摘要: Abstract Properties necessary to obtain efficient laser action from dyes are reviewed. It is concluded that the dye added (booster dye) a (active solution increase its efficiency need not necessarily be dye. This illustrated by considering different spectral locations of triplet-triplet absorption band present in booster relative location region (part fluorescence spectrum) active Conditions required for form mixtures given. These observations used explain why specific well known show efficient, little, or no at all.