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Related Experiment Video

Updated: May 5, 2026

Electrospray Deposition of Uniform Thickness Ge23Sb7S70 and As40S60 Chalcogenide Glass Films

Electrospray Deposition of Uniform Thickness Ge23Sb7S70 and As40S60 Chalcogenide Glass Films

Published on: August 19, 2016

Optical Design and Lens Fabrication for Automotive Thermal Imaging Using Chalcogenide Glass.

Young-Soo Choi¹, Ji-Kwan Kim¹

¹School of Mechanical and Automotive Engineering, Gwangju University, Gwangju 61743, Republic of Korea.

|August 28, 2025

Summary

This study presents a new design for athermalized infrared lenses using chalcogenide glass for vehicle thermal imaging. The fabrication process resulted in high-precision lenses with excellent thermal stability.

Keywords:

athermalization of optical system automotive thermal imaging cameras chalcogenide glass compression molding molded IR lens

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Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

Published on: April 11, 2025

Area of Science:

Optics and Photonics
Materials Science
Thermal Imaging Technology

Background:

Infrared lenses are critical for vehicle-mounted thermal imaging cameras.
Achieving athermalization is essential for stable performance across temperatures.
Germanium, a common lens material, has a high thermo-optic coefficient, posing challenges for athermalization.

Purpose of the Study:

To design and fabricate athermalized infrared lenses for vehicle applications.
To utilize chalcogenide glass (As40Se60) for improved thermal stability.
To develop a fabrication process yielding high-precision optical components.

Main Methods:

Adoption of chalcogenide glass (As40Se60) with a lower thermo-optic coefficient (dn/dT) than germanium.
Optical design ensuring opposing defocus directions with temperature changes.
Fabrication using a compression molding method with mold iteration.

Main Results:

Successfully designed and fabricated athermalized infrared lenses.
Achieved form error (PV) of less than 1.5 μm for molded lenses.
Demonstrated the optical design's viability through Modulation Transfer Function (MTF) and thermal imaging evaluations.

Conclusions:

The proposed optical design and fabrication process using chalcogenide glass is effective for athermalized infrared lenses.
The developed lenses are suitable for integration into vehicle-mounted thermal imaging systems.
The study confirms the potential of this approach for advanced thermal imaging applications.