Single-crystal germanium lenses for mid-wave and long-wave infrared optical systems operating from 2um to 14um. High refractive index (n=4.0) enables compact, fast f-number designs ideal for thermal imaging, FLIR systems, and IR spectroscopy.
Germanium
Standard / Custom
When specifying this product, these parameters most directly impact performance and cost:
Parameter Reference Guide
Typical Standard capability — available as shown
Available Alternative options exist — request quotation
Custom Per your drawing — quote after review
Subject to Review Depends on project specifics
Available specifications vary by material and configuration. Contact engineering for exact capabilities.
Germanium infrared lenses are fabricated from single-crystal germanium (Ge) for mid-wave and long-wave infrared applications. With a refractive index near 4.0, germanium enables compact, high-power lens designs for thermal imaging systems.
Use germanium lenses for thermal imaging (MWIR/LWIR), FTIR spectroscopy, and IR imaging systems operating from 2µm to 14µm. The high refractive index allows shorter focal lengths and more compact optical assemblies.
| Material | Availability | Spec Sheet |
|---|---|---|
| Germanium | Standard / Custom | See material page |
All materials are available in standard and custom thicknesses. Browse all 30+ optical materials
Single-layer or multi-layer AR coatings for specific wavelength bands. Reduce reflection to below 0.5% per surface.
Dielectric HR coatings for laser mirrors and cavity optics. Reflectivity >99.5% at design wavelength.
BBAR coatings for wide spectral range applications. Low reflection across 400-700nm or other bands.
Optimized for specific laser wavelengths: 266nm, 355nm, 532nm, 1064nm, 10.6µm, etc.
Custom coating designs for unique wavelength ranges, angles of incidence, and polarization requirements.
Material and coating selection must be matched to your operating wavelength band. We can help optimize for single-wavelength or broadband use.
Surface quality, flatness, and centration tolerances directly impact cost. Our engineers can help balance performance requirements with manufacturability.
High-power or wide temperature range applications require careful material selection to minimize thermal lensing and wavefront distortion.
For harsh environments, consider material chemical resistance, coating durability, and packaging options. We can provide MIL-spec testing on request.
Every component undergoes comprehensive inspection before shipment. Our quality control process includes:
Learn more about our quality processes
| Document | Purpose |
|---|---|
| Inspection Report | Confirms optical and mechanical specifications |
| Material Certificate | Confirms substrate material and grade |
| Coating Report | Confirms coating performance and wavelength range |
| Certificate of Conformity | Confirms conformity to agreed requirements |
| Dimensional Report | Confirms mechanical dimensions and tolerances |
Documentation provided according to agreed project requirements.
When requesting a quote for optical lenses, providing the following information helps us give you an accurate quotation:
Documentation available upon request. Custom specifications require engineering review.
To help us provide an accurate quotation, please prepare the following information. Not all fields are required — send what you have, and our engineering team can help identify missing parameters.
Not sure about some specifications? Send what you have — our engineering team will help identify the missing parameters and recommend appropriate values for your application.
Germanium Infrared Lenses are used in optical systems where precise control of light is required. Common applications include laser systems, imaging, spectroscopy, and scientific instrumentation.
The usable wavelength range depends on the selected material and coating. Please refer to the material specifications above or contact our engineering team for guidance.
Yes. PhotonEdge offers custom diameters, focal lengths, and coating specifications outside our standard catalog. Custom optics require engineering evaluation. Lead time is confirmed with your quotation.
We offer a range of standard and custom coatings including AR, HR, broadband, and laser-line options. Coating selection depends on your wavelength range and application requirements.
Our manufacturing partners operate under quality management processes aligned with ISO 9001 standards. All components undergo rigorous inspection including dimensional verification, surface quality assessment, and coating performance testing.
Yes. Inspection documentation including dimensional reports, surface quality verification, and coating performance data can be provided according to project requirements.
Custom optics require engineering evaluation. Lead time is confirmed with your quotation.
Click the 'Request a Quote' button above. Please provide your required specifications, wavelength, coating, surface quality, and quantity for an accurate quotation.
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Specification Parameters
Typical Specifications shown on this page are standard capabilities. Available Options include alternative materials and coatings. Custom Specifications are available per your drawing. Requirements beyond standard capability are marked Subject to Engineering Review.
Upload your drawing or specifications. Our engineering team will review and respond within 1 business day.