A transparent alumina film doped with laser dye and its emission properties

Abstract

Laser dye (Rhodamine 6G, Rhodamine B or Oxazine 4) was doped in a matrix of alumina gel glass by the sol-gel technique using aqueous sol solution. The undesirable dye aggregation usually observed in aqueous solution is largely reduced in the film, even at a concentration as high as 10 −2 M. When this film was irradiated with a N 2 laser, the film gave laser emission with a beam divergence of about 0.1 rad. The width of the dye laser emission is 10 nm which is typical of a dye laser. The calculated conversion efficiency is 2.1%. A decrease of power is linearly proportional to the shot number, which indicates a one-photon process.