Researching | Optical Design of 3-Order Solar Extreme Ultraviolet Narrowband Slitless Imaging Spectrometer

Acta Optica Sinica, Volume. 41, Issue 7, 0730003(2021)

Optical Design of 3-Order Solar Extreme Ultraviolet Narrowband Slitless Imaging Spectrometer

Yangguang Xing^1,2,3, Lin Li^1、*, Jilong Peng^2、**, Shanshan Wang^1、***, and Yinuo Cheng⁴

Author Affiliations

¹School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

²Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China

³National Key Laboratory of Science and Technology on Reliability and Environment Engineering, Beijing 100094, China

⁴Department of Precision Instrument, Tsinghua University, Beijing 100091, China

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Figures&Tables (25)

References (24)

Paper Information

Figures & Tables(25)

$Schematic of three-order slitless imaging spectrometer. (a) Optical layout of MOSES; (b) solar images with three diffraction orders by single snapshot$

Fig. 1. Schematic of three-order slitless imaging spectrometer. (a) Optical layout of MOSES; (b) solar images with three diffraction orders by single snapshot

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Fig. 2. Schematic of three-order slitless imaging spectrometer with new optical layout

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Fig. 3. Ray-tracing model for three-order slitless imaging spectrometer

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Fig. 4. Geometric optics model for off-axis hyperbolic mirror

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Fig. 5. Schematic of aberration-corrected EVLS grating

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Fig. 6. Sun flare spectrum from SDO/EVE

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Fig. 7. Optical layout of solar EUV slitless imaging spectrometer. (a) 2D optical layout; (b) 3D model diagram

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Fig. 8. Ruling density distribution of EVLS grating

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Fig. 9. Curve of aberration term of astigmatisms. (a) Tangential astigmatism for -1 order; (b) tangential astigmatism for +1 order; (c) sagittal astigmatism for -1 order; (d) sagittal astigmatism for +1 order

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Fig. 10. Curve of aberration term of coma. (a) Coma for -1 order; (b) coma for +1 order

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Fig. 11. Maximum grid distortion change with wavelength under marginal FOV. (a) -1 order; (b) +1 order

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Fig. 12. Variation of RMS radius of spot for -1 order. (a) RMS radius of spot versus wavelength in the different off-axis FOVs; (b) RMS radius of spot versus FOV in the different wavelength

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Fig. 13. Variation of RMS radius of spot for +1 order. (a) RMS radius of spot versus wavelength in the different off-axis FOVs; (b) RMS radius of spot versus FOV in the different wavelength

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Fig. 14. Spot diagrams in 0 order imaging plane under the different FOVs and RMS radius of spot versus FOV for 0 order. (a) Spot diagrams in 0 order imaging plane under the different FOVs; (b) RMS radius of spot versus FOV for 0 order

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$MTFs of design system under different diffraction orders. (a) -1 order; (b) +1 order; (c) 0 order$

Fig. 15. MTFs of design system under different diffraction orders. (a) -1 order; (b) +1 order; (c) 0 order

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$Diffraction enclosed energy to evaluate system’s spatial resolution. (a) -1 order; (b) +1 order; (c) 0 order$

Fig. 16. Diffraction enclosed energy to evaluate system’s spatial resolution. (a) -1 order; (b) +1 order; (c) 0 order

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$Spectral resolution simulation verification for ±1 diffraction orders. (a)(b) -1 order; (c)(d) +1 order$

Fig. 17. Spectral resolution simulation verification for ±1 diffraction orders. (a)(b) -1 order; (c)(d) +1 order

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Fig. 18. Transmission of Si filter with 0.1 μm thickness

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Fig. 19. Reflectance versus wavelength for SiC/Mg multilayer

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Fig. 20. Efficiency versus wavelength for EVLS grating

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Fig. 21. Effective area of slitless imaging spectrometer versus wavelength

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Table 1. Specifications of the solar EUV slitless imaging spectrometer

Table 1. Specifications of the solar EUV slitless imaging spectrometer

Instrument	Wavelength /nm	2D FOV /(arcmin×arcmin)	Spatialresolution /arcsec	Spectralresolution /(10^-4 nm)	Primarymirror	Secondarymirror	Length /mm
MOSES-06	29.4--31.4	10×20	0.6	30	SULS grating	Fold flat	2400
Our design	29.4--31.4	20×20	0.6	35	Hyperbola	EVLS grating	910

Table 2. F_jk terms with their associate aberrations
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Table 2. F_jk terms with their associate aberrations
Term Aberration
F₁₀ and F₀₁ Basic grating equation
F₂₀ Tangential astigmatism
F₀₂ Sagittal astigmatism
F₁₁ Off-axis defocusing
F₃₀ and F₂₁ Coma
F₁₂ Field curvature
F₄₀, F₂₂and F₀₄ Spherical aberration

Table 3. Specifications and optical element parameters for slitless imaging spectrometer

Table 3. Specifications and optical element parameters for slitless imaging spectrometer

Specification
Spectral range /nm		29.4--31.4
FOV /(arcmin×arcmin)		20×20
Spectral resolution /(10^-4 nm)		35
Spatial resolution /arcsec		0.6 (440 km)
Line-of-sight velocity /(km·s^-1)		>34.5
High cadence /s		<10
System focal length /mm		4500
Pixel size of detectors /μm		13 (2048×2048)
Envelope size of optical system /(mm×mm×mm)		910×310×60
Telescope design
R_T /mm		1520
Conic		-1.307
Δ /mm		80
Spectral imaging system design
Field stop size /(mm×mm)		4.5×4.5
$\frac{1}{d_{0}}$ /mm^-1		3600
m		+1 order, 0 order, and -1 order
Grating parameter	Initial		Optimum
r_A /mm	150		150
β	6^×		5.905^×
i /(°)	5.13		5.4
a /mm	360.000		352.906
b /mm	305.010		300.957
c /mm	302.425		300.034
ζ₂	-0.04448		-0.04736
ζ₃	-0.006852		-0.007201
Ruling area /(mm×mm)	25×25
Three independent detectors design
Order	Wavelength /nm		Tilt angle of detectors /(°)
-1 order	29.4--31.4		14.66
0 order	29.4--31.4		27.95
+1 order	29.4--31.4		32.71

Table 4. Periodic SiC/Mg multilayer parameters
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Table 4. Periodic SiC/Mg multilayer parameters
γ /(°) d / nm τ N δ_SiC-Mg /nm δ_Mg-SiC /nm
84.6 15.27 0.22 40 2.0 1.0

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Yangguang Xing, Lin Li, Jilong Peng, Shanshan Wang, Yinuo Cheng. Optical Design of 3-Order Solar Extreme Ultraviolet Narrowband Slitless Imaging Spectrometer[J]. Acta Optica Sinica, 2021, 41(7): 0730003

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Paper Information

Category: Spectroscopy

Received: Oct. 9, 2020

Accepted: Nov. 24, 2020

Published Online: Apr. 11, 2021

The Author Email: Li Lin (bit421@bit.edu.cn), Peng Jilong (JL_Peng@hotmail.com), Wang Shanshan (wshan@bit.edu.cn)

DOI:10.3788/AOS202141.0730003

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology