Exploring vortex beams generated from selectively pumped Nd:YVO4 laser with external astigmatic mode converter

• Main Authors: Tu, Chin-Wei, 涂晉維
• Other Authors: Chen, Yung-Fu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/d2dv3b

碩士 === 國立交通大學 === 電子物理系所 === 107 === The purpose of this thesis is to investigate the theoretical model and experimental results of optical vortex by Nd:YVO4 crystal laser. For this purpose, we study the single-ring architecture and multi-ring architecture generated by external astigmatic mode converter.First,we will introduce the theory of cylindrical lens conversion theory and experiment.To explore the vortex structures of the generated geometric modes, the interference patterns are performed by an experimental apparatus consisting of a Mach-Zehnder interferometer. We exploited the Mach-Zehnder interferometer to display the interference pattern between the plane wave and the circularly geometric mode to investigate its vortex structures. It was clearly found that the numerical calculations agree very well with the experimental observations.