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Ultrafast dual-gain-media neodymium:glass laser.

机译：超快双增益钕：玻璃激光器。

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摘要

This dissertation presents an experimental demonstration of an ultrafast dual-gain-media Nd:glass laser. This laser contains both the Nd:fluorophosphate glass (Schott glass LG-810) and the Nd:silicate glass (Schott glass LG-680) in a single cavity. Record-short pulses of 34 fs were generated by Kerr-lens mode-locking from the dual-gain-media Nd:glass laser as a result of the overall gain broadening. Compared with the shortest pulses generated from a single-medium Nd:glass laser, the pulse was shortened by nearly a factor of 2. Neodymium-doped glass is characterized by inhomogeneous broadening and multiple Stark-split sub-transitions. This dissertation presents a comprehensive study of passive mode-locking of inhomogeneously broadened lasers. For a broadband inhomogeneously broadened laser, mode-locking becomes unstable when the lasing spectrum exceeds the maximum lockable spectrum. This mode-locking instability due to the insufficient gain filtering does not appear in homogeneously broadened lasers. The mode-locking by the pure self-amplitude modulation is essentially a phase-locking process. The soliton mode-locking resists best the impact of insufficient gain filtering, while the mode-locking under a strong self-phase modulation and positive group-delay dispersion is the weakest and a certain amount of gain filtering (narrowing) is necessary. A minimum unsaturated absorber loss is required for stable mode-locking in most situations. When the multiple Stark-split sub-transitions are involved in the laser gain, it generally broadens the overall gain linewidth and narrows the free-running spectrum. Those Stark-split sub-transitions located near the gain peak primarily affect the gain curvature and therefore how strong the gain filtering effect is. The free-running bandwidth is primarily determined by those Stark-split sub-transitions located within the inhomogeneous linewidth. In passive mode-locking, a larger GDD region of stable mode-locking exists as a result of the involvement of multiple Stark-split sub-transitions compared to the single-transition gain. When mode-locking strength is strong or GDD is small, the gain including the multiple Stark-split sub-transition can be approximated by a single-transition gain of which the homogeneous linewidth is equal to the effective homogeneous linewidth of the Stark-splitting gain.
机译：本文提出了一种超快双增益介质Nd：玻璃激光器的实验演示。该激光器在单个腔体中同时包含Nd：氟磷酸盐玻璃（Schott玻璃LG-810）和Nd：硅酸盐玻璃（Schott玻璃LG-680）。由于整体增益变宽，双增益介质Nd：玻璃激光器通过Kerr-lens锁模产生了34 fs的记录短脉冲。与单介质Nd：玻璃激光器产生的最短脉冲相比，该脉冲缩短了近2倍。掺钕玻璃的特征在于不均匀加宽和多次Stark分裂子跃迁。本文对非均匀加宽激光器的被动锁模进行了全面的研究。对于宽带非均匀加宽的激光器，当激光光谱超过最大可锁定光谱时，锁模变得不稳定。由于增益滤波不足而导致的这种锁模不稳定性在均匀加宽的激光器中不会出现。通过纯自幅度调制的锁模本质上是一个锁相过程。孤子锁模能够最好地抵抗增益滤波不足的影响，而强自相位调制和正的群时延色散下的锁模最弱，需要一定数量的增益滤波（变窄）。在大多数情况下，需要最小的不饱和吸收体损耗才能实现稳定的锁模。当多个斯达克分裂子跃迁参与激光增益时，通常会加宽总增益线宽并缩小自由运行频谱。位于增益峰值附近的那些斯达克分裂子跃迁主要影响增益曲率，因此影响增益滤波效果的强度。自由运行带宽主要由位于不均匀线宽内的那些Stark拆分子转换确定。在无源锁模中，由于存在多个Stark分裂子转换而不是单转换增益，因此存在较大的GDD稳定锁模区域。当锁模强度强或GDD较小时，包括多个Stark-split子转换的增益可以通过单转换增益来近似，其均匀线宽等于Stark分裂增益的有效均匀线宽。

著录项

  • 作者

    Han, Song.;

  • 作者单位

    University of Maryland, Baltimore County.;

  • 授予单位 University of Maryland, Baltimore County.;
  • 学科 Engineering Electronics and Electrical.Physics Optics.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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