Cryogenic focus measurement system for a wide-field infrared space telescope

Samuel S. Condon; Stephen Padin; James Bock; Howard Hui; Phillip Korngut; Chi Nguyen; Jordan Ostby

doi:10.1364/AO.514784

Applied Optics
Vol. 63,
Issue 13,
pp. 3453-3461
(2024)
•https://doi.org/10.1364/AO.514784

Cryogenic focus measurement system for a wide-field infrared space telescope

Samuel S. Condon, Stephen Padin, James Bock, Howard Hui, Phillip Korngut, Chi Nguyen, and Jordan Ostby

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Samuel S. Condon, Stephen Padin, James Bock, Howard Hui, Phillip Korngut, Chi Nguyen, and Jordan Ostby, "Cryogenic focus measurement system for a wide-field infrared space telescope," Appl. Opt. 63, 3453-3461 (2024)

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Abstract

We describe a technique for measuring focus errors in a cryogenic, wide-field, near-infrared space telescope. The measurements are made with a collimator looking through a large vacuum window, with a reflective cold filter to reduce the background thermal infrared loading on the detectors and optics. The vacuum window and cold filter introduce a wavefront error that we characterize using an autocollimating microscope. For the 200 mm diameter aperture $f/3$ space telescope SPHEREx, we achieve a focus position measurement with a ${\sim}15\;{\unicode{x00B5}{\rm m}}$ systematic and a ${\sim}5\;{\unicode{x00B5}{\rm m}}$ statistical error.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Parameter	Value
Aperture	200 mm
Focal length	600 mm
Field of view	${11.3}^{\circ} \times {3.5}^{\circ}$
Detectors	$6 \times H 2 R G : 2048 \times 2048$ , $18 \times 18 µ m p i x e l s ({6.2}^{''} \times {6.2}^{''})$
Wavelength range	Band 1: $λ = 0.75 - 1.11 µ m$ , $R = 41$
	Band 2: $λ = 1.11 - 1.64 µ m$ , $R = 41$
	Band 3: $λ = 1.64 - 2.42 µ m$ , $R = 41$
	Band 4: $λ = 2.42 - 3.82 µ m$ , $R = 35$
	Band 5: $λ = 3.82 - 4.42 µ m$ , $R = 110$
	Band 6: $λ = 4.42 - 5.00 µ m$ , $R = 130$

Contribution	Focus Shift (µm)	Error (µm)
1) Microscope alignment	0	1.7
2) Collimator calibration	0	5.6
3) Collimator best focus calculation	0	4.5
4) Collimator stability	0	5.6
5) Power versus radius for window assembly	66.9	8.9
6) Power versus $λ$ for window assembly	16.7	5.6
7) Telescope focus measurement	0	5.6
TOTAL	83.6 (sum)	15.1 (quadrature sum)

Parameter	Value
Aperture	200 mm
Focal length	600 mm
Field of view	${11.3}^{\circ} \times {3.5}^{\circ}$
Detectors	$6 \times H 2 R G : 2048 \times 2048$ , $18 \times 18 µ m p i x e l s ({6.2}^{''} \times {6.2}^{''})$
Wavelength range	Band 1: $λ = 0.75 - 1.11 µ m$ , $R = 41$
	Band 2: $λ = 1.11 - 1.64 µ m$ , $R = 41$
	Band 3: $λ = 1.64 - 2.42 µ m$ , $R = 41$
	Band 4: $λ = 2.42 - 3.82 µ m$ , $R = 35$
	Band 5: $λ = 3.82 - 4.42 µ m$ , $R = 110$
	Band 6: $λ = 4.42 - 5.00 µ m$ , $R = 130$

Contribution	Focus Shift (µm)	Error (µm)
1) Microscope alignment	0	1.7
2) Collimator calibration	0	5.6
3) Collimator best focus calculation	0	4.5
4) Collimator stability	0	5.6
5) Power versus radius for window assembly	66.9	8.9
6) Power versus $λ$ for window assembly	16.7	5.6
7) Telescope focus measurement	0	5.6
TOTAL	83.6 (sum)	15.1 (quadrature sum)

Abstract

Data availability

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Tables (2)

Equations (1)

Applied Optics