Rare-earths (Pr, Ho) doped double tungstates NaY(WO4)(2) crystals were prep
ared by using Czochralski (CZ) pulling method. Their absorption spectra hav
e been measured in the region 300-2000nm at room temperature. A band gap of
eigentransition of 3.92eV was obtained. The three phenomenological paramet
ers were calculated through fitting of the calculated and measured oscillat
or strengths. J-O theory was used to evaluate the spontaneous emission prob
abilities, stimulated emission cross sections, branch ratios and energy lev
el lifetimes of some useful transitions of Ho3+ ions in NaY(WO,), crystals.
The obtained three phenomenological J-O intensity parameters Ohm (t) are O
hm (2)=2.17x10(-19), Ohm (4)=1.58x10(-19), Ohm (6)=3.24x10(-20) for Pr3+; O
hm (2)=1.64x10(-19), Ohm (4)=7.43x10(-20), Ohm (6)=1.60x10(-20) for Ho3+.