The optical design concept of SPICA-SAFARI

Willem Jellema; Bob Kruizinga; Huib Visser; Teun van den Dool; Carmen Pastor Santos; Josefina Torres Redondo; Martin Eggens; Marc Ferlet; Bruce Swinyard; Kjetil Dohlen; Doug Griffin; Luis Miguel Gonzalez Fernandez; Tomas Belenguer; Hideo Matsuhara; Mitsunobu Kawada; Yasuo Doi

doi:10.1117/12.927153

21 September 2012 The optical design concept of SPICA-SAFARI

Willem Jellema, Bob Kruizinga, Huib Visser, Teun van den Dool, Carmen Pastor Santos, Josefina Torres Redondo, Martin Eggens, Marc Ferlet, Bruce Swinyard, Kjetil Dohlen, Doug Griffin, Luis Miguel Gonzalez Fernandez, Tomas Belenguer, Hideo Matsuhara, Mitsunobu Kawada, Yasuo Doi

Author Affiliations +

Proceedings Volume 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave; 84420S (2012) https://doi.org/10.1117/12.927153
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The Safari instrument on the Japanese SPICA mission is a zodiacal background limited imaging spectrometer offering a photometric imaging (R ≈ 2), and a low (R = 100) and medium spectral resolution (R = 2000 at 100 μm) spectroscopy mode in three photometric bands covering the 34-210 μm wavelength range. The instrument utilizes Nyquist sampled filled arrays of very sensitive TES detectors providing a 2’x2’ instantaneous field of view. The all-reflective optical system of Safari is highly modular and consists of an input optics module containing the entrance shutter, a calibration source and a pair of filter wheels, followed by an interferometer and finally the camera bay optics accommodating the focal-plane arrays. The optical design is largely driven and constrained by volume inviting for a compact three-dimensional arrangement of the interferometer and camera bay optics without compromising the optical performance requirements associated with a diffraction- and background-limited spectroscopic imaging instrument. Central to the optics we present a flexible and compact non-polarizing Mach-Zehnder interferometer layout, with dual input and output ports, employing a novel FTS scan mechanism based on magnetic bearings and a linear motor. In this paper we discuss the conceptual design of the focal-plane optics and describe how we implement the optical instrument functions, define the photometric bands, deal with straylight control, diffraction and thermal emission in the long-wavelength limit and interface to the large-format FPA arrays at one end and the SPICA telescope assembly at the other end.

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Willem Jellema, Bob Kruizinga, Huib Visser, Teun van den Dool, Carmen Pastor Santos, Josefina Torres Redondo, Martin Eggens, Marc Ferlet, Bruce Swinyard, Kjetil Dohlen, Doug Griffin, Luis Miguel Gonzalez Fernandez, Tomas Belenguer, Hideo Matsuhara, Mitsunobu Kawada, and Yasuo Doi "The optical design concept of SPICA-SAFARI", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84420S (21 September 2012); https://doi.org/10.1117/12.927153

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