| Summary: | 碩士 === 國立嘉義大學 === 光電暨固態電子研究所 === 95 === We study the geometric modes in an end pump Nd:YVO4 laser near the degenerate cavity configurations. By using a single off-axial pump beam with g1g2 =1/2, we obtain the W mode and M modes, which are the same as the previous reserch. When the cavity configuration is at g1g2 =1/4 with single off-axial pump beam, the N modes are observed. In particular, using three pump beam with g1g2 =1/4 we obtain the so called G modes that have never been observed. We investigate the dependence of the geometric modes on pump size, pump position and the pump power ratio. By comparing with the superposition of the high-order Hermite-Gaussian modes of the SU(2) representation, we find some differences between the experiments and the simulation.
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