Acta Optica Sinica, Volume. 42, Issue 16, 1605002(2022)
Diffraction Characteristics of Orthogonal Phase Grating Based on Spatial Light Modulator
In this paper, a digital orthogonal phase grating with adjustable period and phase modulation depth is simulated by using a programmable spatial light modulator. On the basis of analyzing the structure of orthogonal phase grating, its transmission function, far-field diffraction patterns, and diffraction efficiency are derived and calculated, and the influence of grating period T and phase modulation depth ? on the diffraction characteristics of orthogonal phase grating is discussed. The simulation and experimental results show that as ? increases from 0 to π, the relative intensity of zero-order light decreases gradually, and the intensity of eight first-order lights enhances. When ? equals π, the relative intensity of zero-order light reaches the minimum value of 0.25, and the maximum diffraction efficiency of first-order light is 56.96%. As ? increases from π to 2π, the relative intensity of zero-order light increases gradually, and the intensity of eight first-order lights decreases. This research provides a theoretical basis for the application of orthogonal phase grating.
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Zhongsheng Zhai, Yuansheng Huang, Qinyang Li, Xin Yu, Lü Qinghua, Boya Xie, Zhen Zeng. Diffraction Characteristics of Orthogonal Phase Grating Based on Spatial Light Modulator[J]. Acta Optica Sinica, 2022, 42(16): 1605002
Category: Diffraction and Gratings
Received: Jan. 6, 2022
Accepted: Mar. 18, 2022
Published Online: Aug. 4, 2022
The Author Email: Qinghua Lü (linsa080@hbut.edu.cn)