  One of the primary difficulties in the implementation of organic-dye-based
random lasers is the tendency of organic dyes to irreversibly photodecay. In
this letter we report the observation of "reversible" photodegradation in a
Rhodamine 6G and ZrO$_2$ nanoparticle doped polyurethane random laser. We find
that during degradation the emission broadens, redshifts, and decreases in
intensity. After degradation the system is observed to self-heal leading to the
emission returning to its pristine intensity, giving a recovery efficiency of
100%. While the peak intensity fully recovers, the process is not strictly
"reversible" as the emission after recovery is still found to be broadened and
redshifted. The combination of the peak emission fully recovering and the
broadening of the emission leads to a remarkable result: the random laser
cycled through degradation and recovery has a greater integrated emission
intensity than the pristine system.
