Frozen core effects on nonexponential photon echo decay in ruby at high fields

Level-crossing effects and spin-dependent decay of circularly polarized photon echoes in ruby

Magnetic field- and concentration-dependent photon echo relaxation in ruby with simple exponential decay

Modulation and fast decay of photon-echos in ruby

Nonexponential superhyperfine-limited photon-echo decays

Photon echo decay in ruby: Electric dipole interactions and instantaneous diffusion

Reversed photon echo study of relaxation processes in ruby in a zero magnetic field