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Quantum coherence and interference effects in doped crystals and semiconductor quantum wells for reduced absorption and lasing without population inversion.

机译：掺杂晶体和半导体量子阱中的量子相干和干涉效应可减少吸收和激光发射，而不会发生种群反转。

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摘要

This dissertation explores the effects of using one laser field to create quantum coherence and interference in doped crystals and semiconductor quantum wells. In doped crystals, lasing withput population inversion (LWI) is numerically studied both in steady state and in the transient regime to help understand the dynamical behavior of the LWI process by solving the complex coupled density matrix equations. The effects of the large transition linewidths resulting from inhomogeneous broadening in doped crystals are shown to reduce the overall gain. Zeeman-split ground state energy levels coupled by a microwave field in Ruby are shown to exhibit reduced absorption with the microwave on where the effect of the probe laser linewidth is included by taking the convolution of the resulting response with the probe laser lineshape function. The results do agree with experiments.; In double quantum wells, a three subband model in which two tunneling-split subbands are coupled by a dc-field is studied. The importance of the dc-field in establishing the quantum coherence and interference is shown. The coulomb renormalization of electron kinetic energy is included through the Hartree-Fock approximation and the effects of excitonic renormalization are included by using the Ladder and Phase approximations.
机译：本文探讨了使用一个激光场在掺杂晶体和半导体量子阱中产生量子相干和干涉的影响。在掺杂晶体中，无论是在稳态还是在瞬态状态下，都对激光发射人口反演（LWI）进行了数值研究，以通过求解复杂的耦合密度矩阵方程来帮助了解LWI过程的动力学行为。结果表明，由于掺杂晶体的不均匀展宽而导致的大过渡线宽的影响降低了总增益。通过将结果响应与探头激光线形函数进行卷积，显示出在Ruby中由塞曼分裂基态能级与Ruby中的微波场耦合显示出对微波的吸收降低，在微波中，包括探头激光线宽的影响。结果与实验一致。在双量子阱中，研究了三个子带模型，其中两个隧穿-分裂子带通过直流场耦合。显示了直流场在建立量子相干和干涉中的重要性。电子动能的库仑重整化通过Hartree-Fock近似进行，激子重整化的影响通过使用Ladder和Phase近似进行计算。

著录项

  • 作者

    Awad, Iyad (Eddie) G.;

  • 作者单位

    Wayne State University.;

  • 授予单位 Wayne State University.;
  • 学科 Engineering Electronics and Electrical.; Physics Optics.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 104 p.
  • 总页数 104
  • 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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