SPECIFIC FEATURES OF LOCAL DATA ERASURE AND LASER COOLING IN VAN-VLECK PARAMAGNETICS

Nonequilibrium population of hyperfine sublevels of the ground electro nic state of rare-earth ions is theoretically investigated for Van Vle ck paramagnetic crystals subject to optical excitation with laser puls es. We discuss the possibility of using the predicted specific feature s of the phenomenon under study for the development of methods for the laser cooling of the nuclear spin system and methods of local data er asure in the regime of long-lived photon echo.