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Chalcogenide glass lens

Chalcogenide glass is a glass composed of sulfur, selenium, tellurium and other elements (arsenic, antimony, germanium, etc.) in addition to oxygen and polonium in the VIA group of elements in the periodic table or their own combination. It has the following good properties:

● Far infrared transmittance is more than 64%(wavelength 8μm ~ 12 μm), after coating the transmittance can reach more than 95%.

● Low Tg, Ts temperature, suitable for aspherical lens precision molding, conducive to reducing the production cost of batch lenses.

● Low refractive index temperature coefficient, is an excellent infrared non-thermal lens design material, can achieve no color difference, no thermal defocusing optical system.

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Detail

● Far infrared transmittance is more than 64%(wavelength 8μm ~ 12 μm), after coating the transmittance can reach more than 95%.

● Low Tg, Ts temperature, suitable for aspherical lens precision molding, conducive to reducing the production cost of batch lenses.

● Low refractive index temperature coefficient, is an excellent infrared non-thermal lens design material, can achieve no color difference, no thermal defocusing optical system.

（1）Mid infrared wave band materials - Product parameters

No.	Brand No.	υ₄	n₄	ρ（g/cm³）	Transmittance wavelength （μm)
1	IRG101	12.77	1.5964	3.20	0.3～5.0
2	IRG102	14.76	1.6226	3.10	0.3～5.0
3	IRG104	13.67	1.6056	3.40	0.3～5.0
4	IRG105	18.92	1.8541	5.62	0.4～5.0
5	IRG106	21.21	1.7333	4.28	0.4～6.0

Far infrared wave band materials - Product parameters

Chalcogenide glass lens or based on clients' requirements
1..Material	Chalcogenide glass
2.Dimensional tolerances	0/-0.05mm
3.Surface flatness	人/4@633nm，per 25.4mm diameter
3.Clear aperture	＞90%
4.Centration	1 arc minute
5.Surface quality	Infrared 40-20
6.Edge Chip	＜0.1mm
7.Bevel	Based on clients' requests
8.Coating	Apply Infrared AR coating or based on client requests