  We report near and mid-infrared pump c-axis terahertz probe measurement on a
superconducting single crystal La$_{1.905}$Ba$_{0.095}$CuO$_4$ with T$_c$=32 K.
The measurement reveals that the pump-induced change occurs predominantly at
the Josephson plasma edge position below T$_c$. Upon excited by the strong
near-infrared pulses, the superconducting state is severely disturbed and
incoherent quasiparticle excitations develop in frequency regime above the
static plasma edge. However, within very short time delay ($\sim$1.5 ps) we
observe the reappearance of a very sharp Josephson plasma edge at frequency
lower than the static Josephson plasma edge and the emergence of a new
light-induced Josephson mode at higher energy. The results imply that the light
can induce new Josephson couplings with different coupling strengths. Similar
but weaker effect is observed for the mid-infrared pump. No pump induced effect
is detected above T$_c$.
