Ge-As-Se-Te硫系玻璃的飞秒激光损伤特性

Femtosecond laser damage characteristics of Ge-As-Se-Te chalcogenide glass

Ge-As-Se-Te(GAST)硫族化物玻璃拥有超过20μm的超宽透射范围,是一种可应用于中红外(MIR)和远红外(FIR)波段的优良光学材料。通过熔融淬火法制备了Ge_(x)As_(40−x)Se_(40)Te_(20)(x=0、10、20、30、40 mol%)系列硫系玻璃,采用不同波长(800 nm,3μm和4μm)、功率和重复频率的飞秒激光辐照硫系玻璃,利用扫描电子显微镜(SEM)和拉曼光谱等手段研究了GAST的激光损伤特性。研究结果发现,Ge_(x)As_(40-x)Se_(40)Te_(20)玻璃的激光诱导损伤阈值(LIDT)随着样品中Ge含量的增加而增加,在800 nm下Ge_(30)As_(10)Se4_(0)Te_(20)玻璃的LIDT达到最高40.16 mJ/cm^(2)。随着飞秒激光波长增加,系列玻璃的LIDT也逐步增加,Ge_(30)As_(10)Se_(40)Te_(20)在4μm激光辐照下LIDT达到81.09 mJ/cm^(2)。此外,研究结果表明样品LIDT随着激光的脉冲辐照数量和重复率的增加将逐渐减小。

Ge-As-Se-Te(GAST)chalcogenide glass has ultra-wide transmission range of more than 20μm,an excellent optical material that can be applied in mid-infrared(MIR)and far-infrared(FIR).In this work,the Ge_(x)As_(40-x)Se_(40)Te_(20)(x=0,10,20,30,40 mol%)chalcogenide glasses were prepared by the fusion quenching method,and the optical properties were tested.The sample glass was irradiated with femtosecond lasers of different wavelengths(800 nm,3μm and 4μm),different powers and repetition frequencies,and the laser damage characteristics of GAST were studied by scanning electron microscopy(SEM)and Raman spectroscopy.With the increase of Ge content,the laser-induced damage threshold(LIDT)at 800 nm reaches a maximum of 40.16 mJ/cm^(2)at Ge_(30)As_(10)Se4_(0)Te_(20).The LIDT increase with wavelength of the femtosecond laser and reaches 81.09 mJ/cm^(2)at 4μm.In addition,the results show that LIDT will gradually decrease as the number of laser pulses and the repetition rate increase.