Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask

Fraser A. Pike; Aurelien Benoit; David G. MacLachlan; Calum A. Ross; Robert J. Harris; Sebastiaan Y. Haffert; Itandehui Gris-Sanchez; Timothy A. Birks; Robert R. Thomson

doi:10.1117/12.2559197

Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask

Fraser A. Pike, Aurelien Benoit, David G. MacLachlan, Calum A. Ross, Robert J. Harris, Sebastiaan Y. Haffert, Itandehui Gris-Sanchez, Timothy A. Birks, Robert R. Thomson

Department of Physics

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

4 Citations (SciVal)

Abstract

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.

Original language	English
Title of host publication	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV
Editors	Ramon Navarro, Roland Geyl
Place of Publication	U. S. A.
Publisher	SPIE
ISBN (Electronic)	9781510636897
DOIs	https://doi.org/10.1117/12.2559197
Publication status	Published - 13 Dec 2020
Event	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020 - Virtual, Online, USA United States Duration: 14 Dec 2020 → 22 Dec 2020

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11451
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020
Country/Territory	USA United States
City	Virtual, Online
Period	14/12/20 → 22/12/20

Funding

This work was funded by the UK Science and Technology Facilities Council (STFC) – STFC grant no. ST/N000625/1, and by the European Union’s Horizon 2020 research and innovation program under grant no. 730890 (OPTICON – Optical Infrared Coordination Network for Astronomy). FAP acknowledges support via an Engineering and Physical Sciences Research Council (EPSRC) iCASE studentship part funded by Renishaw.

Keywords

Astrophotonics
Exoplanets
High contrast imaging.
Integral field spectroscopy
Multi-core fiber
Photonic reformatter
Ultrafast Laser Inscription
Waveguides

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2559197

Cite this

Pike, F. A., Benoit, A., MacLachlan, D. G., Ross, C. A., Harris, R. J., Haffert, S. Y., Gris-Sanchez, I., Birks, T. A., & Thomson, R. R. (2020). Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask. In R. Navarro, & R. Geyl (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV Article 1145166 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11451). SPIE. https://doi.org/10.1117/12.2559197

Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask. / Pike, Fraser A.; Benoit, Aurelien; MacLachlan, David G. et al.
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV. ed. / Ramon Navarro; Roland Geyl. U. S. A.: SPIE, 2020. 1145166 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11451).

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

Pike, FA, Benoit, A, MacLachlan, DG, Ross, CA, Harris, RJ, Haffert, SY, Gris-Sanchez, I, Birks, TA & Thomson, RR 2020, Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask. in R Navarro & R Geyl (eds), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV., 1145166, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11451, SPIE, U. S. A., Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020, Virtual, Online, USA United States, 14/12/20. https://doi.org/10.1117/12.2559197

Pike FA, Benoit A, MacLachlan DG, Ross CA, Harris RJ, Haffert SY et al. Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask. In Navarro R, Geyl R, editors, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV. U. S. A.: SPIE. 2020. 1145166. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2559197

Pike, Fraser A. ; Benoit, Aurelien ; MacLachlan, David G. et al. / Multi-core fiber-fed integral field spectrograph (MCIFU)-III : An ultrafast laser inscribed photonic reformatter and mask. Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV. editor / Ramon Navarro ; Roland Geyl. U. S. A. : SPIE, 2020. (Proceedings of SPIE - The International Society for Optical Engineering).

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abstract = "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. ",

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AU - MacLachlan, David G.

AU - Ross, Calum A.

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AU - Haffert, Sebastiaan Y.

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AB - 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.

KW - Astrophotonics

KW - Exoplanets

KW - High contrast imaging.

KW - Integral field spectroscopy

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Multi-core fiber-fed integral field spectrograph (MCIFU)-III: An ultrafast laser inscribed photonic reformatter and mask

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