[OPTICAL REVIEW Vol. 21, No. 1 (2014) 1-3]
© 2014 The Japan Society of Applied Physics

A Novel Automatic Measurement Method of Laser Beam Divergence Angle Based on Two Linear Array Charge Coupled Devices

Jing XIE1,2, Haiqing CHEN1, Zuojun TAN2*, Dejia HOU2, and Xianfeng WANG2

1Optical and Electronic Information, Huazhong University of Science and Technology, 430070 Wuhan, P. R. China
2College of Sciences, Huazhong Agricultural University, 430070 Wuhan, P. R. China

(Received September 23, 2013; Revised October 19, 2013; Accepted October 23, 2013)

We propose a scanning imaging measurement method using two linear array charge coupled devices (CCD) to evaluate the transmission performance of the linear laser beam of 90° × 2°. The two linear array CCDs are placed at two positions in the far field separated by a definite angle. The beam divergence angles in the view direction are measured by linear fitting because the beam width conforms to the linear relationship in the far field. This method has the ability for real-time testing and is appropriate for the complicated beam shapes with a wide measurement range.

Key words: beam divergence angle, linear array CCD, beam width, light intensity distribution

*E-mail address: tzj@mail.hzau.edu.cn