MIRRORLESS LASER ACTION FROM OPTICALLY PUMPED DYE-TREATED ANIMAL-TISSUES

Significant narrowing of the spectral and temporal profiles of emissio n radiation was observed from optically pumped chicken tissue and pig fat samples treated with rhodamine 640 dye solution. This narrowing of the emission response is attributed to mirrorless laser action from m ultiple scattering of radiation from within the excited dye regions of the animal tissue. These studies yield insight into the mechanisms of nonlinear optical interaction with continuously disordered heterogene ous active scattering structures of various sizes such as in animal ti ssues.