Cryotransmittance and -reflectance of filters and beamsplitters for the SIRTF infrared array camera

Kenneth P. Stewart; Manuel A. Quijada

doi:10.1117/12.406543

16 November 2000 Cryotransmittance and -reflectance of filters and beamsplitters for the SIRTF infrared array camera

Proceedings Volume 4131, Infrared Spaceborne Remote Sensing VIII; (2000) https://doi.org/10.1117/12.406543
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The Space Infrared Telescope Facility Infrared Array Camera (IRAC) uses two dichroic beamsplitters, four bandpass filters, and four detector arrays to acquire images in four channels at wavelengths between 3 and 10 micrometers . Accurate knowledge of the pass bands is necessary because, in order to meet the science objectives, IRAC is required to do 2% relative photometry in each band relative to the other bands. We report the in-band and out-of-band polarized transmittance and reflectance of these optical elements measured near the instrument operating temperature of 1.4 K. Details of the experimental apparatus, which include a continuous flow liquid helium optical cryostat and a Fourier transform infrared spectrometer are discussed.

Citation Download Citation

Kenneth P. Stewart and Manuel A. Quijada "Cryotransmittance and -reflectance of filters and beamsplitters for the SIRTF infrared array camera", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); https://doi.org/10.1117/12.406543

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