• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >An optical reference and frequency comb for improved spectroscopy of helium.
【24h】

An optical reference and frequency comb for improved spectroscopy of helium.

机译：用于改善氦光谱的光学参考和频率梳。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An optical frequency comb was used to transfer the high stability and narrow linewidth of an iodine optical frequency reference to a diode laser at 1083 nm. This new optical source was developed as an important step toward an improved measurement of the helium 23S - 23PJ optical transition frequencies and fine structure intervals, as needed to determine the fine structure constant alpha and test QED. The 1083 nm diode laser was used to perform saturated absorption spectroscopy on helium atoms in a variable-pressure discharge cell. Using the new source, what had been the largest source of drift was removed and an improved resolution of 100 Hz was achieved. This improved resolution was used to search for systematics that would affect helium spectroscopy at a higher level of precision. Although several improved studies of already-known systematics are presented, three new sources of systematic frequency shifts were discovered: laser beam misalignment, a residual linescan asymmetry, and an imbalance in signal sizes for transitions between resolved magnetic sublevels. As a contribution to future measurements at a higher accuracy, we measure and model these three dominant error sources, and explore their underlying physical mechanisms.
机译：使用光学频率梳将碘光学频率参考的高稳定性和窄线宽传递给1083 nm的二极管激光器。开发这种新光源是迈向改进氦23S-23PJ光学跃迁频率和精细结构间隔测量的重要一步，可根据需要确定精细结构常数α并测试QED。 1083 nm二极管激光器用于对可变压力放电室中的氦原子进行饱和吸收光谱分析。使用新的源，原来是最大的漂移源被去除了，并且分辨率提高了100 Hz。改进后的分辨率用于搜索会以更高的精度影响氦光谱的系统分析仪。尽管介绍了对已知系统的一些改进研究，但发现了系统频移的三个新来源：激光束未对准，残留线扫描不对称以及已解析磁子级之间转换的信号大小不平衡。为了以更高的精度为将来的测量做出贡献，我们对这三个主要误差源进行了测量和建模，并探讨了它们的潜在物理机制。

著录项

  • 作者

    Farkas, Daniel.;

  • 作者单位

    Harvard University.;

  • 授予单位 Harvard University.;
  • 学科 Physics Atomic.; Physics Optics.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 293 p.
  • 总页数 293
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分子物理学、原子物理学;光学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号