Design and fabrication of computer-generated holograms for testing optical freeform surfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hua Shen
  • Rihong Zhu
  • Zhishan Gao
  • W. H. Wong
  • Xiaoli Zhu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number32201
Journal / PublicationChinese Optics Letters
Volume11
Issue number3
Publication statusPublished - Mar 2013

Abstract

Freeform optical surfaces (FOSs) will be the best elements in the design of compact optical systems in the future. However, it is extremely difficult to measure freeform surface with sufficient accuracy, which impedes the development of the freeform surface. The design and fabrication of computer-generated hologram (CGH), which has been successfully applied to the tests for aspheric surfaces, cannot be directly adopted to test FOSs due to their non-rotational asymmetry. A novel ray tracing planning method combined with successively optimizing even and odd power coefficients of phase polynomials in turn is proposed, which can successfully design a non-rotational asymmetry CGH for the tests of FOSs with an F-θ lens. A new eight-step fabrication process is also presented aiming to solve the problem that the linewidth on the same circle of the CGH for testing freeform surface is not uniform. This problem cannot be solved in the original procedure of CGH fabrication. The test results of the step profiler show that the CGH fabricated in the new procedure meets the requirements. © 2013 Chinese Optics Letters.

Research Area(s)

Citation Format(s)

Design and fabrication of computer-generated holograms for testing optical freeform surfaces. / Shen, Hua; Zhu, Rihong; Gao, Zhishan; Pun, E. Y B; Wong, W. H.; Zhu, Xiaoli.

In: Chinese Optics Letters, Vol. 11, No. 3, 32201, 03.2013.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review