Double-Grating Minitype Flat-Field Holographic Concave Grating Spectrograph

Peng, 孔鹏 Kong; Yuguo, 唐玉国 Tang; Bayanheshig, 巴音贺希格; Xiangdong, 齐向东 Qi; Wenhao, 李文昊 Li; Jinjiang, 崔锦江 Cui

doi:10.3788/aos201333.0105001

Cited by 3 publications

(1 citation statement)

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“…The dual-gratings is an innovative structure that has been successfully used in many cases to improve the spectral resolution or spectral range of the system. In 2011, Kong Peng et al studied a double-concave grating imaging spectrometer, which successfully improved the spectral resolution of the system [13]. In 2018, Liu studied a multi-grating spatial heterodyne spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Dual-Gratings Imaging Spectrometer

et al. 2021

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Common dispersive-type spectroscopic instruments include prism-type and grating-type, usually using a single dispersive element. The continuous imaging band is always limited by the dispersion angle. When it is necessary to image two wavebands with an ultra-spectral resolution that are far apart, the imaging is difficult due to the large diffraction angle. To broaden the spectral coverage of the imaging spectrometer, in this paper, we propose a dual-gratings imaging spectrometer with two independently rotating gratings. In this proposed system, two very far apart wavelength bands can be imaged in the adjacent areas by adjusting the angle of the dual gratings. This greatly expands the spectral coverage of the imaging spectrometer. Currently, the only application area considered for this instrument is solar applications. In this article, we present the optical system of the dual-gratings imaging spectrometer, illustrate several advantages of the new structure, and discuss new problems caused by the dual-gratings, which are referred to as overlap between two spectra and double image offset. We deduced the calculation process of the dual grating rotation angle, the relationship between the final acquired image and the slit, the relationship between the angle change between the dual gratings and the double image offset, and the relationship between the MTF upper limit reduction and the spatial frequency. This article also summarizes the shortcomings of this structure and studies the applicable fields under these shortcomings. At last, we simulate a dual-gratings imaging spectrometer system, compare this scheme with two traditional schemes, and conclude that this instrument has certain practical significance.

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Section: Introductionmentioning

confidence: 99%

Dual-Gratings Imaging Spectrometer

et al. 2021

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Fabrication of a concave grating with a large line spacing via a novel dual-beam interference lithography method

Zhou³

et al. 2016

Opt. Express

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We introduce a novel dual-beam interference lithography (IL) method that makes it possible to fabricate a concave grating with a large line spacing. A concave lens is placed between two point sources for spatial interference and a concave substrate to produce the grating pattern. The original positions of the two point sources are separated by the concave lens, which permits the IL method to fabricate a concave grating that bypasses the line spacing limitation of the conventional IL system. A concave grating with a line spacing of about 3.8 μm was fabricated and fitted inside a miniature spectrometer. The enlarged line spacing reduces the detector length by 66.5%, while keeping the resolution better than 1.5 nm over a wide spectral band (360 - 825 nm).

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Study on the temperature field loaded by a shaped laser beam on the top surface of a cylinder head for thermal fatigue test

Nie

et al. 2014

J. Eur. Opt. Soc.-Rapid Publ.

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In thermal fatigue test, the key point is whether the temperature field on the top surface of cylinder head induced by the heat source can well match it in real service. In order to produce the target temperature field in service which is measured by thermocouples, shaped laser beam generated by diffractive optics element (DOE) is chosen as the heat source to irradiate on the top surface of cylinder head. The DOE is designed based on the Gerchberg-Saxton (GS) algorithm and the simulated temperature field is calculated by finite element model (FEM). The results show that the simulated and experimental temperature field can well match the target one which demonstrates that this method is feasible to produce the target temperature field and can be used in thermal fatigue test.

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Double-Grating Minitype Flat-Field Holographic Concave Grating Spectrograph

Cited by 3 publications

References 0 publications

Dual-Gratings Imaging Spectrometer

Dual-Gratings Imaging Spectrometer

Fabrication of a concave grating with a large line spacing via a novel dual-beam interference lithography method

Study on the temperature field loaded by a shaped laser beam on the top surface of a cylinder head for thermal fatigue test

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