In experiments with pulsed nuclear reactors, the laser cell and the measurement devices are in the zone of intensive radiation. This imposes a constraint on the choice of structural and optical materials and photodetectors, and also makes it necessary to take special steps to test the functionality of individual unit assemblies at the time they are affected by reactor radiation, and afterwards. It is precisely the inadequate radiation resistance that is the basic reason for the absence of lasing when solid and liquid lasers were pumped by nuclear radiation (see Chap. 11, Sect. 11.1).

All materials and devices used in experiments with NPLs must satisfy the requirements of radiation resistance. Special attention must be paid to the cavity mirrors and windows for output of laser radiation, which in contrast to photodetectors and other measurement devices, cannot be removed from the zone of intensive irradiation. Owing to this, in parallel with the studies of the NPLs themselves, the radiation resistance of their elements and auxiliary devices were also studied [18,40].