| Summary: | 碩士 === 高雄師範大學 === 物理學系 === 98 === We observed the nonlinear dynamics of optical feedback by polarized pumping michrochip Nd:YVO4 solid state laser. Herein, we select linearly, circularly and elliptically polarized beam to pump the a-cut Nd:YVO4 crystal. When the crystal is pumped by linearly polarized light, we can get low threshold pumping power and high output conversion efficiency. Corresponding to the circularly and elliptically polarized light, the oscillation amplitude and its corresponding frequency of the solid state laser output pumped by linearly polarized light are the highest.
In this laser system, the phenomenon of random chaotic burst (RCB) due to optical feedback was observed. In this study, we use three methods, the power spectrum analysis, relative intensity noise (RIN) and the return map, to analyze the nonlinear dynamics of the feedback system. From the experimental results, the phenomenon of random chaotic burst (RCB) has no relationship with polarization of pump beam. But the phenomenon can be suppressed by incoherent optical feedback.
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