- f– and d-ions in crystalline and non-crystalline insulators and semiconductors, energy transfer
- electron-phonon interaction and dynamics
- relaxation of excited states and photoinduced phenomena
- microwave-optical and terahertz spectroscopy
- magnetic resonance spectroscopy
- magneto-optical spectroscopy
- cooperative processes and coherent phenomena
- electron structure modeling and spectra simulation
- microscopic theory of exchange and hyperfine coupling
- nonlinear spectroscopy
- probing of organic and biomaterials
- charge transfer phenomena and charge ordering
- solid-state lasers, scintillators, phosphors
- crystallography aspects of optical materials development
- spectroscopy of photonic crystals
- quantum information processing and instrumentation