AI Article Synopsis

  • A novel technique enhances the focus depth of a Gaussian beam through a two-step process using binary phase diffractive optical elements (BPDOEs).
  • The first BPDOE converts the Gaussian beam into a high-order radial Laguerre-Gaussian beam, while the second BPDOE modifies this beam into a quasi-Gaussian beam at the focal point of a lens.
  • This quasi-Gaussian beam shows reduced divergence and greater focus depth than a standard Gaussian beam, presenting new applications for laser manufacturing and micromachining with extended focus depth.

Article Abstract

A novel technique to improve the focus depth of a Gaussian beam is presented in this paper. The improvement is based on two-step beam shaping using a cascade of binary phase diffractive optical elements (BPDOEs). The first BPDOE transforms the incident Gaussian beam into a high-order radial Laguerre-Gaussian beam (LG). Then the second BPDOE rectifies the obtained LG beam and gives rise to a quasi-Gaussian one in the focal plane of a converging lens. This resulting quasi-Gaussian beam exhibits a lower divergence and larger focus depth compared to the pure Gaussian beam having the same beam waist. These results open new possibilities in laser beam manufacturing and micromachining, and in applications that need an extended focus depth.

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Source
http://dx.doi.org/10.1364/AO.57.001899DOI Listing

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