Fiber-connectorized ultrafast-laser-inscribed K-band integrated optics beam combiner for the CHARA telescope array

Jacopo Siliprandi; David G. MacLachlan; Calum A. Ross; Tarun K. Sharma; Lucas Labadie; Kalaga Madhav; Abani S. Nayak; Aline N. Dinkelaker; Martin M. Roth; Nicholas J. Scott; Vincent Coudé du Foresto; Robert R. Thomson; Aurélien Benoit

doi:10.1364/AO.510293

Fiber-connectorized ultrafast-laser-inscribed K-band integrated optics beam combiner for the CHARA telescope array

Jacopo Siliprandi^*, David G. MacLachlan, Calum A. Ross, Tarun K. Sharma, Lucas Labadie, Kalaga Madhav, Abani S. Nayak, Aline N. Dinkelaker, Martin M. Roth, Nicholas J. Scott, Vincent Coudé du Foresto, Robert R. Thomson, Aurélien Benoit

^*Corresponding author for this work

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Abstract

A fiber-connectorized K-band integrated-optics two-telescope beam combiner was developed for long-baseline interferometry at the CHARA telescope array utilizing the ultrafast laser inscription (ULI) technique. Single-mode waveguide insertion losses were measured to be ∼1.1 dB over the 2–2.3 µm window. The development of asymmetric directional couplers enabled the construction of a beam combiner that includes a 50:50 coupler for interferometric combination and two ∼75 : 25 couplers for photometric calibration. The visibility of the bare beam combiner was measured at 87% and then at 82% after fiber-connectorization by optimizing the input polarization. These results indicate that ULI technique can fabricate efficient fiber-connectorized K-band beam combiners for astronomical purposes.

Original language	English
Pages (from-to)	159-166
Number of pages	8
Journal	Applied Optics
Volume	63
Issue number	1
Early online date	21 Dec 2023
DOIs	https://doi.org/10.1364/AO.510293
Publication status	Published - 1 Jan 2024

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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Siliprandi, J., MacLachlan, D. G., Ross, C. A., Sharma, T. K., Labadie, L., Madhav, K., Nayak, A. S., Dinkelaker, A. N., Roth, M. M., Scott, N. J., du Foresto, V. C., Thomson, R. R., & Benoit, A. (2024). Fiber-connectorized ultrafast-laser-inscribed K-band integrated optics beam combiner for the CHARA telescope array. Applied Optics, 63(1), 159-166. https://doi.org/10.1364/AO.510293

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abstract = "A fiber-connectorized K-band integrated-optics two-telescope beam combiner was developed for long-baseline interferometry at the CHARA telescope array utilizing the ultrafast laser inscription (ULI) technique. Single-mode waveguide insertion losses were measured to be ∼1.1 dB over the 2–2.3 µm window. The development of asymmetric directional couplers enabled the construction of a beam combiner that includes a 50:50 coupler for interferometric combination and two ∼75 : 25 couplers for photometric calibration. The visibility of the bare beam combiner was measured at 87% and then at 82% after fiber-connectorization by optimizing the input polarization. These results indicate that ULI technique can fabricate efficient fiber-connectorized K-band beam combiners for astronomical purposes.",

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AU - Labadie, Lucas

AU - Madhav, Kalaga

AU - Nayak, Abani S.

AU - Dinkelaker, Aline N.

AU - Roth, Martin M.

AU - Scott, Nicholas J.

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AU - Thomson, Robert R.

AU - Benoit, Aurélien

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AB - A fiber-connectorized K-band integrated-optics two-telescope beam combiner was developed for long-baseline interferometry at the CHARA telescope array utilizing the ultrafast laser inscription (ULI) technique. Single-mode waveguide insertion losses were measured to be ∼1.1 dB over the 2–2.3 µm window. The development of asymmetric directional couplers enabled the construction of a beam combiner that includes a 50:50 coupler for interferometric combination and two ∼75 : 25 couplers for photometric calibration. The visibility of the bare beam combiner was measured at 87% and then at 82% after fiber-connectorization by optimizing the input polarization. These results indicate that ULI technique can fabricate efficient fiber-connectorized K-band beam combiners for astronomical purposes.

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Fiber-connectorized ultrafast-laser-inscribed K-band integrated optics beam combiner for the CHARA telescope array

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