Session 8

[OPTM8-02] Study on laser spot size measurement by scanning-slit method based on back-injection interferometry

*Yuanfu Tan¹ (1. The Chinese University of Hong Kong)

In this study, a new spot size measurement device based on laser back-injection interferometry was presented. The photodiode integrated with the laser diode was used to collect the feedback laser, then the laser spot size was calculated by the feedback current. Results show that our spot size measurement device could measure the spot size of 5 laser diode modules both in the x and y direction , which is cost-effective, easy to operate, and accurate.