LaF<sub>3</sub>-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

Cheng Haijuan; Yu Xiaohui; Peng Lang; Pu Qunyan; Cai Yi; Li Maozhong; Yang Weisheng; Bai Yuzhuo; Zhao Jinsong; Wang Lingxue

doi:10.3788/IRLA201948.1117001

Evaporation characteristics and optical constants of LaF3 materials in 2.5-12 m infrared band were investigated. With low refractive index LaF3 materials, high-durability antireflection (AR) coatings in 3.7-4.8 m medium-wavelength infrared bands were designed and fabricated on Ge substrate. SEM image of the AR coatings with the LaF3 shows that the surface nanocrystals is uniform and densified. The measured optical properties by Fourier tranform infrared spectrometer indicate that the peak transmittance is as high as 99.4%, and the average transmittance increases to 98.8% from 47.7% in 3.7-4.8 m after double-sided coating. The firmness and durability environmental tests signify that this AR coating can work in harsh environment while maintaining good optical properties.

LaF₃-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

1. School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;

2. North Night-Vision Science& Technology Group Co.,Ltd,Kunming 650221,China

Received Date: 2019-09-11

Rev Recd Date: 2019-10-21

Publish Date: 2019-11-25

Key words:

Abstract: Evaporation characteristics and optical constants of LaF3 materials in 2.5-12 m infrared band were investigated. With low refractive index LaF3 materials, high-durability antireflection (AR) coatings in 3.7-4.8 m medium-wavelength infrared bands were designed and fabricated on Ge substrate. SEM image of the AR coatings with the LaF3 shows that the surface nanocrystals is uniform and densified. The measured optical properties by Fourier tranform infrared spectrometer indicate that the peak transmittance is as high as 99.4%, and the average transmittance increases to 98.8% from 47.7% in 3.7-4.8 m after double-sided coating. The firmness and durability environmental tests signify that this AR coating can work in harsh environment while maintaining good optical properties.

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LaF₃-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

doi: 10.3788/IRLA201948.1117001

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LaF₃-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

doi: 10.3788/IRLA201948.1117001

1. School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;

2. North Night-Vision Science& Technology Group Co.,Ltd,Kunming 650221,China

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LaF3-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

doi: 10.3788/IRLA201948.1117001

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views

LaF3-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

doi: 10.3788/IRLA201948.1117001

1. School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China; 2. North Night-Vision Science& Technology Group Co.,Ltd,Kunming 650221,China

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LaF₃-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

LaF₃-ZnS-Ge high-durability MWIR antireflective film on Ge substrate

1. School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;

2. North Night-Vision Science& Technology Group Co.,Ltd,Kunming 650221,China