Measurement of Gaussian Beam Radius by Using a Threaded Rod Scanning Method

Abstract

We proposed threaded rod scanning for determining a Gaussian beam radius by using opaque optical fiber, instead of conventional knife-edge scanning, and derived an analytic expression for transmitted beam power. In addition, we compared the experimental results from threaded rod scanning with those of data by using conventional beam profile measurement techniques such as knife-edge scanning and image sensor acquisition to validate the proposed method. Consequently, the estimated results obtained by three independent methods were consistent with a little micrometer precision.