Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
A novel four light ray path test method for measuring residual reflectance has been presented. Residual reflectance spatial distribution at a cladding interface was measured using the technique. Residual reflectance could be on the order of 10?5 by matching the refractive index of Nd:glass, polymer, and cladding glass and eliminating defects in the adhesive layer. Residual reflection spatial distribution appears to be similar to Newton rings due to the edge surface flatness. The relationship between the residual reflectance and the edge surface flatness was discussed, and the results revealed that the edge surface flatness is very important during the cladding process.
residual reflectance edge cladding Nd:glass amplifier Chinese Optics Letters
2020, 18(9): 091402
1 中国科学院光电技术研究所，成都 610209
2 中国科学院研究生院，北京 100049
在大数值孔径深紫外光学系统中，需要使用宽入射角范围的增透膜光学元件。选择 LaF3和 MgF2两种镀膜材料，设计了适用于深紫外宽入射角范围的三层、五层和七层三种增透膜系。实验使用热舟蒸发在熔融石英基底上镀制了设计的薄膜，并用紫外分光光度计对其光谱性能进行了测试，得到了在宽入射角范围内具有较高透过率的深紫外增透膜元件。双面镀五层增透膜系的熔石英基片在 0°～55°入射角内的剩余反射率小于 2.5%，在 0°～20°入射角内的透过率大于 98%。
深紫外 增透膜 宽入射角范围 剩余反射率 deep ultraviolet antireflection coatings wide angle of incidence residual reflectance
根据电视／红外双色制导的要求，研制了锗酸盐基底上的双波段宽带减反膜。其膜系设计采用二氧化钛和二氧化硅分别作为高、低折射率膜料的13层膜堆，镀制的膜层满足环境稳定性标准。在0．56～0．75μm波长范围内，双面镀膜后的平均透过率大于98%，单面平均剩余反射率不超过0．5%；在3．6～4．8μm波长范围内，双面镀膜后的平均透过率至少可达到85%，单面平均剩余反射率不超过1．5%。
薄膜光学 减反膜 剩余反射 双波段 film optics antireflection coating residual reflectance dual-waveband
