KOALA, the Kilofibre Optimised Astronomical Lenslet Array, is a wide-field, high efficiency integral field unit being designed for use with the bench mounted AAOmega spectrograph on the AAT. KOALA will have 1000 fibres in a rectangular array with a selectable field of view of either 1390 or 430 sq. arcseconds with a spatial sampling of 1.25" or 0.7" respectively. To achieve this KOALA will use a telecentric double lenslet array with interchangeable fore-optics. The IFU will feed AAOmega via a

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... m fibre run. The efficiency of KOALA is expected to be ≈52% at 3700A and ≈ 66% at 6563Å with a throughput of > 52% over the entire wavelength range. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8446 84460V-2 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8446 84460V-3 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8446 84460V-4 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8446 84460V-5 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8446 84460V-6 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 02/03/2013 Terms of Use: http://spiedl.org/terms Figure 7. A drawing of the KOALA slit assembly, showing three slitlets of 25 fibres each. ACKNOWLEDGMENTS KOALA is funded by an ARC LIEF grant with further contributions