Experimental Observation of Stabilization of Vortex Beams in Noninstantaneous Self-focusing Media
Date Issued
2005
Date
2005
Author(s)
Chen, Shiuan-Yeh
DOI
en-US
Abstract
Vortex is an interesting phenomenon which appears in many branches of physics, including optics, fluid dynamics, and BEC. This dissertation is mainly to present the experimental results of stabilization of the optical vortex in noninstantaneous self-focusing media.
The work is focused on the suppression of azimuthal instability (AI) which causes the vortex beam to break into pieces in the nonlinear self-focusing media. From the theoretical analysis of the related phenomenon “modulation instability” (MI), we predict the way to eliminate MI may be applied to annihilate AI. In a series of experiments, the stabilized single charge and double charge vortex beam are observed by increasing the temporal frequency of perturbation and the response time of the nonlinear material. From inspection of interference patterns of these self-trapped stabilized vortex beams, we can confirm their phase information is reserved. That is, these vortex beams are coherent, which are different from earlier observation of the vortex beams stabilized by the partially incoherent light.
Subjects
漩渦光
非即時
自聚焦
光孤子
Vortex
Noninstantaneous
Self-focusing
soliton
Type
thesis
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