Study of Herriott-type modes in degenerate laser cavities

• Main Author: 潘建豪
• Other Authors: 陸亭樺
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/47884860929330765042

碩士 === 國立臺灣師範大學 === 物理學系 === 102 === A laser cavity system is very different from a traditional solid-state laser. By changing the optical components and optical coatings on the laser cavity, various laser patterns can be generated. In this thesis, an experiment on laser cavity and a theoretical explanation are presented. In this experiment, we use a spherical laser cavity and an a-cut Nd:YVO 4 laser gain medium with off-axis pump to generate Herriott-type modes by laser diode in degenerate cavities. The optical geometry, near-far field, equivalent length in cavities and characteristics of different order of this system are studied. As for the theoretical part, a set of Generalized Coherent States (GCS) was first constructed with Hermite-Gaussian function as the basic functions. Then the experimental patterns were reconstructed successfully with the GCS. In conclusion, we demonstrate that Herriot-type modes can be generated with off-axis pump, spherical laser cavity and an a-cut Nd:YVO4 gain medium within degenerated cavities. On the other hand, the Herriot type modes can be successfully reconstructed with GCS.