...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optical engineering >Pseudorandom dynamics of frequency combs in free-running quantum cascade lasers
【24h】

Pseudorandom dynamics of frequency combs in free-running quantum cascade lasers

机译：自由运行量子级联激光器中频率梳的伪随机动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Recent research has shown that free-running quantum cascade lasers are capable of producing frequency combs in midinfrared and THz regions of the spectrum. Unlike familiar frequency combs originating from mode-locked lasers, these do not require any additional optical elements inside the cavity and have temporal characteristics that are dramatically different from the periodic pulse train of conventional combs. Frequency combs from quantum cascade lasers are characterized by the absence of sharp pulses and strong frequency modulation, periodic with the cavity round trip time but lacking any periodicity within that period. To explicate for this seemingly perplexing behavior, we develop a model of the gain medium using optical Bloch equations that account for hole burning in spectral, spatial, and temporal domains. With this model, we confirm that the most efficient mode of operation of a free-running quantum cascade laser is indeed a pseudorandom frequency-modulated field with nearly constant intensity. We show that the optimum modulation period is commensurate with the gain recovery time of the laser medium and the optimum modulation amplitude is comparable to the gain bandwidth, behavior that has been observed in the experiments.
机译：最近的研究表明，自由运行的量子级联激光器能够在光谱的中红外和太赫兹区域产生频率梳。与源自锁模激光器的熟悉的频率梳不同，它们不需要在腔体内放置任何其他光学元件，并且具有与常规梳形的周期性脉冲序列明显不同的时间特性。量子级联激光器的频率梳的特点是没有尖锐的脉冲和强大的频率调制，与腔往返时间成周期性，但在该周期内没有任何周期性。为了说明这种看似令人困惑的行为，我们使用光学Bloch方程开发了一个增益介质模型，该方程考虑了光谱，空间和时间域中的空穴燃烧。使用此模型，我们可以确认，自由运行的量子级联激光器的最有效工作模式确实是强度几乎恒定的伪随机调频场。我们表明，最佳调制周期与激光介质的增益恢复时间相称，并且最佳调制幅度与增益带宽相当，在实验中已观察到这种行为。

著录项

  • 来源
    《Optical engineering》 |2018年第1期|011009.1-011009.12|共12页
  • 作者

    Nathan Henry; David Burghoff; Yang Yang; Qing Hu; Jacob B. Khurgin;

  • 作者单位

    Johns Hopkins University, Whiting School of Engineering, Baltimore, Maryland, United States;

    Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Cambridge, Massachusetts, United States;

    Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Cambridge, Massachusetts, United States;

    Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Cambridge, Massachusetts, United States;

    Johns Hopkins University, Whiting School of Engineering, Baltimore, Maryland, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum cascade laser; frequency combs; frequency modulation;

    机译：量子级联激光器频率梳调频;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号