A new synthesis method for synthesizing on-axis flat-topped beams by using a defocusing telescope system

作者：Zhao Bao Yin^*; Lue Bai Da

来源：Acta Physica Sinica, 2008, 57(5): 2919-2924.

• on-axis flat-topped beam
• flat-topped multi-Gaussian beam
• defocusing telescope system
• Fourier transform

A new method for synthesizing on-axis flat-topped beams by using a defocusing telescope system is proposed, where the flat-topped multi-Gaussian beam is chosen as the ideal beam. Within the framework of the paraxial approximation and based on the Collins diffraction integral formula, the analytical expressions for the on-axis field and incident field are derived and analyzed physically. The effect of beam order N, flat-top length parameter L, position of the flat-top centre z(c) and central longitudinal spatial frequency S-c on the on-axis intensity distribution is illustrated by numerical examples. A comparison of our results with the method for simulating the ideal beam by use of the rectangular function shows the advantages of our method.

• 出版日期2008-5
• 单位四川大学