Design method for a small F-number two-material uniform dispersion immersion grating imaging spectrometer

Liu, Yang; Li, Jinhuan; Zhang, Pengfei; Zhou, Aiming; Wang, Xiaoxu; Wang, Junbo; Li, Bo; Lin, Guanyu; Gu, Guochao; Li, Hanshuang

doi:10.1364/oe.502867

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Different micro-pupils correspond to different field positions, allowing for the integration of field information through these micro-pupils. As a result, there is no need for scanning, and all the information from the entire field is obtained in a single scan, ensuring the accuracy of simultaneously acquired information [11][12][13].…”

Section: Basic Theory Of Lenslet-array Integral Field Spectrometer Pr...mentioning

confidence: 99%

Analysis and Optical System Design of the Lenslet-Array Integral Field Spectrometer

Liu,

Cui,

Shi

et al. 2023

Photonics

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To address the problem of slit limitation in traditional slit imaging spectrometers, which hampers fast the identification, efficient tracking, and precise avoidance of faint targets in lunar orbit, this article proposes a lenslet-array integral field spectrometer structure that is free of slits, static, and that is fast and efficient for the visible-to-near-infrared wavelength band. Firstly, the field of view segmentation model is analyzed, and the requirement of the telecentric degree of the pre-imaging system is obtained. Secondly, the influence of aberrations, such as spherical aberration and coma distortion on the micro-pupil dispersion model is analyzed. Based on this, the pre-imaging system is designed to meet the requirements of aberration correction and the telecentricity of the system. Finally, the structure of the spectral system is designed, and the integrated system is optimized. The smile of the lenslet-array integral field spectrometer is ±1 nm, and the MTF is greater than 0.7 at 60 lp/mm and close to the diffraction limit.

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Section: Basic Theory Of Lenslet-array Integral Field Spectrometer Pr...mentioning

confidence: 99%

Analysis and Optical System Design of the Lenslet-Array Integral Field Spectrometer

Liu,

Cui,

Shi

et al. 2023

Photonics

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Stray light analysis and suppression of a UV multiple sub-pupil ultra-spectral imager

Zhang,

Li,

Zhi

et al. 2024

Appl. Opt.

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A multiple sub-pupil ultra-spectral imager system for simultaneous detection of multiple substances is proposed. By employing pupil separation prisms and grating multilevel spectra, the system achieves simultaneous detection of three spectral channels with a single spectrometer and detector, featuring an ultra-high spectral resolution of 0.1 nm. However, due to simultaneous detection of three channels, the system suffers from significant stray light issues. In response to this problem, a UV multiple sub-pupil ultra-spectral imager system optical-machinery model is constructed in this article. The main sources of stray light are determined through theoretical derivation and simulation analysis, and the level of stray light in the system is analyzed using simulation analysis software. A structure for stray light suppression is optimized, and the use of multispectral filters is proposed to suppress stray light generated by spectral crosstalk in the system. The effectiveness of stray light suppression is evaluated based on the energy response of the receiving surface. The analysis results show that after optimization, the level of stray light in the T1 channel is reduced from 1.4% to 0.65‰, in the T2 channel from 3.0‰ to 0.5‰, and in the T3 channel from 0.16‰ to 0.05‰. Therefore, it can be concluded that the proposed method for stray light suppression in the UV multiple sub-pupil ultra-spectral imager system addressed in this article meets the indicator requirements.

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Automatic control method of spherical wave exposure interference field based on the Moiré alignment principle

Zhang,

Wang,

Sun

et al. 2024

Opt. Express

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Aberration-corrected gratings are widely applied in spectral analysis owing to their dispersion and convergence properties. However, the phase distribution error of the exposure interference field reduces the accuracy of the groove density distribution, making it difficult to satisfy the needs of high-precision spectral instruments. Therefore, this paper establishes an error model for the phase distribution of the spherical wave exposure interference field, describing the relationship between the phase distribution error and the recording parameter error. This model is used to propose a method of automatically controlling a spherical wave exposure interference field based on Moiré alignment principle. This method automatically measures the phase of the interference field by extracting the phase from the Moiré fringes generated by the superposition of the interference field and the reference grating, and then inversely calculates the recording parameters. The measurement results are then fed back to the automatic calibration mechanism for compensation, thereby achieving automatic control of the exposure interference field. Applying this method to calibrate the exposure interference field reduces the average relative error of the groove density of the produced plane aberration-corrected grating by two orders of magnitude compared with that of the traditional control method. This method significantly enhances the control accuracy for the spherical wave exposure interference field, improving the distribution accuracy of the groove density of the aberration-corrected grating, thereby supporting spectral analysis.

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Design method for a small F-number two-material uniform dispersion immersion grating imaging spectrometer

Cited by 3 publications

References 25 publications

Analysis and Optical System Design of the Lenslet-Array Integral Field Spectrometer

Analysis and Optical System Design of the Lenslet-Array Integral Field Spectrometer

Stray light analysis and suppression of a UV multiple sub-pupil ultra-spectral imager

Automatic control method of spherical wave exposure interference field based on the Moiré alignment principle

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