Photon-avalanche upconversion in thulium-doped lutetium aluminum garnet.
Strong blue fluorescence at 487 nm corresponding to the (1)G(4) --> (3)H(6) transition was generated from Tm(3+)-doped lutetium aluminum garnet on excitation with a 618-nm dye laser as a result of a photon-avalanche upconversion mechanism.
Patel
D N
DN
Department of Physics, Alabama A&M University, PO Box 1268, Normal, Alabama 35762, USA.
Reddy
B R
BR
Nash-Stevenson
S K
SK