Abstract
We have observed persistent hole burning in frequency and wave-vector domains for multiple-scattered media consisting of Sm2+-doped glass powders. The hole burning occurs in the 4f6→4f55d transition of Sm2+, in contrast to the conventional photoionization hole burning in the 4f6→4f6 transition of Sm2+. The presence of holes in the wave-vector domain shows that this phenomenon is associated with the interference of multiple-scattered light in disordered media. The width of spectral holes dramatically sharpens by the decrease of optical absorption and the increase of optical scattering.
