Cryogenic optical testing of an 800mm lightweight C/SiC composite mirror mounted on a C/SiC optical bench

Hidehiro Kaneda; Masataka Naitoh; Tadashi Imai; Yoshio Tange; Keigo Enya; Haruyoshi Katayama; Kenta Maruyama; Takao Nakagawa; Takashi Onaka; Masahiro Suganuma; Ryoko Kano; Yuichi Kiriyama; Tatsuya Mori; Ai Takahashi

doi:10.1364/AO.49.003941

Applied Optics
Vol. 49,
Issue 20,
pp. 3941-3948
(2010)
•https://doi.org/10.1364/AO.49.003941

Cryogenic optical testing of an $800 mm$ lightweight C/SiC composite mirror mounted on a C/SiC optical bench

Hidehiro Kaneda, Masataka Naitoh, Tadashi Imai, Yoshio Tange, Keigo Enya, Haruyoshi Katayama, Kenta Maruyama, Takao Nakagawa, Takashi Onaka, Masahiro Suganuma, Ryoko Kano, Yuichi Kiriyama, Tatsuya Mori, and Ai Takahashi

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Hidehiro Kaneda, Masataka Naitoh, Tadashi Imai, Yoshio Tange, Keigo Enya, Haruyoshi Katayama, Kenta Maruyama, Takao Nakagawa, Takashi Onaka, Masahiro Suganuma, Ryoko Kano, Yuichi Kiriyama, Tatsuya Mori, and Ai Takahashi, "Cryogenic optical testing of an 800mm lightweight C/SiC composite mirror mounted on a C/SiC optical bench," Appl. Opt. 49, 3941-3948 (2010)

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Abstract

We tested the optical performance at cryogenic temperatures of an $800 mm$ diameter lightweight mirror, consisting of carbon-fiber reinforced silicon carbide and with a mass of $11.2 kg$ . The ceramic composite of the mirror was HB-Cesic, developed by ECM, Germany, and Mitsubishi Electric Corporation, Japan. The test was carried out while the mirror was mounted, via Invar stress relief supports, on a lightweight optical bench also made of HB-Cesic. During the test, both the mirror and the optical bench were cooled to $18 K$ in a liquid-helium chamber. The test consisted of measuring the mirror's change of surface figure with an interferometer installed outside the cryo-chamber. The cryogenic deformation of the mirror was $110 nm$ RMS with no significant residual deformation after cooling, which is very promising for the applicability of the HB-Cesic composite to large lightweight cryogenic space optics.

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Properties	Values
Density	$2.97 g {cm}^{- 3}$
Young’s modulus	$350 GPa$
Bending strength	$320 MPa$
CTE (at $300 K$ )	$2.3 ppm K^{- 1}$
Thermal conductivity (at $300 K$ )	$125 W m^{- 1} K^{- 1}$
Fracture toughness $K_{IC}$	$3.6 MPa m^{1 / 2}$

Item	Requirement	Results
Surface figure error (at $300 K$ )	$63 nm$ RMS ( $0.1 λ$ )	$61 nm$ RMS ( $0.096 λ$ )
Clear aperture	$780 \pm 1 mm$	Outer: $740 mm$ Inner: $280 mm$
Surface roughness	$< 10 nm$ RMS	$0.8 - 1.2 nm$ RMS
Radius of curvature	$1592 \pm 2 mm$	$1591 - 1593 mm$
Weight	$10.8 kg$ (designed)	$11.2 kg$

Properties	Values
Density	$2.97 g {cm}^{- 3}$
Young’s modulus	$350 GPa$
Bending strength	$320 MPa$
CTE (at $300 K$ )	$2.3 ppm K^{- 1}$
Thermal conductivity (at $300 K$ )	$125 W m^{- 1} K^{- 1}$
Fracture toughness $K_{IC}$	$3.6 MPa m^{1 / 2}$

Item	Requirement	Results
Surface figure error (at $300 K$ )	$63 nm$ RMS ( $0.1 λ$ )	$61 nm$ RMS ( $0.096 λ$ )
Clear aperture	$780 \pm 1 mm$	Outer: $740 mm$ Inner: $280 mm$
Surface roughness	$< 10 nm$ RMS	$0.8 - 1.2 nm$ RMS
Radius of curvature	$1592 \pm 2 mm$	$1591 - 1593 mm$
Weight	$10.8 kg$ (designed)	$11.2 kg$

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Applied Optics