Laser damage threshold of telluride transmitting infrared fluoroaluminate glass

在氟铝酸盐玻璃组分中加入适量声子能量低的重金属氧化物TeO2，得到一种新的氧氟化物玻璃。该材料具有良好的成玻璃性能，适合制作大尺寸红外窗口镜。研究了TeO2含量对玻璃特征温度、阿贝数和红外透过性能的影响。同时测试了这种玻璃的抗DF激光能力，结果表明：TeO2含量为15％的玻璃，DF激光破坏阈值达14．95kW·cm^-2。分析显示，由于玻璃基质的多声子吸收，对激光能量的吸收而引起的热冲击是导致玻璃破坏的主要原因。进一步降低玻璃中水分，可以提高玻璃抗激光破坏性能。After introducing the low-phonon energy oxide——TeO₂ into the fluoroaluminate glass,a new oxyfluoride glass was obtained with better vitrification ability.Some physical properties were measured of the new glass with different TeO₂ content(such as characteristic temperature,Abbe value,infrared light transmittance,damage threshold for DF laser).The telluride fluoroaluminate with TeO₂ content 15% had a maximum damage threshold up to 14.95 kW·cm^-2.Analysis indicates that the main reason of the glass damage is thermal impact,which results from the absorbed laser energy for glass matrix and hydroxyl vibration.If the water content in the glass can be reduced,it will improve the property of the glass