Infrared lenses using a novel infrared transmitting glass

Y. Matsushita; F. Sato; N. Masuda

doi:10.1117/12.2597047

12 September 2021 Infrared lenses using a novel infrared transmitting glass

Y. Matsushita, F. Sato, N. Masuda

Proceedings Volume 11868, Emerging Imaging and Sensing Technologies for Security and Defence VI; 118680V (2021) https://doi.org/10.1117/12.2597047
Event: SPIE Security + Defence, 2021, Online Only

Abstract

New chalcogenide glass (FI-02) has been developed successfully, with its most effective feature being its infrared (IR) transmittance. FI-02 can transmit up to 20-μm wavelengths of IR light and has a very wide transmittance spectrum in the IR region as compared to the germanium single crystal and conventional chalcogenide glass. Its excellent transmission property is expected to improve the brightness and clarity of IR images. In addition, FI-02 has a high refractive index of 3.47 (at a wavelength of 10 μm). This is the highest refractive index among glass materials, thus enabling the fabrication of thin and high-performance IR lenses. Furthermore, unlike crystal materials, FI-02 can be processed through press molding. This enables to make high performance lens with high productivity. To investigate the performance of FI-02 as an IR lens material, we made two types of IR lens units: focal length (FL) 10.5 mm (standard type) and FL 2.04 mm (super wide-angle type). In the standard lens unit, IR images were captured with better contrast as compared to those captured using the germanium or conventional chalcogenide glass lenses. This could be attributed to the good IR transmission property of FI-02. In the super wide-angle type, IR images were captured that were wider and less distorted as compared to those of the typical wide-angle IR lens unit. This was attributed to the advantage of the high refractive index of FI-02 and its ability to form aspherical shapes through press molding.

Conference Presentation

Citation Download Citation

Y. Matsushita, F. Sato, and N. Masuda "Infrared lenses using a novel infrared transmitting glass", Proc. SPIE 11868, Emerging Imaging and Sensing Technologies for Security and Defence VI, 118680V (12 September 2021); https://doi.org/10.1117/12.2597047

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