The present disclosure is directed to a doped silica-titania glass, DST glass, consisting essentially of 0.1 wt.% to 5 wt.% halogen, 50 ppm-wt. to 6 wt.% of one or more oxides of Al, Ta and Nb, 3 wt.% to 10 wt.% TiO 2 and the remainder SiO 2 . In an embodiment the halogen content can be in the range of 0.2 wt.% to 3 wt.% along with 50 ppm-wt. to 6 wt.% one or more oxides of Al, Ta and Nb, 3 wt.% to 10 wt.% TiO 2 and the remainder SiO 2 . In an embodiment the DST glass has an OH concentration of less than 100 ppm. In another embodiment the OH concentration is less than 50 ppm. The DST glass has a Active temperature T f of less than 875°C. In an embodiment T f is less than 825°C. In another embodiment T f is less than 775°C.