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Quantum dot diode lasers.

机译：量子点二极管激光器。

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摘要

Quantum dot (QD) diode lasers are electrically pumped semiconductor lasers with quantum dots as the gain medium. Quantum dots (QDs) are nano-sized semiconductor objects embedded in larger band-gap semiconductor materials on a wafer. Because of strong confinement of carriers in the QDs, their energy levels are quantized and discrete. QDs have large differential gain and multiple gain-recovery times. Because of the size variation for different dots, a QD ensemble shows inhomogeneous broadening and has a broad gain bandwidth.;In ultrashort-pulsed diode lasers, the pulse width is limited by both the gain bandwidth and a linewidth-broadening mechanism because of amplitude-phase coupling that occurs when the gain is due to quantum wells or other types of semiconductor material.;Motivated by the unique gain properties of QDs and their broad gain bandwidth and small linewidth-broadening effect, I focused my research on passively mode-locked pulsed diode lasers with two sections. In such lasers, a picosecond bright pulse train can be obtained. Moreover, bistability in the lasing wavelength can be observed in two-section diode lasers.;In this thesis, I reported the demonstration of the first dark pulse train in a passively mode-locked laser. This laser is an external-cavity, passively mode-locked QD diode laser with a saturable Bragg reflector as the absorber. I used the Haus model (a physical model to describe the pulse evolution in a mode-locked laser) and numerical simulation to show that a dark pulse is a stable solution in this laser's dynamics, as long as it includes gain and a saturable absorber. The multiple-gain dynamics of the QDs are the key to stable dark pulses in this laser.;I also studied a nonlinear electrically pumped waveguide array with respect to waveguide coupling through evanescent wave coupling and carrier diffusion. I observed optical power oscillations in this device.
机译：量子点（QD）二极管激光器是以量子点为增益介质的电泵浦半导体激光器。量子点（QD）是嵌入在晶圆上较大带隙半导体材料中的纳米尺寸半导体对象。由于量子点中的载流子很有限，它们的能级被量化和离散。 QD具有较大的差分增益和多个增益恢复时间。由于不同点的尺寸变化，QD整体显示出不均匀的展宽并具有较宽的增益带宽。;在超短脉冲二极管激光器中，由于幅值较大，脉冲宽度受增益带宽和线宽扩展机制的限制-当增益是由于量子阱或其他类型的半导体材料引起时，就会发生相位耦合；由于量子点的独特增益特性及其宽增益带宽和较小的线宽扩展效应，我将研究重点放在了被动锁模脉冲上有两个部分的二极管激光器。在这样的激光器中，可以获得皮秒级的明亮脉冲串。此外，在两段式二极管激光器中可以观察到激光发射波长的双稳态性。在这篇论文中，我报道了在被动锁模激光器中第一个暗脉冲序列的演示。该激光器是一种外腔，被动锁模QD二极管激光器，具有可饱和的布拉格反射器作为吸收器。我使用了Haus模型（一种物理模型来描述锁模激光器中的脉冲演化），并通过数值模拟证明了暗脉冲是该激光器动力学的稳定解决方案，只要它包括增益和可饱和吸收体即可。量子点的多增益动力学是该激光器中稳定暗脉冲的关键。我还研究了通过electrically逝波耦合和载流子扩散的非线性电泵波导阵列与波导耦合的关系。我观察到此设备中的光功率振荡。

著录项

  • 作者

    Feng, Mingming.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 147 p.
  • 总页数 147
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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