Optical design for Antarctic Bright Star Survey Telescope

Zhengyang Li; Haipin Lu; Xiangyan Yuan

doi:10.3788/COL201513.111101

Chinese Optics Letters, Volume. 13, Issue 11, 111101(2015)

Optical design for Antarctic Bright Star Survey Telescope

Zhengyang Li^1,2、*, Haipin Lu^1,2, and Xiangyan Yuan^1,2

¹National Astronomical Observatories/Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing 210042, China

²Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing 210042, China

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Figures & Tables(13)

Fig. 1. Schematic drawing of R–C telescope.

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Fig. 2. BSST optical layout of open-band configuration. (The filter is located before the insulated window).

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Fig. 3. Image spot diagram of BSST (the box is 60 μm).

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$Diffraction-encircled energy layout.$

Fig. 4. Diffraction-encircled energy layout.

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Fig. 5. Resulting 80% encircled energy diameters.

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Fig. 6. Residual astigmatism and coma field behavior (the arrows on the maps show the amplitude and direction of the aberrations sampling from various fields).

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Fig. 7. Astigmatism and coma field behavior of tilting secondary mirror around the CFP.

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Fig. 8. Astigmatism and coma field behavior of translating secondary mirror.

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Fig. 9. BSST image of 120 s exposure in the $R$ band ( $1200 pixels \times 1200 pixels$ ).

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Table 1. Initial Optical Configuration of BSST
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Table 1. Initial Optical Configuration of BSST
Optical Element Radius (mm) Conic Coefficient Distance (mm)
Primary Mirror −800 −1.33 227.1
Secondary Mirror −639.9 −14.16 357.1

Table 2. Optical Configuration of BSST

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Table 2. Optical Configuration of BSST

Optical Element	Radius (mm)	Conic Coefficient	Thickness (mm)	Diameter (mm)	Glass
Defrost Window	Infinity	–	20	324	Fused silica
Defrost Window	Infinity	–	280	324	Fused silica
Primary Mirror	−800	−1.519	235	315	Zerodur
Secondary Mirror	−606	−14.443	222	113	Zerodur
Lens 1	358	–	15	90	Fused silica
Lens 1	−159.9	–	10	90	Fused silica
Lens 2	−159.9	–	8	84	TF3
Lens 2	−239.66	–	13	84	TF3
Lens 3	−123.59	–	8	80	Fused silica
Lens 3	Infinity	–	40	80	Fused silica
Insulated Window	Infinity	–	8	90	Fused silica
Insulated Window	Infinity	–	18.5	90	Fused silica
CCD Window	Infinity	–	9.5	90	Fused silica
CCD Window	Infinity	–	8	90	Fused silica
Focal Plane	Infinity	–		70	–

Table 3. Parameters of Filters
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Table 3. Parameters of Filters
Filter Central Wavelength (nm) Bandwidth (nm) Transmission (%) Diameter (mm)
B 440 100 $> 50$ 50
V 550 90 $> 70$ 50
R 760 250 $> 70$ 50
$H - α$ 656.3 10 $> 50$ 25
$H - β$ 486.1 10 $> 40$ 25
O–3 500.7 10 $> 60$ 25

Table 4. Tolerance Values of BSST

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Table 4. Tolerance Values of BSST

Manufactory Error Budget
Items	Thickness (mm)	Radius (mm)	Conic	Nominal
Primary	–	$\pm 1 mm$	$\pm 0.0001$	(−800; −1.519)
Secondary	–	$\pm 1 mm$	$\pm 0.0001$	(−606; −14.443)
Lens	−0.1	–	0	(15, 8, 8)
Alignment Error Budget
DOF	Decenter (mm)		Tilt	Position (mm)
Primary	DATUM
Secondary	$\pm 0.06$		$\pm 1^{'}$	$\pm 0.4$
Corrector	$\pm 0.1$		$\pm {3.6}^{'}$	$\pm 0.4$
Lens Space	–		–	$\pm 0.1$
Use Focal Length as Compensator