland State University.;
  • 学科 Engineering Electronics and Electrical.; Physics Optics.; Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 200 p.
  • 总页数 200
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;
  • 关键词

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