Lasing in low-dimensional ZnO objects: Interrelation between the crystallite morphology and feedback formation mechanisms

Specific features of UV lasing in low-dimensional zinc oxide materials have been investigated. Two main types of lasers, differing in the feedback formation mechanism-classical random lasers and microlasers—have been selected in active disordered zinc oxide materials. In the first case, feedback is provided by strong light backscattering, and a large number of scattering particles are involved in the cavity formation. In the second case, each crystallite operates as an individual microlaser. The main lasing spectral parameters are reported for the distinguished types of lasers.