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AssigneeZhejiang University
InventorsLigang WANG, Lai CHEN
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The present application discloses a method and device for generating an Airy light needle with a long depth of focus and high aspect ratio. A linearly polarized light emitted from the laser passes through the collimated beam expanding system, and then is incident to the spatial light modulator loaded with a specific phase distribution for complex amplitude modulation. The first-order diffraction light passes through the iris and generates the modulated circular Airy beam at the back focal plane of the first 2-f lens system. The modulated circular Airy beam is focused to generate the Airy light needle with long depth of focus and high aspect ratio, which can be accurately controlled by controlling the parameters of the modulated circular Airy beams. The Airy light needle with adjustable depth of focus and aspect ratio can be applied to optical manipulation and optical imaging.
A method for generating an Airy light needle with a long depth of focus and a high aspect ratio, wherein a desired phase distribution for generating a modulated circular Airy beam is loaded on a spatial light modulator, and an initial light field distribution of the loaded modulated circular Airy light is expressed as:
A device for generating an Airy light needle with a long depth of focus and a high aspect ratio, comprising a laser, a collimated beam expanding system, a spatial light modulator, a 2-f lens system, and a light intensity distribution detector set up according to a scheme;
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