Bonded mounts for small cryogenic optics

Daniel Vukobratovich; Ken A. Fetterhoff; James R. Myers; Paul D. Wheelwright; George R. Cunnington

doi:10.1117/12.406545

16 November 2000 Bonded mounts for small cryogenic optics

Daniel Vukobratovich, Ken A. Fetterhoff, James R. Myers, Paul D. Wheelwright, George R. Cunnington

Author Affiliations +

Proceedings Volume 4131, Infrared Spaceborne Remote Sensing VIII; (2000) https://doi.org/10.1117/12.406545
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Adhesive bonded mounting of small optics for use at cryogenic temperatures provides improved heat transfer, low optical surface distortion, and reduced cost in comparison with conventional flexural mounts. A design methodology based on the thermo-elastic properties of the adhesive and its interaction with the mounted optic is presented. Key factors in the selection of the appropriate adhesive are high thermal conductivity, a low elastic modulus, a low glass-transition temperature, good adhesion characteristics to optic and substrate, and low outgassing. A design example of 17-mm diameter, 2-mm thick circular polycrystalline germanium window used at a temperature of below 100 K is discussed. During cooling at a rate of more than 3 K/sec the temperature at the center of the window mounted in this way lags behind the mount by no more than 20 K at any instant, and reaches equilibrium with the mount in about 50 sec. Maximum optical surface deformation of the mounted optic is less than 0.031 waves RMS differential (1 wave equals 633 nm) for a temperature change of 300 K to 102 K. Predicted peak tensile stress is less than 17 MPa. The adhesive bonded mount is also simple and economical in comparison with the complex flexural mounts often used for cryogenic optics.

Citation Download Citation

Daniel Vukobratovich, Ken A. Fetterhoff, James R. Myers, Paul D. Wheelwright, and George R. Cunnington "Bonded mounts for small cryogenic optics", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); https://doi.org/10.1117/12.406545

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