School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
Sensors (Basel). 2018 Nov 16;18(11):4004. doi: 10.3390/s18114004.
This paper presents a new method for measuring the linewidth enhancement factor (alpha factor) by the relaxation oscillation (RO) frequency of a laser with external optical feedback (EOF). A measurement formula for alpha is derived which shows the alpha can be determined by only using the RO frequencies and no need to know any other parameters related to the internal or external parameters associated to the laser. Unlike the existing EOF based alpha measurement methods which require an external target has a symmetric reciprocate movement. The proposed method only needs to move the target to be in a few different positions along the light beam. Furthermore, this method also suits for the case with alpha less than 1. Both simulation and experiment are performed to verify the proposed method.
本文提出了一种新的方法，通过外部光反馈（EOF）激光的弛豫振荡（RO）频率来测量线宽增强因子（α因子）。推导出了α的测量公式，该公式表明，仅使用 RO 频率即可确定α，而无需了解与激光内部或外部参数相关的任何其他参数。与现有的基于 EOF 的α测量方法不同，这些方法需要外部目标具有对称的往复运动。所提出的方法只需要将目标移动到光束的几个不同位置即可。此外，该方法也适用于α小于 1 的情况。进行了模拟和实验以验证所提出的方法。
