A system and method for reducing the effects of unwanted orders of optical diffraction devices
A technology of diffractive devices and optical devices, which is applied in the field of optics, can solve problems such as the inability to effectively reduce the impact of unwanted orders, and achieve the effects of reducing adverse effects, increasing the number of beam splits, and the number of multi-beam splits
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Embodiment 1
[0037] A system for subtracting the effects of unwanted orders in optical diffractive devices, such as figure 1 As shown, it includes: a light generator 1, an optical diffraction device 2 and a beam focusing device 4 placed in sequence along the direction of the light path, and an aberration optics placed between the image square focal plane of the light generator 1 and the beam focusing device 4 Device 3; Specifically, in this embodiment, the aberration optical device 3 is placed between the optical diffraction device 2 and the beam focusing device 4;
[0038] Wherein, the light generator 1 is used to provide a light source; the light generator 1 can be a laser, a light emitting diode, a mercury lamp, a halogen lamp, etc.;
[0039] The aberration optical device 3 is used to increase the first optical aberration in the optical path to degrade the beam quality in the optical path; specifically, the aberration optical device 3 can be any optical device that can increase the aber...
Embodiment 2
[0057] A method for reducing the influence of unwanted orders of an optical diffraction device, comprising the following steps:
[0058] S1. Add the first optical aberration in the optical path where the optical diffraction device is located to degrade the beam quality; specifically, the method of increasing the first optical aberration in the optical path includes: using a cylindrical lens to generate astigmatism; or, based on a deformable The irregular reflective surface of the mirror introduces aberrations; or, making the beam incident on the edge of the lens, introduces astigmatism and coma. It should be noted that the first optical aberration is different from the aberration generated by optical devices and optical elements during normal use, and is the aberration added to the optical path by intentionally placing an aberration optical device in the optical path.
[0059] S2. Based on the optical diffraction device, the beam is wavefront modulated to obtain the outgoing l...
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