科研之友
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摘要
An iterative method based on the Huygnes-Fresnel principle was used to retrieve the Kerr-effect-aberrated phase profile from the measured beam intensity distributions in two longitudinally separated cross sections. The time of iteration was found to depend on the sampling cross sections of the light beam. We first analyzed the unaberrated TEM(00) Gaussian beam with a parabolic phase profile by the q-parameter transformation and found that the convergence will be accelerated if two cross sections are located in regions with small radii of curvature in the wavefront. We also show that the fast convergent conditions are applicable to retrieving the Kerr-effect-aberrated phase profile of a laser beam. If the non-linear medium is placed at the waist's position (z = 0), the choice with one cross section located at z = (1)/(2) z(0) and the other at z = (3)/(2) z(0), leading to fast convergence, is recommended for retrieving the Kerr-effect-aberrated phase profile which can be used to give information on the optical nonlinearities of materials. Using the suggested cross sections can greatly save time in the iterative calculation.
- 出版日期2010-6
