Design and fabrication of an elliptical micro-lens array with grating for laser safety

L. H. Li, B. Q. Wu, C. Y. Chan, Wing Bun Lee, L. H. Dong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


With the enormous expansion of laser usage in medicine, industry and research, all facilities must formulate and adhere to specific safety methods that appropriately address user protection. The protective ellipticalal microstructure with grating is a novel technology which can provide the principal means of ensuring against ocular injury, and must be worn at all times during laser operation. On the basis of Fresnel's law and the diffractive law, Solidworks and Lighttools software are applied to design the elliptical micro-lens array and correspondent grating. The height of the microstructure is 100um and its period is 3mm. The period of grating is 5um. It is shown that the amount of emergent light of a specific wavelength (1064nm) can reflect more than 40° from the incident light through simulation, while the incident light is perpendicular to the microstructure. The fabrication adopts the ultra-precision single point diamond method and injection molding method. However, it is found in the test that the surface roughness has a serious effect on the angle between the emergent and incident light. As a result, the element can reflect the vertical incidence beam into a tilted emergent beam with a certain angular degree, as well as protecting users from laser damage injures.
Original languageEnglish
Title of host publicationAOPC 2015
Subtitle of host publicationOptical Design and Manufacturing Technologies
ISBN (Electronic)9781628419016
Publication statusPublished - 1 Jan 2015
EventApplied Optics and Photonics, China: Optical Design and Manufacturing Technologies, AOPC 2015 - Beijing, China
Duration: 5 May 20157 May 2015


ConferenceApplied Optics and Photonics, China: Optical Design and Manufacturing Technologies, AOPC 2015


  • elliptical micro-lens array
  • Injection molding method
  • Laser safety
  • ultra-precision single point diamond method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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