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首页> 外文学位 >Self-heterodyne beating of dual polarization modes in a single-frequency, microchip holmium,thulium:YAG laser and injection -seeding of a Q-switched oscillator.
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Self-heterodyne beating of dual polarization modes in a single-frequency, microchip holmium,thulium:YAG laser and injection -seeding of a Q-switched oscillator.

机译：单频微芯片chip，YAG激光器中双极化模式的自外差拍打和调Q振荡器的注入-播种。

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摘要

This dissertation presents results of a study on the development of an injection-seeded flashlamp-pumped, Q-switched Ho,Tm,Cr:YAG 2.1 ;A flashlamp-pumped Ho,Tm,Cr:YAG laser was developed and modified for Q-switched operation. The maximum output energy for TEM;After a high-resolution spectral study was made, it was determined that the supposedly CW single-frequency microchip Ho:YAG laser did not operate on a single frequency, but actually operated on two, slightly elliptical, dual-polarized orthogonal laser modes, which could not be detected by conventional spectroscopic techniques (i.e. spectrometer, Fabry-Perot). These two orthogonal modes were separated in frequency by approximately 12 MHz, and when photodetected, produced a 12 MHz self-heterodyne beat signal. Our studies indicated, for the first time to our knowledge, that the dual-polarization modes were produced by residual stress in the Ho:YAG laser crystal, which caused the normally isotropic YAG crystal to become slightly birefringent. It was found that one of the dual polarization modes could be eliminated through use of an external polarizer and a quarter-wave plate, but that small changes (;Lastly, the wavelength of the microchip Ho,Tm:YAG laser could be tuned continuously by changing either the crystal temperature or pump laser power. Crystal temperature tuning provided 20 GHz tuning range and pump power tuning provided 4 GHz fine tuning range. In order to study the wavelength tuning of the microchip laser, the laser was used as a tunable optical source to conduct preliminary laboratory absorption measurements of CO
机译：本论文介绍了一种注射注入的闪光灯泵浦，调Q的Ho，Tm，Cr：YAG 2.1的研究成果;开发了一种闪光灯泵浦的Ho，Tm，Cr：YAG激光器并对其进行了改进切换操作。 TEM的最大输出能量;进行了高分辨率光谱研究后，确定了所谓的CW单频微芯片Ho：YAG激光器不是在单个频率上工作，而是实际上在两个稍椭圆的双波长上工作-偏振正交激光模式，这是常规光谱技术（即光谱仪，Fabry-Perot）无法检测到的。这两个正交模式在频率上相隔约12 MHz，并在进行光检测时产生了12 MHz自外差拍频信号。我们的研究首次表明，双极化模式是由Ho：YAG激光晶体中的残余应力产生的，这导致正常的各向同性YAG晶体变得略微双折射。已发现可以通过使用外部偏振器和四分之一波片消除双偏振模式之一，但是微小的变化（最后，可以通过连续调谐微芯片Ho，Tm：YAG激光器的波长改变晶体温度或泵浦激光功率。晶体温度调谐提供20 GHz调谐范围，泵浦功率调谐提供4 GHz精细调谐范围。为了研究微芯片激光器的波长调谐，将该激光器用作可调光源对CO进行初步的实验室吸收测量

著录项

  • 作者

    He, Chuan.;

  • 作者单位

    University of South Florida.;

  • 授予单位 University of South Florida.;
  • 学科 Optics.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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