Patent ID: 6911160

Claim:
A phosphate glass composition comprising: from about 60 to 75 mole percent P 2 O 5 ; from about 8 to 30 mole percent of X 2 O 3 , wherein X is selected from the group consisting of aluminum, boron, lanthanum, scandium, yttrium, and combinations thereof; from about 0.5 to 25 mole percent R 2 O, wherein R is selected from the group consisting of lithium, sodium, potassium, and combinations thereof; at least one of MO, wherein M is selected from the group consisting of magnesium, calcium, strontium, barium, zinc and combinations thereof and is present in an amount of from 0.5 to 15 mole percent; at least one of a member selected from the group consisting of oxides of silicon, germanium, lead, tellurium and combinations thereof and is present in an amount of from 0.5 to 15 mole percent; and from 10 to 30 mole percent of one or more lasing ions selected from the group consisting of cerium, praseodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, copper, chromium, and combinations thereof.