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Integrated photonic micro-spectrograph
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Title: First starlight spectrum captured using an integrated photonic micro-spectrograph
Authors: N. Cvetojevic, N. Jovanovic, C. Betters, J. S. Lawrence, S. C. Ellis, G. Robertson, J. Bland-Hawthorn

Photonic technologies have received growing consideration for incorporation into next-generation astronomical instrumentation, owing to their miniature footprint and inherent robustness. In this paper we present results from the first on-telescope demonstration of a miniature photonic spectrograph for astronomy, by obtaining spectra spanning the entire H-band from several stellar targets. The prototype was tested on the 3.9 m Anglo-Australian telescope. In particular, we present a spectrum of the variable star Pi 01 Gru, with observed CO molecular absorption bands, at a resolving power R = 2500 at 1600 nm. Furthermore, we successfully demonstrate the simultaneous acquisition of multiple spectra with a single spectrograph chip by using multiple fibre inputs.

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Photonic devices
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Future telescopes, with mirrors half the size of a football field, will need special components to deal with the light they collect. Astronomers are turning to photonic devices that guide and manipulate light inside specially-designed materials. The greatest potential, which is described in the latest issue of Optics Express, the Optical Society's (OSA) open-access journal, may lie in a laser-based technique that carves out micron-sized light pathways in three dimensions.
Astrophotonics lies at the interface of astronomy and photonics, the optical equivalent of electronics. Photonics has already been validated in astronomy, providing access to some of today's significant astrophysics observations. The field has experienced 10 years of breakthroughs in photonics instrumentation to enable the extent of today's interferometry and measurements. Fingernail-sized chips have been manufactured to manage the beams coming from up to three telescopes of existing interferometric arrays and are being considered for up to a six telescope beam combination in the coming years.

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L

Posts: 131433
Date:
Astrophotonics
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The emerging field of astrophotonics shows promise in analysing light from the night sky. Future telescopes, with mirrors half the size of a football field, will need special components to deal with the light they collect. Astronomers are turning to photonic devices that guide and manipulate light inside specially-designed materials. The greatest potential may lie in a laser-based technique that carves out micron-sized light pathways in three dimensions.

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