Suppression of higher diffraction orders using quasiperiodic array of rectangular holes with large size tolerance

Wei Lai; Chen Yong; Wang Shaoyi; Fan Quanping; Zhang Qiangqiang; Zhang Zhong; Wang Zhanshan; Cao Leifeng

doi:10.11884/HPLPB202032.200117

Volume 32 Issue 7

Jun. 2020

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Wei Lai, Chen Yong, Wang Shaoyi, et al. Suppression of higher diffraction orders using quasiperiodic array of rectangular holes with large size tolerance[J]. High Power Laser and Particle Beams, 2020, 32: 072002. doi: 10.11884/HPLPB202032.200117

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Wei Lai, Chen Yong, Wang Shaoyi, et al. Suppression of higher diffraction orders using quasiperiodic array of rectangular holes with large size tolerance[J]. High Power Laser and Particle Beams, 2020, 32: 072002. doi: 10.11884/HPLPB202032.200117

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Suppression of higher diffraction orders using quasiperiodic array of rectangular holes with large size tolerance

doi: 10.11884/HPLPB202032.200117

1.
Key Laboratory of Advanced Micro-structured Materials MOE, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2.
Research Center of Laser Fusion, CAEP, Mianyang 621900, China

Funds: National Key Research and Development Program of China (2017YFA0206001); National Natural Science Foundation of China (11805179)

More Information

Author Bio:
Wei Lai (1983—), male, PhD candidate, engaged in X-ray optics and plasma diagnostics; future718@yeah.net
Corresponding author: Cao Leifeng (1967—), male, PhD, engaged in X-ray optics and plasma diagnostics; leifeng.cao@caep.cn
Received Date: 2020-05-11
Rev Recd Date: 2020-06-23
Publish Date: 2020-06-24

Abstract

Abstract

Advances in basic and applied research of conventional grating have been attracting much attention from optical engineering community. However, the higher orders diffraction contamination degrades the spectral purity obtained by conventional gratings seriously. Many designs of single-order or quasi-single-order gratings have been proposed to suppress higher-order diffraction contributions, however, their inhibitive effects on the higher order diffractions are restrained by the processing accuracy unavoidably. In this paper, we propose a grating that incorporates a quasi-periodical array of rectangular holes, and achieves larger tolerance of processing errors compared with the previously designed gratings by optimizing the probability density distribution function of the holes. This paper describes an analytical study of the diffraction property of this grating. Theoretical calculations reveal that the grating completely suppresses the 2^nd, 3^rd, and 4^th orders diffractions, and the ratio of the 5^th order diffraction efficiency to that of the 1^st is as low as 0.01% even if relative errors for hole sizes exceed 20%, which greatly decreases the required processing accuracy.
- single-order diffraction grating,
- X-ray,
- spectrometer,
- tolerance of processing errors

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References(21)

References

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