Determination method of average radius of ripple serrated aperture for realizing Gaussian beam shaping

Abstract

The invention discloses a determination method for an average radius of a ripple serrated aperture for realizing Gaussian beam shaping, and belongs to the field of laser. The method comprises the following steps of: determining aperture radius r, namely r is equal to a*(1+a1*sin (5 theta) sin (50 theta)), wherein a is the average radius which is 0.001-0.003 m, and a1 is modulation width which is 0.05; then manufacturing apertures r of different radiuses to perform experiments and calculating characteristic parameters: filling factor, modulation intensity and light intensity contrast; and finally determining the optimal range of the average radius a to be between 60 percent and 65 percent of beam width of an emitted Gaussian beam from the characteristic parameters. By using the method, a part of energy of the Gaussian beam is intercepted to improve the filling ratio through the aperture; the modulation strength is reduced through irregularity of the edge of the aperture; the optimal ratio of the average radius of the serrated aperture to the Gaussian beam width is determined through calculation of the characteristic parameters; and thus, an output beam with better light intensity distribution is obtained. The method can be widely used in a high-power solid laser for shaping and homogenizing the Gaussian beam, and is easy to operate and easy for engineering application.

Description

technical field [0001] The invention relates to an amplitude-modulated corrugated sawtooth diaphragm whose average radius is proportional to the beam width of the incident Gaussian beam to realize beam shaping and homogenization, combined with a spatial filter, to obtain high filling rate, modulation intensity and light intensity contrast Smaller, nearly flat-topped beams belong to the field of high-efficiency laser manufacturing. Background technique [0002] In the beam intensity distribution of practically applied lasers, it is Gaussian or near-Gaussian in many cases, and there are few ideal plane waves. However, the light intensity of the Gaussian distribution will gradually weaken with the increase of the radius, and the energy less than a certain value cannot be effectively amplified in the subsequent amplification, that is, the filling factor is reduced, and the energy storage of the subsequent amplification working material cannot be fully utilized. Generally, an ap...

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Problems solved by technology

Therefore, the design of high-power lasers involves such a basic problem: under the premise of suppressing the beam Fresnel diffraction modulation and the resulting small-scale self-focusing, how to ensure the full use of the energy storage of the gain medium, that is, h

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