Ge-As-Se-Te硫系玻璃的飞秒激光损伤特性

Ge-As-Se-Te（GAST）硫族化物玻璃拥有超过20 μm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_xAs_40?xSe₄₀Te₂₀（x = 0、10、20、30、40 mol%）系列硫系玻璃，采用不同波长（800 nm，3 μm和4 μm）、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_xAs_40-xSe₄₀Te₂₀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Ge₃₀As₁₀Se₄₀Te₂₀玻璃的LIDT达到最高40.16 mJ/cm2。随着飞秒激光波长增加，系列玻璃的LIDT也逐步增加，Ge₃₀As₁₀Se₄₀Te₂₀在4 μm激光辐照下LIDT达到81.09 mJ/cm2。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。

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

Ge-As-Se-Te (GAST) chalcogenide glass has ultra-wide transmission range of more than 20 μm, an excellent optical material that can be applied in mid-infrared (MIR) and far-infrared (FIR). In this work, the Ge_xAs_40?xSe₄₀Te₂₀ (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, 3 μm and 4 μm), 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/cm2 at Ge₃₀As₁₀Se₄₀Te₂₀. The LIDT increase with wavelength of the femtosecond laser and reaches 81.09 mJ/cm2 at 4 μm. In addition, the results show that LIDT will gradually decrease as the number of laser pulses and the repetition rate increase.