JWST tunable filter imager: etalon prototype test results

D. Touahri; P. Cameron; C. Evans; E. Greenberg; N. Rowlands; A. Scott; R. Doyon; M. Beaulieu; O. Djazovski

doi:10.1117/12.790282

12 July 2008 JWST tunable filter imager: etalon prototype test results

D. Touahri, P. Cameron, C. Evans, E. Greenberg, N. Rowlands, A. Scott, R. Doyon, M. Beaulieu, O. Djazovski

Proceedings Volume 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter; 701038 (2008) https://doi.org/10.1117/12.790282
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

We present the prototyping results and laboratory characterization of a narrow band Fabry-Perot etalon flight model which is one of the wavelength selecting elements of the Tunable Filter Imager. The latter is a part of the Fine Guidance Sensor which represents the Canadian contribution to NASA's James Webb Space Telescope. The unique design of this etalon provides the JWST observatory with the ability to image at 30 Kelvin, a 2.2'x2.2' portion of its field of view in a narrow spectral bandwidth of R~100 at any wavelength ranging between 1.6 and 4.9 μm (with a gap in coverage between 2.5 and 3.2 μm). Extensive testing has resulted in better understanding of the thermal properties of the piezoelectric transducers used as an actuation system for the etalon gap tuning. Good throughput, spectral resolution and contrast have been demonstrated for the full wavelength range.

Citation Download Citation

D. Touahri, P. Cameron, C. Evans, E. Greenberg, N. Rowlands, A. Scott, R. Doyon, M. Beaulieu, and O. Djazovski "JWST tunable filter imager: etalon prototype test results", Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 701038 (12 July 2008); https://doi.org/10.1117/12.790282

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