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Author

K. Madhav

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Open access Aug 2026

NAIR-APREXIS: enabling photonics-based instruments for long-baseline interferometry and integral-field spectroscopy

The NAIR project – Novel Astronomical Instrumentation based on photonic light Reformatting – aims at advancing photonic technologies for infrared long-baseline interferometry and precision spectroscopy. The rapid development of astrophotonics over the past decade has opened new pathways for astronomical instrumentation...

L. Labadie, R. J. Harris, K. Madhav et al. · 0 citations
Open access Aug 2026

All-fiber broadband wavelength-division multiplexing using heterogeneous photonic lanterns

This work presents an all-fiber broadband wavelength-division multiplexing architecture using 1×7 heterogeneous photonic lanterns (PLs), specifically PL−(6 + 1) and PL−(4 + 3). By combining mismatched single-mode cores, namely SM450 and SMF28, without rigid geometric constraints, these devices break system degeneracy a...

A. Nayak, Julius Goehring, M. Roth et al. · 0 citations
Aug 2026

First on-sky fringes in K-band of an ULI-manufactured integrated optics beam combiner at the CHARA observatory

Long-baseline interferometric observations in the Near Infrared reach angular resolutions on the order of milliarcseconds. With the long baselines of the CHARA array, science cases such as exozodiacal dust of early-type main sequence stars can be probed to study early-stage planet formation with percentage-precision vi...

K. Barjot, A. Dinkelaker, N. Scott et al. · 0 citations
Open access Sep 2026

Stellar interferometry with a K-band integrated optics beam combiner instrument at the CHARA Array - I. First on-sky fringes for CHARIOT

We present the instrument description and the first on-sky observations for the new CHara ARray Integrated Optics Testbench (CHARIOT) at the CHARA Array. CHARIOT is a 2-telescope proof-of-concept instrument that utilises a fibre-connectorised beam combiner fabricated by ultrafast laser-inscription in Infrasil quartz...

A. Dinkelaker, K. Barjot, N. Scott et al. · 0 citations

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