37 citations · 136 across the 28 of their papers we have counts for
31 papers
Stellar interferometry with a K-band integrated optics beam combiner instrument at the CHARA Array - I. First on-sky fringes for CHARIOT
Aline N. Dinkelaker, Kévin Barjot, Nic Scott +8
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 p…
All-Fiber Broadband Wavelength-Division Multiplexing using Heterogeneous Photonic Lanterns
Abani Shankar Nayak, Julius Goehring, Martin M. Roth +1
This work presents an all-fiber broadband wavelength-division multiplexing architecture using 1x7 heterogeneous photonic lanterns (PLs), specifically PL-(6+1) and PL-(4+3). By comb…
Commissioning the AIP's ultrafast laser Inscription facility: defining the parameter space for type-I waveguide fabrication
Rima Islam, Aline N. Dinkelaker, Abani Shankar Nayak +2
Astrophotonics offers a compact, stable alternative to bulk optics in traditional astronomical instrumentation, spanning high-precision spectroscopy to high-contrast interferometry…
Sensing ELT petal modes with a discrete beam combiner: an end-to-end theoretical model
Kalaga V. Madhav, Abani Shankar Nayak, Lucas Labadie +1
The European Southern Observatory's Extremely Large Telescope (ELT), the 39-m telescope under construction in Chile, forms its entrance pupil from 798 hexagonal segments that the s…
Photonic Integrated Circuits for the Habitable Worlds Observatory: Science Drivers, Material Platforms, Arrayed-Waveguide Spectrographs, and a Space-Qualification Roadmap
Kalaga Madhav
NASA's Habitable Worlds Observatory (HWO) will require ultraviolet, optical, and near-infrared instruments that are simultaneously compact, mechanically and thermally stable, high-…
Towards High-Throughput Visible Photonic Lanterns for the EMARCOT Project
Abani Shankar Nayak, Julius Goehring, Marina Centenera-Merino +14
Photonic EMARCOT is an innovative project involving Spanish, German and Australian research institutes that aims to integrate multiple Optical Tube Assemblies (OTAs) using photonic…
Multiparameter quantum bounds for entanglement-assisted aperture synthesis
Kalaga Madhav, Pieter Kok, Nic Scott
Entanglement-assisted optical interferometry promises diffraction-limited imaging over baselines where light cannot be physically combined, but existing theory treats only a single…
Demonstration of a multimode-to-multimode photonic lantern for astronomy
Marina Centenera-Merino, Andrew Ross-Adams, Christopher Betters +14
Photonic lanterns have been widely used in astronomy as low-loss multiplexing devices, typically coupling light from a multimode input into several single-mode outputs. In this wor…
Qualification pathways for Photonic Integrated Circuits in Astrophotonic Space Missions
Kalaga Madhav, Aashia Rahman, Máté Ádámkovics
Photonic integrated circuits (PICs) promise order-of-magnitude reductions in the size, weight and power (SWaP) of optical subsystems for astronomy, planetary and Earth-observation…
Validation and extension of the PAWS Zemax model as a first step in the development of a Compact Arrayed Waveguide Stacked Multi-Object Spectrograph (CAWSMOS)
Fabienne Mangelsdorff, Andreas Stoll, Lars Zimmermann +4
The linear size of a bulk optical astronomical spectrograph scales with the diameter of the primary mirror of the corresponding telescope. As modern telescopes continue to increase…
NAIR-APREXIS: Enabling photonics-based instruments for long-baseline interferometry and integral-field spectroscopy
L. Labadie, R. J. Harris, K. Madhav +14
The NAIR project -- Novel Astronomical Instrumentation based on photonic light Reformatting -- aims at advancing photonic technologies for infrared long-baseline interferometry and…
Comparative analysis of fiber Bragg grating filter losses inscribed by continuous wave UV and femtosecond-IR lasers for astrophotonics
Aashia Rahman, Ria G. Krämer, Abani Shankar Nayak +8
Fiber Bragg grating (FBG) filters have been demonstrated as promising components in astrophotonic instrumentation for near-infrared ground-based observations. Given the photon-star…
Information limits of photonic lantern wavefront sensing: a Fisher- and quantum-Fisher-information framework and its relation to Fourier-filtering sensitivity limits
Kalaga Madhav
The photonic lantern is an all-photonic wavefront sensor native to single-mode-fibre-fed instruments, but its performance is almost always quoted through a specific reconstruction…
Scaling laws for multi-object spectrographs: empirical relationships and the photonic advantage of CAWSMOS
Kalaga V. Madhav, Martin M. Roth
Conventional multi-object spectrographs (MOS) incur masses and costs that scale unfavourably with channel count~ and resolving power~. A dataset of eigh…
Towards a Comprehensive Understanding of Planetary Systems through Population-Level, Large-Scale Surveys
Francisco J. Pozuelos, Pedro J. Amado, Jesús Aceituno +13
Over the past three decades, exoplanet research has delivered an extensive census of planets spanning a wide range of masses, sizes, and orbital configurations. Despite this progre…
Temperature-compensating package for OH line filters for astronomy: II. manufacture, assembly, and performance study
Xijie Luo, Carlos E. Rodriguez Alvarez, Aashia Rahman +7
Multi-channel aperiodic fiber Bragg grating (FBG) based hydroxyl (OH) line filters have attracted significant interest in ground-based near-infrared (NIR) astronomical observations…
The Potsdam astroComb (POCO) Part I: Mode crossing effect in feedback resonators
Daniel Bodenmüller, Kalaga Madhav, Martin Roth
We investigate theoretically and experimentally the mode interaction in an integrated Silicon Nitride (Si3N4) microring resonator with interferometric coupling realized by a feedba…
Characterization of a C-RED One camera for astrophotonical applications
Stella Vješnica, Eloy Hernandez, Kalaga Madhav +1
To better understand the impact of the avalanche gain applied in the detector technology and apply this technology in our in-house astrophotonic projects, we have characterized a C…
Six-telescope integrated optics beam combiner fabricated using ultrafast laser inscription for J- and H-band astronomy
Aline N. Dinkelaker, Sebastian Smarzyk, Abani S. Nayak +6
We have built and characterized the first six-telescope discrete beam combiner (DBC) for stellar interferometry in the astronomical J-band. It is the DBC with the largest number of…
Astrophotonics: photonic integrated circuits for astronomical instrumentation
Martin M. Roth, Kalaga Madhav, Andreas Stoll +6
Photonic Integrated Circuits (PIC) are best known for their important role in the telecommunication sector, e.g. high speed communication devices in data centers. However, PIC also…
MARCOT Pathfinder at Calar Alto Progress Report
Martin M. Roth, Jesús Aceituno, José L. Ortiz +7
MARCOT Pathfinder is a precursor for MARCOT (Multi Array of Combined Telescopes) at Calar Alto Observatory (CAHA) in Spain. MARCOT is intended to provide CARMENES, currently fiber-…
Design, simulation and characterization of integrated photonic spectrographs for Astronomy II: Low-aberration Generation-II AWG devices with three stigmatic points
Andreas Stoll, Kalaga Madhav, Martin Roth
In the second part of our series on integrated photonic spectrographs for astronomy, we present theoretical and experimental results on the design, simulation and characterization…
Design, simulation and characterization of integrated photonic spectrographs for Astronomy I: Generation-I AWG devices based on canonical layouts
Andreas Stoll, Kalaga V. Madhav, Martin M. Roth
We present an experimental study on our first generation of custom-developed arrayed waveguide gratings (AWG) on silica platform for spectroscopic applications in near-infrared ast…
Optimal SMF packing in photonic lanterns: comparing theoretical topology to practical packing arrangements
John J. Davenport, Momen Diab, Kalaga Madhav +1
Photonic lanterns rely on a close packed arrangement of single mode fibers, which are tapered and fused into one multi-mode core. Topologically optimal circle packing arrangements…