Kang Yan, Wang Jin, Zhao Yongkun, Zhao Xudong, Tao Haizheng, Xu Yinsheng
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
Research Center, Nanjing Wavelength Optoelectronic Technology Co., Ltd., Nanjing 211100, China.
Materials (Basel). 2023 Mar 23;16(7):2566. doi: 10.3390/ma16072566.
Infrared gradient refractive index (GRIN) material lenses have attracted much attention due to their continuously varying refractive index as a function of spatial coordinates in the medium. Herein, a glass accumulation thermal diffusion method was used to fabricate a high refractive index GRIN lens. Six GeAsSeTe ( = 10.5-16) glasses with good thermal stability and high refractive index ( > 3.1) were selected for thermal diffusion. The refractive index span (∆) of 0.12 was achieved in this GRIN lens. After thermal diffusion, the lens still had good transmittance (45%) in the range of 8-12 μm. Thermal imaging confirmed that this lens can be molded into the designed shape. The refractive index profile was indirectly characterized by the structure and composition changes. The structure and composition variation became linear with the increase in temperature from 260 °C to 270 °C for 12 h, indicating that the refractive index changed linearly along the axis. The GRIN lens with a high refractive index could find applications in infrared optical systems and infrared lenses for thermal imaging.
红外梯度折射率（GRIN）材料透镜因其折射率随介质中空间坐标连续变化而备受关注。在此，采用玻璃堆积热扩散法制备了高折射率GRIN透镜。选择了六种具有良好热稳定性和高折射率（>3.1）的GeAsSeTe（ = 10.5 - 16）玻璃进行热扩散。该GRIN透镜实现了0.12的折射率跨度（∆）。热扩散后，该透镜在8 - 12μm范围内仍具有良好的透过率（45%）。热成像证实该透镜可模制成设计形状。通过结构和成分变化间接表征了折射率分布。在260℃至270℃温度下保温12小时，结构和成分变化随温度升高呈线性，表明折射率沿轴呈线性变化。这种高折射率GRIN透镜可应用于红外光学系统和热成像用红外透镜。
