光泵浦半导体微腔激光器的超快场偏振动力学

E. Blansett, D. McAlister, M. Raymer
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引用次数: 0

摘要

只提供摘要形式。垂直腔面发射激光器(VCSEL)的极化特性源于电子总角动量J/sub z/沿垂直轴投影的变化,从导带跃迁到价带。对于量子阱,J/sub z/=/spl plusmn/1/2为导带,J/sub z/=/spl plusmn/3/2为重空穴价带,即非应变量子阱中最高能价带。偶极子允许跃迁在J/sub z/=-1/2和J/sub z/=-3/2之间产生右圆偏振光,在J/sub z/=+1/2和J/sub z/=+3/2之间产生左圆偏振光。在连续波中,电泵浦vcsel,极化状态和波动可以用基于这些跃迁的模型很好地描述(San Miguel et al, 1995)。我们正在研究超短脉冲(<1 ps)光泵浦VCSELs的偏振特性,这使我们能够控制角动量状态的相对数量,并监测偏振模式的强度、噪声和相关性随时间的发展。
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Ultrafast field-polarization dynamics in an optically pumped semiconductor microcavity laser
Summary form only given. The polarization properties of vertical cavity surface emitting lasers (VCSEL) originate in the change of electron total angular momentum J/sub z/ projected along the vertical axis for transitions from the conduction to the valence band. For quantum wells, J/sub z/=/spl plusmn/1/2 for the conduction band, and J/sub z/=/spl plusmn/3/2 for the heavy hole valence band, the highest energy valence band in unstrained quantum wells. The dipole allowed transitions are between J/sub z/=-1/2 and J/sub z/=-3/2 producing right circularly polarized light and between J/sub z/=+1/2 and J/sub z/=+3/2 producing left circularly polarized light. In CW, electrically pumped VCSELs, polarization states and fluctuations are well described by a model based on these transitions (San Miguel et al, 1995). We are investigating the polarization properties of VCSELs optically pumped with ultrashort pulses (<1 ps) which allows us to control the relative population of the angular momentum states and monitor the development of the intensity, noise, and correlations of the polarized-modes as a function of time.
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