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SLGE
Focal length f
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Edge thickness te
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The single crystal of germanium used in semiconductor is less absorption in the infrared wavelength of 2 - 20μm and it can be used as an optical element of the infrared light. It is a single lens which was made with the germanium crystal. It is used as a lens of a camera to observe the infrared, such as thermography.

◦Even though it looks like the light does not transmit because of its metallic luster, it is transmitting through a wide infrared range of 2 - 20μm.
◦The wavelength of 1.5μm or less does not transmit, so it also provides the effect of an infrared transmission filter.
◦Since the silicon lens has a refractive index of 4 or more, the lens curvature is slower then when made from standard glass.

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▶It is available with an AR coating to reduce the transmission loss by reflection at the requested wavelength.

Attention

▶Germanium lens can have metallic luster, so that visible light is reflected and absorbed. Because of this, no transmittance occurs.
▶Germanium lens without an anti-reflection coating has a loss due to surface reflection and results in transmittance of about 40%.
▶For the observation of infrared wavelengths, it is necessary to consider the effect of the radiation spectrum by temperature. In case of using in an environment of 30℃ or more, radiant light of infrared (near 9.6μm) is emitted from all substances, and it will not be able to properly observe this infrared spectrum.

Common Specifications
MaterialGermanium (Ge)
TypeOthers
Design Wavelength10.6μm
CoatingUncoated
Surface reflectance36% at 5μm
Shape TypePlano Convex spheric (Polished surface on both sides)
Eccentricity<3′
Clear aperture90% of the diameter
Surface Quality (Scratch-Dig)60-40
Outline Drawing

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Schematic

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Physics

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Typical Transmittance Data

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T: Transmission

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SLGE-25-25P

SLGE-25-50P

SLGE-25-100P

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    JP Yen Stock Qty
SLGE-25-25P
SLGE-25-50P
SLGE-25-100P

25mm

24.25mm

1.95mm

50mm

49.25mm

2.48mm

100mm

99.25mm

2.74mm

RoHS  

¥26,400

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RoHS  

¥26,400

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RoHS  

¥26,400

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US