Astrophotonic spectroscopy: defining the potential advantage

TL;DR

This paper evaluates the potential advantages of photonic spectrographs over traditional spectrographs, demonstrating their benefits through simulations and confirming their importance for future astronomical instrumentation, especially for Extremely Large Telescopes.

Contribution

It provides a theoretical overview and simulation-based verification of the advantages of integrated photonic spectrographs in astronomy, defining their potential benefits.

Findings

Photonic spectrographs can be significantly smaller than conventional ones with similar resolving power.

Simulations confirm the advantage of photonic devices for next-generation telescopes.

Photonic spectrographs are promising for future astronomical instrumentation development.

Abstract

A photonic spectrograph can be much smaller than a conventional spectrograph with the same resolving power. Individual devices can be integrated with optical fibres to improve the multiplex gain in astronomical spectroscopy. Although experimental devices have been tested, the parameter space where integrated photonic spectrographs give a significant advantage over traditional methods has not been defined. This paper gives an overview of the theory with verification by direct simulation using Fresnel propagation and quantifies the benefit for representative spectroscopic capabilities. We thereby confirm the advantage of photonic spectrographs, especially to the next generation of Extremely Large Telescopes, and therefore conclude that these devices may be important for the future development of astronomical instrumentation.