基于偏光干涉的激光波长测量方法设计与实验

Design and Experimental Research on Laser Wavelength Measuring Method Based on Polarization Interference

摘要:

提出了一种基于双偏光干涉滤波器的激光波长测量方法，该方法克服了传统偏光干涉装置测量波长时分辨率存在盲区的缺点，通过把粗测和精测两个子系统结合可解决测量的周期性问题。实验结果表明，采用长度为1cm的YVO₄晶体作为滤波器，可实现误差小于0.01nm的测量。与基于迈克尔逊干涉仪的波长测量方法相比，所提出的方法无需机械运动部件和参考光源，测量精度满足DWDM光纤通信系统测试的要求。

Abstract:

Based on the principle of polarization interference, a novel laser wavelength measuring method is proposed with dual polarization interference filters, in which the uniformity of wavelength resolution is realized. Combining two subsystems as proposed with different measuring ranges, the wavelength ambiguity due to the periodical response of polarization interference filter is resolved. Experimental results show that the measurement precision of 0.01nm can be obtained when YVO4 crystal with the length of 1cm is used as the filter. Compared with the current methods such as ones based on Michelson interferometer, No mechanical components and reference light source is required for the proposed method, and the measurement precision is satisfied for the requirement in the fields of optical fiber communications.