Far-field Focus Facula Measurement Method Concerning Small-angle of Laser Divergence in Optical Communication

The key technique in optical communications is the narrow beam orientation. According to the small-angle measurement theory of laser alignment system divergence, an accuracy and high-speed measuring method using Charged Couple Device (CCD) is proposed to measure far-filed focus facula. The far-field divergence of laser alignment systems is measured experimentally. The results demonstrate that the error produced by this method is less than the maximum of International Standardization Organization.