Measuring Optical Performance of the Microshutter Arrays for the JWST NIRSpec

Details Measuring Optical Performance of the Microshutter Arrays for the JWST NIRSpec Measuring Optical Performance of the Microshutter Arrays for the JWST NIRSpec

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8607k&link_type=abstract

American Astronomical Society Meeting 210, #86.07; Bulletin of the American Astronomical Society, Vol. 39, p.195

Computer Science

Performance

Scientific paper

Two-dimensional programmable microshutter arrays (MSAs) have been developed at the NASA Goddard Space Flight Center for use on the James Webb Space Telescope (JWST) for object selection on the Near Infrared Multi-object Spectrograph (NIRSpec). These transmissive programmable masks will enable a highly capable multi-object spectrograph for JWST. The MSAs will allow 100 spectra to be obtained simultaneously, a capability which is essential for a primary scientific goal of the mission, to study primordial galaxies and the epoch of initial galaxy formation. These masks are designed to provide high transmission efficiency for the selected objects and high open to closed contrast ratio at the 35 K operating temperature of the NIRSpec. Given the large range of source brightnesses in a field, verifying the high required contrast for the microshutter is essential. We have developed a test system that is capable of measuring very high contrast ratios characteristic of the shutters by measuring their transmission in the open and closed states. Our tests show that we significantly exceed the NIRSpec contrast requirement of 2000/1. We discuss issues of measuring low level fluxes transmitted by the microshutters in the presence of open shutters, and the optical properties of the MSAs and their possible impact on the spectrometer performance and design.

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