Laser beam homogenizing device and method

Abstract

The invention provides a laser beam homogenizing device and method, and is used for homogenizing laser of which power distribution is Gaussian distribution. The laser beam homogenizing device comprises a divergent optical element group which is used for converting incident laser into divergent light; and a beam splitting optical element group which is used for performing beam splitting on the divergent light and superposing the laser after beam splitting to form flat-topped beams. With application of the laser beam homogenizing device and method, the laser of which power distribution is Gaussian distribution is shaped into the flat-topped light so that the cost is low without selectivity for the wavelength and the rectangular spot size is flexible and adjustable, and the homogenizing effect is great within a large scope of the depth of field.

Description

technical field [0001] The invention relates to the field of laser shaping, in particular to a laser homogenization device and method, which converts the Gaussian distribution of laser energy distribution into a flat-top uniform distribution. Background technique [0002] The optical power distribution of the laser cross-section is generally a Gaussian distribution, that is, the center power is high, and the power becomes smaller as it goes to the edge. However, in some application fields such as laser welding, laser surface treatment and laser medicine, the power distribution of the laser is required to be a flat-top uniform distribution, so some optical shaping methods must be used to achieve this purpose. At present, the main flat-hat light shaping schemes include: aperture diaphragm interception method, diffractive optical element method, microlens array shaping method, aspheric lens method, etc. There are obvious shortcomings in the implementation of the above shaping ...

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Problems solved by technology

However, the homogenization effect obtained by this method is not good, and the light energy loss is serious; the diffractive optical element method can only be designed according to the demand, once the parameters such as the laser wavelength are changed, it must be redesigned, and the laser damage threshold of this scheme is relatively low. Low power, can only be applied to low-power lasers, and the design and manufacturing costs of diffractive optical elements are high, and the assembly accuracy requirements are relatively strict; the cost of micro-lens array shaping is high, the realized area is too small, and it is easy to produce interference fringes Disadvantages: The production cost of aspheric mirrors in the aspheric lens method is also high

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