Fitting of optical constants of infrared coating materials and application in broadband antireflection coatings

Document Type

Article

Publication Date

3-1-2008

Abstract

The middle and long wave infrared optical constants of evaporated films, such as germanium, zinc sulphide, low absorption rare earth fluoride, etc, were obtained by fitting the transmission spectrum based on classical Lorenz oscillator model. Broad band antireflective coating from 7.7 μm to 15 μm had been designed and fabricated using these three materials. The measured transmission in the long wave region (13-15 μm) had been improved greatly by refining the design and using the low absorption materials. The measured transmission at 15 μm is 89.9%.

Publication Source (Journal or Book title)

Guangzi Xuebao/Acta Photonica Sinica

First Page

490

Last Page

493

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