Phosphate glass combines an extended life time of Er3+ upper laser stage with economical energy transfer among Yb3+ and Er3+ ions and diminished upconversion losses, So providing effective operation in passively Q-switched diode-pumped and flash-lump pumped lasers Utilized in range-finders.language �?中国 韩国 韩国 韩国 韩国 韩国 W