一种基于光拍频的连续激光调制光谱测量方法

针对F-P干涉仪分析连续激光调制光谱的局限性,本文提出了一种基于光拍频的连续激光调制光谱的测量方法,该方法可实现调制频率低达千赫兹的连续激光调制光谱的测量.本方法以光电转换理论为基础,利用频谱分析仪测得参考光与连续调制光谱的拍频信号,然后通过相应的数学计算得到连续调制光谱的各个光频的相对电场强度,从而实现连续调制光谱的分析.本文在理论建模与分析的基础上,利用该方法对半导体激光器出射激光经电光调制器调制产生的调制光谱进行了测量,测量结果与F-P干涉仪测量结果一致,验证了该方法的可行性.

A Measurement Method for a CW Laser Modulation Spectrum Based on Optical Beat Frequency

Because of the limitation of the F-P interferometer for the analysis of a CW laser modulation spectrum,an optical beat frequency method is proposed,which can be used to measure the spectrum with a modulation frequency ～kHz.This method is based on the photoelectric conversion technique.We can get the beat frequency signal of the reference laser and a CW modulation spectrum with the spectrum analyzer,and then have the relative electric field strength of the various optical frequency of a CW laser modulation spectntm through the corresponding mathematical calculation so as to realize the CW modulation spectrum analysis.After theoretically modeling,experiments were carried out to measure a CW laser modulation spectrum generated by a diode laser and an EOM device with the proposed method.Compared with the measuring results with F-P interferometer,experimental results show the feasibility of an optical beat frequency method.