Excitation-power-dependent spectral shift in photoluminescence in dye molecules in strongly scattering optical media

[摘要] Photoluminescence spectra and the reflectivity of incident light were examined in dye molecules in strongly scattering media. With increasing incident light intensity, the spectra show red- and blueshifts depending on the geometry of experiments, and the reflectivity increases nonlinearly. These excitation-power-dependent spectral shifts and nonlinear reflectivity are well explained when we consider saturation absorption in the excitation process and the reabsorption in the luminescence process in dyes. [S0163-1829(99)14701-5].

[关键词] LASER ACTION;GAIN MEDIA;COHERENT BACKSCATTERING;STIMULATED-EMISSION;WEAK LOCALIZATION;LIGHT