Ho³⁺Doped 2.84μm Laser Glass for Laser Knives, Sensitized by Yb³⁺

抄録

The fluorescence properties of the Ho³⁺⁵I₆→⁵I₇ transition in Yb³⁺-Ho³⁺codoped aluminozircofluoride glasses were investigated. The emission wavelength of Ho³⁺ (⁵I₆→→⁵I₇) at 2.84 μm is almost the same as the vibration oscillation absorption of hydroxyl (OH^-1) at 2.89 μm. The emission intensity of Ho³⁺(⁵I₆→→⁵I₇) transition in Yb³⁺-Ho³⁺codopedaluminozirco-fluoride glass is 4.5 times higher than commercial 2.7μm Er³⁺laser glass. As thelifetime of ⁵I₇ level is longer than ⁵I₆ level, the Nd³⁺, Eu³⁺, Pr³⁺, Sm³⁺ and Tb³⁺ were investigatedas deactivator for decreasing the lifetime of ⁵I₇ level. Eu³⁺and Tb³⁺ are good candidates for deactivator because they have energy levels which are close to the Ho³⁺⁵I₇ level todecrease the population of Ho³⁺⁵I₇ level by energy transfer and have not energy levels whichare close to the Ho³⁺⁵I₆ level or Yb³⁺²F_5/2 level.