Generations and nonlinear dynamic behaviors of off-axis modes in Nd-doped laser systems

Abstract

In this dissertation we generate two kinds of laser the geometric ring mode and the cylindrical vector beam and investigate the behavior of nonlinear dynamics Using different lengths of Nd-doped laser crystals with different cavity configurations to generate the geometric ring mode Based on the trigonometrical ray tracing the intracavity trace of cavity mode was analyzed and the numerical simulations were supported the experiment results We used three-mirror cavity configuration to generate the azimuthally polarized laser which is a kind of cylindrical vector beam Through the birefringence of laser crystal the o-ray-preferred region was generated at the edge of the stable region Further combining the modulation system; the period-doubling route to chaos were determined At a period of two the two spots of geometric ring mode had inverse period two evolutions When modulation depth increased extreme event was observed The cylindrical vector beam has similar nonlinear dynamics behaviors to the geometric ring mode Compared with the geometric ring mode the nonlinear dynamics behaviors in the cylindrical vector beam is spatially dependent At a period of two the intensity evolution gradually varied with the azimuthal angle When the modulation depth increased the spatiotemporal extreme events occurred with the generation of the chaos At similar cavity configuration which is used in the previous experiment for cylindrical vector beam we change the laser crystal to the diffusion-bonded Nd:YVO4/Nd:GdVO4 to generate an azimuthally polarized laser with dual-wavelength

Date of Award	2018 Aug 6
Original language	English
Supervisor	Ming-Dar Wei (Supervisor)