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