Antireflective coatings for the red camera of WEAVE spectrograph

R. Ortiz; E. Carrasco; G. Páez; J. Reyes; Andrea Hidalgo; Gavin Dalton; Scott Trager; J. Alfonso L. Aguerri; Piercarlo Bonifacio; Antonella Vallenari; Don Carlos Abrams; Kevin Middleton

doi:10.1117/12.2313955

10 July 2018 Antireflective coatings for the red camera of WEAVE spectrograph

R. Ortiz, E. Carrasco, G. Páez, J. Reyes, Andrea Hidalgo, Gavin Dalton, Scott Trager, J. Alfonso L. Aguerri, Piercarlo Bonifacio, Antonella Vallenari, Don Carlos Abrams, Kevin Middleton

Author Affiliations +

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107065G (2018) https://doi.org/10.1117/12.2313955
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

In this work we present the coatings of the spectrograph red camera of WEAVE -the new multiobject survey facility for the 4.2m William Herschel Telescope. The initial requirements of WEAVE red camera lenses, with reflectances as low as 0.4% through the wavelength interval from 590 nm to 959 nm at angles of incidence of 18° +/- 17° represented a challenge for both design and production. Based on initial requirements, several solutions to the same problem were achieved and tested. The customized designs have been continuously improved through theoretical and experimental approximations. From transmittance measurements at normal incidence we developed a method to determine the reflectance at different angles of incidence. We show the designs and coating transmittance obtained for the four glasses on test runs to guarantee that the designs were achievable experimentally. Additionally, we present the reflectance obtained on the lenses of the the first four lenses of WEAVE red camera.

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R. Ortiz, E. Carrasco, G. Páez, J. Reyes, Andrea Hidalgo, Gavin Dalton, Scott Trager, J. Alfonso L. Aguerri, Piercarlo Bonifacio, Antonella Vallenari, Don Carlos Abrams, and Kevin Middleton "Antireflective coatings for the red camera of WEAVE spectrograph", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107065G (10 July 2018); https://doi.org/10.1117/12.2313955

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KEYWORDS

Reflectivity

Cameras

Antireflective coatings

Lenses

Spectrographs

Transmittance

Optical coatings

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