Astrophotonic spectroscopy: defining the potential advantage

Details Astrophotonic spectroscopy: defining the potential advantage Astrophotonic spectroscopy: defining the potential advantage

2009-10-22

arxiv.org/abs/0910.4361v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Revised version submitted to MNRAS

Scientific paper

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.

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