Luminescence from Potassium Feldspars Stimulated by Infrared and Green Light

A series of experiments are reported which investigate stimulated luminescence from potassium feldspar. The aim is to provide a basic phenomenological description of the response of the material to stimulation by heat, infrared radiation (875 ? 80 nm) and a green light wavelength band from 515 to 560 nm. Two conclusions are drawn: firstly it is suggested that the majority of the trapped charge responsible for the infrared stimulated luminescence signal does not give rise to a thermoluminescence signal, and secondly that a large fraction of the two optically stimulated luminescence signals originate from common traps.