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We present a novel photolithography based technique to efficiently fabricatemicrolens-fibre based Integral Field Units (IFUs). These IFUs are beingdeveloped for Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS)which offer sixteen deployable IFUs. In each IFU, a 12 x 12 microlens array ismatched with a similar array of fibres to better than +/- 5 micron accuracy foreach microlens-fibre pair in the array. A mask created on copper foils usingphotolithography, transfer the pupil spot pattern of each microlens array to afibre array holder. The approach can be used for mass production of IFUs in anextremely efficient and cost-effective manner.

A new photolithography based technique to mass produce microlens+fibre based integralfield units (IFUs) for 2D spectroscopy