Fraser A. Pike,1 Aurélien Benoit,1 David G. MacLachlan,1 Calum A. Ross,1 Robert J. Harrishttps://orcid.org/0000-0002-8518-4640,2 Sebastiaan Y. Haffert,3,4 Itandehui Gris-Sánchez,5,6 Timothy A. Birks,5 Robert R. Thomson1
1Heriot-Watt Univ. (United Kingdom) 2Landessternwarte Heidelberg (Germany) 3Leiden Observatory, Leiden Univ. (Netherlands) 4Steward Observatory, The Univ. of Arizona (United States) 5Univ. of Bath (United Kingdom) 6Univ. Politècnica de València (Spain)
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We report on the conception and the fabrication of a 3D photonic reformatter of 73 waveguides and its associated opaque mask in a wide collaboration to develop a multi-core fiber-fed integral field spectrograph (MCIFU) centered on the Jband. The reformatter is a 3D structure that light from the input quasi-hexagonal multicore fiber is spread out by rearrangement to avoid individual core spectra overlapping when the light is dispersed. The reformatter is fabricated using ultrafast laser inscription (ULI) in a borosilicate glass of 20 mm length. Using a similar ULI process, a 73-hole mask was fabricated in silica glass that precisely matched the waveguides at the output of the reformatter. The output surface of the mask was coated with a 120 nm layer of chromium to block scattered light generated in the bulk material and enhance the signal-to-noise. All inscribed waveguides, characterized using a stable laser centered at 1310 nm from the multicore fiber to the output mask, present consistent single-mode output behavior with a maximum throughput exceeding 60%. Over the 73 cores, the average throughput was measured at 40%. First observations of the full MCIFU device during on-sky measurements have shown promising results to the potential of this novel fiber integral field unit.
Fraser A. Pike,Aurélien Benoit,David G. MacLachlan,Calum A. Ross,Robert J. Harris,Sebastiaan Y. Haffert,Itandehui Gris-Sánchez,Timothy A. Birks, andRobert R. Thomson
"Multi-core fiber–fed integral field spectrograph (MCIFU) – III: an ultrafast laser inscribed photonic reformatter and mask", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145166 (13 December 2020); https://doi.org/10.1117/12.2559197
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Fraser A. Pike, Aurélien Benoit, David G. MacLachlan, Calum A. Ross, Robert J. Harris, Sebastiaan Y. Haffert, Itandehui Gris-Sánchez, Timothy A. Birks, Robert R. Thomson, "Multi-core fiber–fed integral field spectrograph (MCIFU) – III: an ultrafast laser inscribed photonic reformatter and mask," Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145166 (13 December 2020); https://doi.org/10.1117/12.2559197