Patent ID: 8486850

Claim:
An aluminophosphate glass composition comprising (based on mol %): SiO 2 0.00-12.00 B 2 O 3 0.00-15.00 Al 2 O 3 6.00-11.00 P 2 O 5 55.00-67.00 Li 2 O 0.50-26.00 K 2 O 0.00-4.00 Na 2 O 0.00-4.00 Rb 2 O 0.00-4.00 Cs 2 O 0.00-4.00 MgO 0.00-5.00 ZnO 0.00-5.00 TiO 2 0.00-6.00 La 2 O 3 0.00-10.00 Nd 2 O 3 0.00-6.00 R 2 O (R = Li, Na, K, Rb, Cs) 8.0-26.00 MO (M = Mg, Ca, Sr, Ba, Zn) 0.0-5.0 wherein (a) Ln 2 O 3 (Ln=Nd, Yb, or other lasing rare earth ions) is >0.00-10.00 mol %; (b) the sum of SiO 2 , B 2 O 3 , and Al 2 O 3 is 6.0-28.0 mol %; (c) when R 2 O is ≧16.0 mol %, then Al 2 O 3 is 6.0-10.0 mol % and the sum of SiO 2 , B 2 O 3 , and Al 2 O 3 is 6.0-15.0 mol %; and (d) said glass contains SiO 2 and B 2 O 3 .