Department;
of;
Physics,;
Govt.;
Post;
Graduate;
College,;
Rudrapur;
263153;
(U;
S;
Nagar),;
India;
Department;
of;
Physics,;
J.;
N.;
V.;
University,;
Jodhpur-342001,;
India;
Department;
of;
Physics,;
Govt.;
Post;
Graduate;
College,;
Rudrapur;
263153;
(U;
S;
Nagar),;
India;
rare; earth; glasses; Judd-Ofelt; theory; absorption; spectroscopy; luminescence;