  Turbulence in quantum fluids has, surprisingly, a lot in common with its
classical counterpart. Recently, cold atomic gases has emerged as a well
controlled experimental platform to study turbulent dynamics. In this work, we
introduce a novel system to study quantum turbulence in optics, with the major
advantage of having access to a wide range of characterization tools available
for light fields. In particular we report the temporal dynamics of density and
phase and we show the emergence of isotropy in momentum space and the presence
of different scaling laws in the incompressible kinetic energy spectrum. The
microscopic origin of the algebraic exponents in the energy spectrum is
discussed by studying the internal structure of quantized vortices within the
healing length and their clustering at larger length scales. These results are
obtained using two counter-streaming fluids of light, which allows for a
precise preparation of the initial state and the in-situ measurement of the
compressible and incompressible fluid velocity.
