| Summary: | 博士 === 國立交通大學 === 光電工程所 === 91 === One issue of this dissertation is to study the influence of pump-to-mode overlap in the slope efficiency and output beam quality in diode end-pumped solid-state lasers. The space-dependent rate equations were employed to analyze the thermal effects in CW and Q-switched end-pumped solid-state lasers. Including the thermal effects into the cavity design, a 30W of TEM00 CW mode output power with good beam quality and near 1 mJ pulse energy in Q switched operation were developed. The other issue of this dissertation is to study the formation of high-order transverse modes in a microchip laser. Experimentally, a technology based on a doughnut pump profile was developed to generate pure Laguerre-Gaussian (LG) TEM*0,l modes. In addition, the dynamics of a solid-state laser sustaining the oscillation of the Laguerre-Gaussian TEM*0,l mode is investigated theoretically and experimentally. On the other hand, a new type of laser transverse modes was demonstrated in an isotropic microchip laser with a doughnut pump profile. The observed transverse modes include elliptic and hyperbolic wave patterns that are analogous to the quantum states of classical trajectories of a 2D harmonic oscillator. Finally, it was found that the transverse pattern of optical vortex lattices could be generated by controlling the transverse mode spacing, the mode size and pump profile.
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