Abstract

Interferometric texts were performed on a 1.8-m ULE lightweight mirror at different uniform temperature conditions to determine figure changes due to expansion coefficient inhomogeneity. The conclusions of the experiment were: (1) The rms value of surface figure changes due to material inhomogeneities were found to be 0.036λ over a 42°C soak range at 6328 Å. (2) Time variations of surface figure change were found to be insignificant over periods of up to 6 days. (3) No hysteresis remained after returning to figuring temperature (the measurement uncertainty was less than 0.023λ rms at λ = 6328 Å). (4) Analytical predictions of surface figure change based on α inhomogeneity data were in close agreement with measurements.

© 1972 Optical Society of America

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, and Ai Takahashi
Appl. Opt. 49(20) 3941-3948 (2010)

Hexagonal vs Triangular Core Lightweight Mirror Structures

W. P. Barnes
Appl. Opt. 11(12) 2748-2751 (1972)

Thermal Expansion Measurements on Four Optical Materials from Room Temperature to 10 K

James Steve Browder and Stanley S. Ballard
Appl. Opt. 11(4) 841-843 (1972)

Homogeneity of Optical Glasses

F. Reitmayer and E. Schuster
Appl. Opt. 11(5) 1107-1111 (1972)

Apparatus for Measuring the Thermal Expansion of Optical Materials from 30°C to 250°C

John F. Ebersole, Stanley S. Ballard, and James Steve Browder
Appl. Opt. 11(4) 844-848 (1972)