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Updated: May 19, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Design of diffractive phase element for modulating the electric field at the out-of-focus plane in a lens system
Kun Huang1, Hongfang Gao, Guowei Cao
1Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, China.
Abstract:
We demonstrate an efficient method to design the diffractive phase element for modulating the electric field at the out-of-focus plane of a lens system by using an equivalent Fresnel diffraction in free space. In the monochromatic illumination, we show an example to certify the validity of our method experimentally. In the nonmonochromatic illumination, we theoretically display that the spectral beam splitting and highly confined intensity can be obtained simultaneously at the out-of-focus plane, which has the potential in the solar concentrating system and optical encryption.
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