Reactor Pumped Laser is a special nuclear installation for direct conversion of nuclear energy into a laser irradiation. The installation consists of ignition reactor and laser module assembled from laser active elements. The reactor pumped laser functions as follows. Neutrons from the ignition reactor passing through the laser module are moderated and induce a chain fission reaction of uranium-235 in the coating of laser active elements. The fission fragments captured in special lasing mixture induce plasmas so that the inversion population of levels corresponds to the laser transition with appropriate wavelength. The energy stored in the inversion population is extracted from laser module by the optical system as a laser beam.