Design of the optics for an imaging classic mount multi-etalon spectro-polarimeter for the next generation of ground-based solar telescopes

V. Greco; F. Cavallini

doi:10.1117/12.896824

30 September 2011 Design of the optics for an imaging classic mount multi-etalon spectro-polarimeter for the next generation of ground-based solar telescopes

V. Greco, F. Cavallini

Author Affiliations +

Proceedings Volume 8172, Optical Complex Systems: OCS11; 817219 (2011) https://doi.org/10.1117/12.896824
Event: SPIE Optical Systems Design, 2011, Marseille, France

Abstract

In designing the optics of an imaging classic mount multi-étalon spectro-polarimeter as a post-focus instrument for the next generation of ground-based solar telescopes (Advanced Technology Solar Telescope, European Solar Telescope), many constraints must be considered. The large entrance pupil diameter of the telescope (4 m), the demanded large field of view (≥ 90 arcsec), high spectral resolving power (≥ 200000), and limited field-dependent blue-shift of the instrumental profile (≤ 3 FWHM) require Fabry-Pérot interferometers of large diameter (≥ 200 mm), lighted by highly collimated beams. This implies large optical elements and long optical paths. Moreover, to use interference pre-filters, placed between the interferometers to reduce the inter-reflections in axial-mount, with a relatively small diameter (≤ 70 mm), a "pupil adapter" should be included, with a further increase of the optical path length. Although a multi-étalon spectro-polarimeter works in quasi-monochromatic light, the Fraunhofer lines of interest cover a wide range of wavelengths (850 nm - 1650 nm), demanding a good chromatic aberration control. Finally, a low instrumental polarization (≤ 0.5 %) is required to allow a high polarimetric precision. In this paper a diffraction limited optical solution is described, fulfilling all the above requirements in a relative small volume.

Citation Download Citation

V. Greco and F. Cavallini "Design of the optics for an imaging classic mount multi-etalon spectro-polarimeter for the next generation of ground-based solar telescopes", Proc. SPIE 8172, Optical Complex Systems: OCS11, 817219 (30 September 2011); https://doi.org/10.1117/12.896824

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