TY - JOUR
T1 - Developing arrayed waveguide grating spectrographs for multi-object astronomical spectroscopy
AU - Cvetojevic, Nick
AU - Jovanovic, Nemanja
AU - Lawrence, Jon
AU - Withford, Michael
AU - Bland-Hawthorn, Joss
N1 - This paper was published in [Optics Express] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-3-2062]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
PY - 2012/1/30
Y1 - 2012/1/30
N2 - With the aim of utilizing arrayed waveguide gratings for multiobject spectroscopy in the field of astronomy, we outline several ways in which standard telecommunications grade chips should be modified. In particular, by removing the parabolic-horn taper or multimode interference coupler, and injecting with an optical fiber directly, the resolving power was increased threefold from 2400 ± 200 (spectral resolution of 0.63 ± 0.2 nm) to 7000 ± 700 (0.22 ± 0.02 nm) while attaining a throughput of 77 ± 5%. More importantly, the removal of the taper enabled simultaneous off-axis injection from multiple fibers, significantly increasing the number of spectra that can be obtained at once (i.e. the observing efficiency). Here we report that ∼12 fibers can be injected simultaneously within the free spectral range of our device, with a 20% reduction in resolving power for fibers placed at 0.8 mm off-centre.
AB - With the aim of utilizing arrayed waveguide gratings for multiobject spectroscopy in the field of astronomy, we outline several ways in which standard telecommunications grade chips should be modified. In particular, by removing the parabolic-horn taper or multimode interference coupler, and injecting with an optical fiber directly, the resolving power was increased threefold from 2400 ± 200 (spectral resolution of 0.63 ± 0.2 nm) to 7000 ± 700 (0.22 ± 0.02 nm) while attaining a throughput of 77 ± 5%. More importantly, the removal of the taper enabled simultaneous off-axis injection from multiple fibers, significantly increasing the number of spectra that can be obtained at once (i.e. the observing efficiency). Here we report that ∼12 fibers can be injected simultaneously within the free spectral range of our device, with a 20% reduction in resolving power for fibers placed at 0.8 mm off-centre.
UR - http://www.scopus.com/inward/record.url?scp=84856425737&partnerID=8YFLogxK
U2 - 10.1364/OE.20.002062
DO - 10.1364/OE.20.002062
M3 - Article
C2 - 22330447
AN - SCOPUS:84856425737
SN - 1094-4087
VL - 20
SP - 2062
EP - 2072
JO - Optics Express
JF - Optics Express
IS - 3
ER -