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Proceedings Paper

Continuous-phase diffractive optical element for uniform focal spot
Author(s): Qiaofeng Tan; Yingbai Yan; Guofan Jin; Minxian Wu
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Paper Abstract

In high power laser system, such as inertial confinement fusion and laser forming, a uniform focal spot is required with top head, steep edge, low side lobe and concentrated high power performance in the main lobe. Diffractive Optical Element (DOE) is a promising technique to obtain such uniform focal spot. It has the features of high diffraction efficiency, steep edge, small side lobes and high flexibility. On the basis of the analysis of the existed optimization algorithms, three kinds of hybrid algorithms are developed for phase design of the DOE to realize uniform focal spot, including global/local united searching algorithm (GLUSA), the modified GLUSA, and the modified GLUSA with multi-resolution. Continuous phase should be adopted to increase the light efficiency and decrease wide- angle scattering. The continuous phase DOE with diameter 100 mm with more than 95% light efficiency and less than 5% top non-uniformity is designed.

Paper Details

Date Published: 31 August 1999
PDF: 4 pages
Proc. SPIE 3879, Micromachine Technology for Diffractive and Holographic Optics, (31 August 1999); doi: 10.1117/12.360526
Show Author Affiliations
Qiaofeng Tan, Tsinghua Univ. (China)
Yingbai Yan, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)
Minxian Wu, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 3879:
Micromachine Technology for Diffractive and Holographic Optics
Sing H. Lee; J. Allen Cox, Editor(s)

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