| Summary: | 碩士 === 國立交通大學 === 光電工程系所 === 92 === The behavior of the axially pumped Nd:YVO4 laser with large pumping spot size is experimently and numerically studied. We show that the instability of this laser system is due to transverse mode beating. We found that there is a V-shaped second threshold of quasi-periodic which agrees with our simulation result. The character of the V-shaped depends on both the pumping power and pumping spot size. In addition, we also observed several kinds of laser dynamics and the instability regions they exit, such as chaos, modulated pulsation, and quasi-period.
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