Publications by authors named "Abani Shankar Nayak"
Article Synopsis
- The study presents initial results from a four-telescope integrated optics discrete beam combiner (DBC) tested at the William Herschel Telescope, designed to improve astronomical observations.
- The DBC, created using ultrafast laser inscription on a single substrate, processes light from stars like Vega and Altair at the H-band (1.6 µm) while utilizing a deformable mirror for efficient light injection.
- The results indicated that the measured visibility amplitudes and closure phases were affected by a significant dispersion from expected values, primarily due to a low signal-to-noise ratio, marking an initial step toward validating DBC for long-baseline interferometry.
We show the results of simulation and experimental study of a 4-telescope zig-zag discrete beam combiner (DBC) for long-baseline stellar interferometry working at the astronomical L band (3 - 4 µm) under the influence of a narrow bandwidth light source. Following Saviauk et al. (2013), we used a quasi-monochromatic visibility-to-pixel matrix (V2PM) for retrieving the complex coherence functions from simulated and experimentally measured power at the output of the device.
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