Germanium Positive Meniscus Lenses — GLH92 Series
From $506 USD
Request a quoteProduct description
GLH92 positive meniscus lenses are made from single-crystal germanium (Ge) and combine one convex surface with one concave surface. They are thicker at the center than at the edge, converge incident light, and are designed to reduce third-order spherical aberration.
Positive meniscus lenses are often combined with other lenses to reduce focal length and increase numerical aperture. When focusing a collimated beam, orient the convex side toward the source.
The two source radii R1 and R2 are listed separately; verify their surface assignment in the model drawing.
Schematic
Dimensions in mm unless otherwise stated.
Available per-model coatings: Uncoated; IR2 antireflection coating; average reflectance <1.5% over 8–12μm.
Germanium is used in infrared and thermal imaging, with a source-stated transmission range of 2.0–16 μm and high refractive index. Use gloves, avoid direct contact, and wash hands after handling, as directed by the source handling note.
Antireflection coatings reduce surface reflections and ghost images. Fixed lens mounts, including mounts with SM05, SM1 or SM2 threads, are separate components; check clearance for high-curvature lenses.
General specifications
General specifications apply at series level. R1 and R2 retain the positive source convention even for negative-focus models; no surface sign is inferred. Optical power values retain the source values; the source field does not specify a unit. Model drawings take precedence for precision design.
- Material
- Germanium (Ge) single crystal
- Design wavelength
- 10.6μm
- Diameter tolerance
- +0.0/-0.1mm
- Center thickness tolerance
- ±0.2mm
- Focal length tolerance
- ±1%
- Centration error
- <3 arcmin
- Surface quality
- 60-40
- Clear aperture
- >90% of diameter
- Edge bevel
- Protective bevel 0.2mm×45°
- Handling note
- Use gloves, avoid direct contact, and wash hands after handling.
Available specifications
USD unit prices. Shipping, taxes and dispatch timing are confirmed with your quotation. Select models and quantities to build your quote list.
12 models
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Compare up to four fields. Expand a model to read every specification.
Dia. = diameter; CT = center thickness; ET = edge thickness; BFL = back focal length. Units remain shown in each heading.
| Details | Quote | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GLH92-025-025 | Germanium (Ge) single crystal | 25 | 25 | 2.5 | 1.3 | 23.3 | 28.3 | 42.5 | Uncoated | $506 | ||
| GLH92-025-030 | Germanium (Ge) single crystal | 25 | 30 | 2.5 | 1.5 | 28.3 | 33.4 | 50 | Uncoated | $506 | ||
| GLH92-025-035 | Germanium (Ge) single crystal | 25 | 35 | 2.5 | 1.6 | 33.3 | 38.4 | 57.6 | Uncoated | $506 | ||
| GLH92-050-050 | Germanium (Ge) single crystal | 50 | 50 | 5 | 2.6 | 46.7 | 56.6 | 84.9 | Uncoated | $2,745 | ||
| GLH92-050-075 | Germanium (Ge) single crystal | 50 | 75 | 5 | 3.5 | 71.6 | 81.9 | 122.8 | Uncoated | $2,124 | ||
| GLH92-050-100 | Germanium (Ge) single crystal | 50 | 100 | 5 | 3.8 | 96.5 | 107 | 160.5 | Uncoated | $1,878 | ||
| GLH92-025-025-IR2 | Germanium (Ge) single crystal | 25 | 25 | 2.5 | 1.3 | 23.3 | 28.3 | 42.5 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $564 | ||
| GLH92-025-030-IR2 | Germanium (Ge) single crystal | 25 | 30 | 2.5 | 1.5 | 28.3 | 33.4 | 50 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $564 | ||
| GLH92-025-035-IR2 | Germanium (Ge) single crystal | 25 | 35 | 2.5 | 1.6 | 33.3 | 38.4 | 57.6 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $564 | ||
| GLH92-050-050-IR2 | Germanium (Ge) single crystal | 50 | 50 | 5 | 2.6 | 46.7 | 56.6 | 84.9 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $2,846 | ||
| GLH92-050-075-IR2 | Germanium (Ge) single crystal | 50 | 75 | 5 | 3.5 | 71.6 | 81.9 | 122.8 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $2,225 | ||
| GLH92-050-100-IR2 | Germanium (Ge) single crystal | 50 | 100 | 5 | 3.8 | 96.5 | 107 | 160.5 | IR2 antireflection coating; average reflectance <1.5% over 8–12μm | $1,979 | ||
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Technical notes
Review the material, dimensions and other specifications listed for the individual model. Check any available curves against the model's stated operating range.
Illustrations and printable specification summaries are reference information, not manufacturing drawings. Confirm technical suitability and final requirements with your quotation.
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