Experimental Observations of Trapping Levels in BSO

A. E. Attard, 
T. X Brown

Applied Optics, vol. 25, no. 18, pp. 3253-3259. 1986.

The photorefractive effect in BSO has been used to examine deep
trapping levels. Observations of the decay dynamics of laser-induced
phase gratings are consistent with the assumption of multiple shallow
and deep trapping levels. A close correlation between diffraction
intensities during write and read modes has been observed. The
possibility of multiple phase-shifted grating is suggested by these
results. Electron and hole trapping effects appear to be simultaneously
present with the hole traps exhibiting a long decay time constant