Abstract
The recent results of low temperature organic glass relaxation on broad temperature and time scales, investigated via optical hole burning spectroscopy, are reviewed. A short introduction to the persistent hole burning effect and the burning mechanisms is given. The manifestation of glass relaxation in optical spectra in form of spectral diffusion (SD) is interpreted in terms of the two level system (TLS) model. The main characteristics of equilibrium SD in organic glasses are investigated and quantitatively described by the TLS model. Nonequilibrium effects, caused by various reasons such as sample aging or external perturbations are discussed. The last section presents the new observations of SD on PMMA samples at relatively high temperature, which can not be explained in a framework of TLS model.
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