Measurement of the linewidth enhancement factor of quantum cascade lasers by the self-mixing technique
Measurement of the linewidth enhancement factor of quantum cascade lasers by the self-mixing technique
复制标题
自混合技术测量量子级联激光器线宽增强因子
DOI：
10.1117/12.662986
复制
发表时间：
2006
影响因子：
8.6
通讯作者：
C. Mann
中科院分区：
文献类型：
--
作者：
J. von Staden;T. Gensty;M. Peil;W. Elsässer;G. Giuliani;C. Mann
利用自混合技术测量了分布反馈量子级联激光器（DFB-QCL）的线宽增强因子。通过分析光反馈引起的激光器发射特性的变化，研究了线宽增强因子。我们将证明，我们的自混合设置与QCL在中红外波长区工作良好，并且可以使用所获得的信号来提取线宽增强因子。我们提出了一种装置，记录的自混合信号与电压信号的激光器装置使用的激光器作为检测器本身。在本文中，我们将展示这种测量技术的优点。第一次测量的线宽增强因子产量值从0.24上升到2.6与QCL的注入电流的增加。我们将讨论注入电流对线宽增强因子的影响。
We present measurements of the linewidth enhancement factor of a distributed feedback quantum cascade laser (DFB-QCL) using the so-called self-mixing technique. The linewidth enhancement factor is investigated by analyzing optical feedback induced changes of the emission properties of the laser. We will demonstrate that our self-mixing setup works well with QCLs in the mid infrared wavelength regime, and that it is possible to use the obtained signal to extract the linewidth enhancement factor. We present a setup that records the self-mixing signal with the voltage signal across the laser device using the laser as a detector itself. In this contribution we will show the advantages of this measurement technique. First measurements of the linewidth enhancement factor yield values that rise from 0.24 to 2.6 with an increase of the injection current of the QCL. We will discuss the influence of the injection current on the linewidth enhancement factor.