  A Photonic Lantern (PL) is a novel device that efficiently converts a
multi-mode fiber into several single-mode fibers. When coupled with an extreme
adaptive optics (ExAO) system and a spectrograph, PLs enable high throughput
spectroscopy at high angular resolution. The Subaru Coronagraphic Extreme
Adaptive Optics (SCExAO) system of the Subaru Telescope recently acquired a PL
that converts its multi-mode input into 19 single-mode outputs. The single mode
outputs feed a R~4,000 spectrograph optimized for the 600 to 760 nm wavelength
range. We present here the integration of the PL on SCExAO, and study the
device performance in terms of throughput, field of view, and spectral
reconstruction. We also present the first on-sky demonstration of a Visible PL
coupled with an ExAO system, showing a significant improvement of x12 in
throughput compared to the use of a sole single-mode fiber. This work paves the
way towards future high throughput photonics instrumentation at small angular
resolution.
