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Excess quantum linewidth in laser oscillators with nonorthogonal eigenmodes

机译：非正交本征模激光振荡器中的量子线宽过大

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摘要

A recent reformulation of the laser field equations using the true modes of the laser cavity and including a noise polarization term to account for spontaneous emission shows that the conventional description of quantum spontaneous emission or quantum noise needs to be modified for laser amplifiers or oscillators with nonorthogonal transverse eigenmodes. Gain-guided lasers and unstable-resonator lasers in particular have nonorthogonal transverse modes, and hence are predicted to exhibit excess quantum noise. One important consequence of this theory is the appearance of an excess noise factor which multiplies the well-known Schawlow-Townes formula for the laser quantum linewidth. Analytic and numerical computations have predicted that this excess noise factor can be substantially greater than unity. Experimental confirmations of this effect have, however, been limited to date.;The main purpose of this thesis is to report on the use of the so-called Pound-Drever locking scheme for the measurement of laser frequency noise, and in particular the observation of excess quantum noise in an unstable-resonator laser. The Pound-Drever locking scheme provides a highly sensitive frequency discriminator which is immune (to first-order) to intensity fluctuations and has a large bandwidth for frequency noise measurement. In our experiment a Pound-Drever measurement tracks the slow drifts of our laser, while the discriminator signal gives a sensitive measure of the level of quantum noise in the laser oscillator. We will describe the application of this measurement technique to the experimental investigation of excess quantum noise in an unstable-resonator diode-pumped solid-state laser. We have measured the quantum noise contribution to the frequency spectra of both a stable-resonator and an unstable-resonator diode-pumped Nd:YAG laser. The stable-resonator laser shows no excess noise, as expected. The unstable-resonator laser, however, exhibits a large excess quantum noise, in reasonable agreement with theoretical predictions.
机译：最近使用激光腔的真实模式对激光场方程进行的重新表述，并包括噪声极化项以说明自发辐射，这表明，对于非正交的激光放大器或振荡器，需要对量子自发辐射或量子噪声的常规描述进行修改横向本征模。增益引导激光器和不稳定谐振器激光器特别是具有非正交的横向模，因此被预测会表现出过量的量子噪声。该理论的一个重要结果是出现了多余的噪声因子，该噪声因子乘以众所周知的针对激光量子线宽的Schawlow-Townes公式。分析和数值计算已经预测，这种多余的噪声因子可能会大大大于1。然而，迄今为止，对这种效应的实验证实还仅限于此。本论文的主要目的是报告使用所谓的Pound-Drever锁定方案来测量激光频率噪声，尤其是观察到的噪声的方法。不稳定谐振激光器中多余的量子噪声。 Pound-Drever锁定方案提供了一种高灵敏度的鉴频器，该鉴频器不受强度波动的影响（一阶），并且具有用于测量频率噪声的大带宽。在我们的实验中，Pound-Drever测量跟踪了我们激光器的缓慢漂移，而鉴频信号则给出了激光振荡器中量子噪声电平的灵敏测量。我们将描述这种测量技术在不稳定谐振二极管泵浦固态激光器中过量量子噪声的实验研究中的应用。我们已经测量了量子噪声对稳定谐振器和不稳定谐振器二极管泵浦Nd：YAG激光器的频谱的影响。如预期的那样，稳定谐振激光器没有显示出过多的噪声。然而，不稳定谐振激光器显示出大量的过量量子噪声，与理论预测合理地吻合。

著录项

  • 作者

    Mussche, Paul L.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Optics.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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