  Celestially, Positronium (Ps), has only been observed through gamma-ray
emission produced by its annihilation. However, in its triplet state, a Ps atom
has a mean lifetime long enough for electronic transitions to occur between
quantum states. This produces a recombination spectrum observable in principle
at near IR wavelengths, where angular resolution greatly exceeding that of the
gamma-ray observations is possible. However, the background in the NIR is
dominated by extremely bright atmospheric hydroxyl (OH) emission lines. In this
paper we present the design of a diffraction-limited spectroscopic system using
novel photonic components - a photonic lantern, OH Fiber Bragg Grating filters,
and a photonic TIGER 2-dimensional pseudo-slit - to observe the Ps Balmer alpha
line at 1.3122 microns for the first time.
