K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription

Fraser A. Pike; Tarun K. Sharma; Aurélien Benoît; David G. MacLachlan; Aline N. Dinkelaker; Abani S. Nayak; Kalaga Madhav; Martin M. Roth; Lucas Labadie; Ettore Pedretti; Theo A. ten Brummelaar; Nicholas J. Scott; Vincent Coudé Du Foresto; Robert R. Thomson

doi:10.1117/12.2561663

K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription

Fraser A. Pike^*, Tarun K. Sharma, Aurélien Benoît, David G. MacLachlan, Aline N. Dinkelaker, Abani S. Nayak, Kalaga Madhav, Martin M. Roth, Lucas Labadie, Ettore Pedretti, Theo A. ten Brummelaar, Nicholas J. Scott, Vincent Coudé Du Foresto, Robert R. Thomson

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

130 Downloads (Pure)

Abstract

We report the ultrafast laser inscription (ULI) and characterization of 3 dB directional achromatic couplers for K-band between 2 and 2.4 μm. The couplers were fabricated in commercial Infrasil glass using 1030 nm femtosecond laser pulses. Straight waveguides inscribed using optimal fabrication parameters exhibit an average propagation loss of ~1.21 dB over full range of K-band with a single-mode behavior for a length of 17 mm. Directional couplers with different interaction lengths and waveguide widths were fabricated and characterized. We demonstrate that 3 dB achromatic directional couplers for K-band can be fabricated using ULI. These results show that ULI can fabricate highquality couplers for future applications in astronomical interferometry. Our eventual aim is to develop a two-telescope K-band integrated optical beam combiner to replace JouFLU at CHARA.

Original language	English
Title of host publication	Optical and Infrared Interferometry and Imaging VII
Editors	Peter G. Tuthill, Antoine Merand, Stephanie Sallum
Publisher	SPIE
ISBN (Electronic)	9781510636804
ISBN (Print)	9781510636798
DOIs	https://doi.org/10.1117/12.2561663
Publication status	Published - 13 Dec 2020
Event	SPIE Astronomical Telescopes + Instrumentation 2020 - Virtual, Online, United States Duration: 14 Dec 2020 → 22 Dec 2020

Publication series

Name	Proceedings of SPIE
Volume	11446
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	SPIE Astronomical Telescopes + Instrumentation 2020
Country/Territory	United States
City	Virtual, Online
Period	14/12/20 → 22/12/20

Keywords

Astrophotonics
Beam combiner
CHARA
Integrated optics
Long-baseline interferometry
Ultrafast laser inscription

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2561663

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Copyright 2020 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited. Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114460K (2020) https://doi.org/10.1117/12.2561663
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Pike, F. A., Sharma, T. K., Benoît, A., MacLachlan, D. G., Dinkelaker, A. N., Nayak, A. S., Madhav, K., Roth, M. M., Labadie, L., Pedretti, E., ten Brummelaar, T. A., Scott, N. J., Coudé Du Foresto, V., & Thomson, R. R. (2020). K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription. In P. G. Tuthill, A. Merand, & S. Sallum (Eds.), Optical and Infrared Interferometry and Imaging VII Article 114460K (Proceedings of SPIE; Vol. 11446). SPIE. https://doi.org/10.1117/12.2561663

@inproceedings{e175ba9fd4984628be263dc417c03a74,

title = "K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription",

abstract = "We report the ultrafast laser inscription (ULI) and characterization of 3 dB directional achromatic couplers for K-band between 2 and 2.4 μm. The couplers were fabricated in commercial Infrasil glass using 1030 nm femtosecond laser pulses. Straight waveguides inscribed using optimal fabrication parameters exhibit an average propagation loss of \textasciitilde{}1.21 dB over full range of K-band with a single-mode behavior for a length of 17 mm. Directional couplers with different interaction lengths and waveguide widths were fabricated and characterized. We demonstrate that 3 dB achromatic directional couplers for K-band can be fabricated using ULI. These results show that ULI can fabricate highquality couplers for future applications in astronomical interferometry. Our eventual aim is to develop a two-telescope K-band integrated optical beam combiner to replace JouFLU at CHARA.",

keywords = "Astrophotonics, Beam combiner, CHARA, Integrated optics, Long-baseline interferometry, Ultrafast laser inscription",

author = "Pike, \{Fraser A.\} and Sharma, \{Tarun K.\} and Aur{\'e}lien Beno{\^i}t and MacLachlan, \{David G.\} and Dinkelaker, \{Aline N.\} and Nayak, \{Abani S.\} and Kalaga Madhav and Roth, \{Martin M.\} and Lucas Labadie and Ettore Pedretti and \{ten Brummelaar\}, \{Theo A.\} and Scott, \{Nicholas J.\} and \{Coud{\'e} Du Foresto\}, Vincent and Thomson, \{Robert R.\}",

note = "Funding Information: This work was funded by the UK Science and Technology Facilities Council (STFC) – STFC grant no. ST/N000625/1, and by the European Union{\textquoteright}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. Publisher Copyright: {\textcopyright} 2020 SPIE. All rights reserved.; SPIE Astronomical Telescopes + Instrumentation 2020 ; Conference date: 14-12-2020 Through 22-12-2020",

year = "2020",

month = dec,

day = "13",

doi = "10.1117/12.2561663",

language = "English",

isbn = "9781510636798",

series = "Proceedings of SPIE",

publisher = "SPIE",

editor = "Tuthill, \{Peter G.\} and Antoine Merand and Stephanie Sallum",

booktitle = "Optical and Infrared Interferometry and Imaging VII",

address = "United States",

}

Pike, FA, Sharma, TK, Benoît, A , MacLachlan, DG, Dinkelaker, AN, Nayak, AS, Madhav, K, Roth, MM, Labadie, L, Pedretti, E, ten Brummelaar, TA, Scott, NJ, Coudé Du Foresto, V & Thomson, RR 2020, K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription. in PG Tuthill, A Merand & S Sallum (eds), Optical and Infrared Interferometry and Imaging VII., 114460K, Proceedings of SPIE, vol. 11446, SPIE, SPIE Astronomical Telescopes + Instrumentation 2020, Virtual, Online, United States, 14/12/20. https://doi.org/10.1117/12.2561663

K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription. / Pike, Fraser A.; Sharma, Tarun K.; Benoît, Aurélien et al.
Optical and Infrared Interferometry and Imaging VII. ed. / Peter G. Tuthill; Antoine Merand; Stephanie Sallum. SPIE, 2020. 114460K (Proceedings of SPIE; Vol. 11446).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription

AU - Pike, Fraser A.

AU - Sharma, Tarun K.

AU - Benoît, Aurélien

AU - MacLachlan, David G.

AU - Dinkelaker, Aline N.

AU - Nayak, Abani S.

AU - Madhav, Kalaga

AU - Roth, Martin M.

AU - Labadie, Lucas

AU - Pedretti, Ettore

AU - ten Brummelaar, Theo A.

AU - Scott, Nicholas J.

AU - Coudé Du Foresto, Vincent

AU - Thomson, Robert R.

N1 - Funding Information: 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. Publisher Copyright: © 2020 SPIE. All rights reserved.

PY - 2020/12/13

Y1 - 2020/12/13

N2 - We report the ultrafast laser inscription (ULI) and characterization of 3 dB directional achromatic couplers for K-band between 2 and 2.4 μm. The couplers were fabricated in commercial Infrasil glass using 1030 nm femtosecond laser pulses. Straight waveguides inscribed using optimal fabrication parameters exhibit an average propagation loss of ~1.21 dB over full range of K-band with a single-mode behavior for a length of 17 mm. Directional couplers with different interaction lengths and waveguide widths were fabricated and characterized. We demonstrate that 3 dB achromatic directional couplers for K-band can be fabricated using ULI. These results show that ULI can fabricate highquality couplers for future applications in astronomical interferometry. Our eventual aim is to develop a two-telescope K-band integrated optical beam combiner to replace JouFLU at CHARA.

AB - We report the ultrafast laser inscription (ULI) and characterization of 3 dB directional achromatic couplers for K-band between 2 and 2.4 μm. The couplers were fabricated in commercial Infrasil glass using 1030 nm femtosecond laser pulses. Straight waveguides inscribed using optimal fabrication parameters exhibit an average propagation loss of ~1.21 dB over full range of K-band with a single-mode behavior for a length of 17 mm. Directional couplers with different interaction lengths and waveguide widths were fabricated and characterized. We demonstrate that 3 dB achromatic directional couplers for K-band can be fabricated using ULI. These results show that ULI can fabricate highquality couplers for future applications in astronomical interferometry. Our eventual aim is to develop a two-telescope K-band integrated optical beam combiner to replace JouFLU at CHARA.

KW - Astrophotonics

KW - Beam combiner

KW - CHARA

KW - Integrated optics

KW - Long-baseline interferometry

KW - Ultrafast laser inscription

UR - https://www.scopus.com/pages/publications/85099179110

U2 - 10.1117/12.2561663

DO - 10.1117/12.2561663

M3 - Conference contribution

AN - SCOPUS:85099179110

SN - 9781510636798

T3 - Proceedings of SPIE

BT - Optical and Infrared Interferometry and Imaging VII

A2 - Tuthill, Peter G.

A2 - Merand, Antoine

A2 - Sallum, Stephanie

PB - SPIE

T2 - SPIE Astronomical Telescopes + Instrumentation 2020

Y2 - 14 December 2020 through 22 December 2020

ER -

K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription

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