FREQUENCY UP-CONVERSION IN ND3-DOPED FLUOROINDATE GLASS()

We report the observation of frequency upconversion in fluoroindate gl asses with the following compositions: (mol%) (39 - (2)-20SrF(2)-16BaF (2)-2GdF(3)-2Naf-1GaF(3)-xNdF(3) (x = 0.05, 0.1, 0.5, 1, 2, 3). The ex citation source was a dye laser in resonance with the I-4(9/2) --> ((2 )G(5/2), (2)G(7/2)) transition of the Nd3+ ions. The upconverted fluor escence spectra shows emissions from similar to 350 to similar to 450 nm, corresponding to transitions D-4(3/2) --> I-4(9/2); D-4(3/2) --> I -4(11/2); P-2(3/2) --> I-4(9/2); D-4(3/2) --> I-4(13/2); P-2(3/2) --> I-4(11/2); D-4(3/2) --> I-4(15/2); and P-2(13/2) --> I-4(13/2). The de pendence of the fluorescence signals on the laser intensity indicates that two laser photons participate in the process. The temporal behavi or of the signal indicates that energy transfer among the Nd3+ ions is the main mechanism which contributes to upconversion at 354 and 382 n m.