OBSERVATION OF TWO TYPES OF SPECTRAL HOLES IN MGO-DOPED Y2O3-PR3+ CRYSTALS

摘要

In addition to a narrow spectral hole due to optical pumping to hyperfine sublevels in the ground state, an anomalously broad persistent spectral hole was burned in Y2O3:Pr3+ crystals which contain a small amount of MgO. This broad hole was stable against 300 K-annealing. Burning of this broad hole is ascribed to the rearrangement of local structure around optical centers. [References: 9]