Phosphate glass useful in high energy lasers.

摘要

A low-or no-silica, low- or no-alkali phosphate glass useful as a laser amplifier in a multiple pass, high energy laser system having a high thermal conductivity, K90 DEG C > 0.85 W/mK, a low coefficient of thermal expansion, alpha 20 DEG -300 DEG C < 80 x 10<-><7>/ DEG C, low emission cross section, sigma < 2.5 x 10<-><2><0>cm<2>, and a high fluorescence lifetime, tau > 325 mu secs at 3 wt.% Nd doping, consisting essentially of (on an oxide composition basis): <TABLE> wherein Ln2O3 is the sum of lanthanide oxides; SIGMA R2O is < 5, R being Li, Na, K, Cs, and Rb; the sum of Al2O3 and MgO is < 24 unless SIGMA R2O is 0, then the sum of Al2O3 and MgO is < 42; and the ratio of MgO to B2O3 is 0.48-4.20.