Germanium Plano-Convex Lenses — GLH91 Series
From $203 USD
Request a quoteProduct description
GLH91 plano-convex lenses have one flat surface and one convex surface, with a positive focal length. They focus collimated light, collimate point sources and reduce beam divergence.
Single-crystal germanium is used for infrared focusing and thermal imaging. The source lists a material transmission range of 2–16 μm and a design wavelength of 10.6 μm.
To reduce spherical aberration when focusing a collimated beam, orient the curved surface toward the incoming light. When collimating a point source, orient the flat surface toward the source.
Schematic
Dimensions in mm unless otherwise stated.
Options include uncoated and IR2 antireflection coating for 8–12 μm; the source specifies average reflectance below 1.5%. Use gloves and wash hands after handling. Export availability, destination and delivery timing must be confirmed with your quotation.
Antireflection coatings reduce surface reflection and help suppress ghost reflections. Choose the wavelength range specified for the individual model.
Select a mount appropriate to the lens diameter and curvature. Compatible thread sizes described in the source include SM05 (0.535″-40), SM1 (1.035″-40) and SM2 (2.035″-40). Mounts and other components are separate from the lens.
The schematic is for reference only and must not be used as a manufacturing drawing. Refer to the individual model specifications and drawing for engineering decisions.
General specifications
GLH91 series specifications; individual model specifications take precedence.
- Material
- Single-crystal germanium (Ge)
- RoHS (supplier specification)
- Compliant, as stated by supplier
- Design wavelength
- 10.6μm
- Surface quality (scratch-dig)
- 60-40
- Diameter tolerance
- +0.0/-0.1mm
- Center thickness tolerance
- ±0.2mm
- Focal length tolerance
- ±1%
- Centration
- <3 arcmin
- Clear aperture
- >90% of diameter
- Chamfer
- Protective chamfer 0.2mm×45°
- Handling
- Use gloves when handling germanium and wash hands after use.
Available specifications
USD unit prices. Shipping, taxes and dispatch timing are confirmed with your quotation. Select models and quantities to build your quote list.
24 models
Choose comparison fields
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| GLH91-012-015 | Single-crystal germanium (Ge) | 12.7 | 15 | 2.5 | 2 | 14.4 | 45.1 | Uncoated | $203 | ||
| GLH91-012-020 | Single-crystal germanium (Ge) | 12.7 | 20 | 2.3 | 2 | 19.4 | 60.1 | Uncoated | $203 | ||
| GLH91-012-040 | Single-crystal germanium (Ge) | 12.7 | 40 | 2.2 | 2 | 39.4 | 120.2 | Uncoated | $203 | ||
| GLH91-025-025 | Single-crystal germanium (Ge) | 25.4 | 25.4 | 3.1 | 2 | 24.6 | 76.3 | Uncoated | $275 | ||
| GLH91-025-050 | Single-crystal germanium (Ge) | 25.4 | 50 | 4 | 3.5 | 48.5 | 150.3 | Uncoated | $275 | ||
| GLH91-025-075 | Single-crystal germanium (Ge) | 25.4 | 75 | 4 | 3.6 | 73.7 | 225.5 | Uncoated | $275 | ||
| GLH91-025-100 | Single-crystal germanium (Ge) | 25.4 | 100 | 4 | 3.7 | 98.8 | 300.7 | Uncoated | $275 | ||
| GLH91-025-150 | Single-crystal germanium (Ge) | 25.4 | 150 | 4 | 3.8 | 148.8 | 451 | Uncoated | $275 | ||
| GLH91-025-200 | Single-crystal germanium (Ge) | 25.4 | 200 | 4 | 3.9 | 198.9 | 601.4 | Uncoated | $275 | ||
| GLH91-025-500 | Single-crystal germanium (Ge) | 25.4 | 500 | 2.1 | 2 | 499.5 | 1501.9 | Uncoated | $275 | ||
| GLH91-025-750 | Single-crystal germanium (Ge) | 25.4 | 750 | 2 | 2 | 749.5 | 2252.9 | Uncoated | $275 | ||
| GLH91-025-1000 | Single-crystal germanium (Ge) | 25.4 | 1000 | 2 | 2 | 999.5 | 3303.9 | Uncoated | $275 | ||
| GLH91-012-015-IR2 | Single-crystal germanium (Ge) | 12.7 | 15 | 2.5 | 2 | 14.4 | 45.1 | IR2 AR coating: Ravg<1.5% @8–12μm | $275 | ||
| GLH91-012-020-IR2 | Single-crystal germanium (Ge) | 12.7 | 20 | 2.3 | 2 | 19.4 | 60.1 | IR2 AR coating: Ravg<1.5% @8–12μm | $275 | ||
| GLH91-012-040-IR2 | Single-crystal germanium (Ge) | 12.7 | 40 | 2.2 | 2 | 39.4 | 120.2 | IR2 AR coating: Ravg<1.5% @8–12μm | $275 | ||
| GLH91-025-025-IR2 | Single-crystal germanium (Ge) | 25.4 | 25.4 | 3.1 | 2 | 24.6 | 76.3 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-050-IR2 | Single-crystal germanium (Ge) | 25.4 | 50 | 4 | 3.5 | 48.5 | 150.3 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-075-IR2 | Single-crystal germanium (Ge) | 25.4 | 75 | 4 | 3.6 | 73.7 | 225.5 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-100-IR2 | Single-crystal germanium (Ge) | 25.4 | 100 | 4 | 3.7 | 98.8 | 300.7 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-150-IR2 | Single-crystal germanium (Ge) | 25.4 | 150 | 4 | 3.8 | 148.8 | 451 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-200-IR2 | Single-crystal germanium (Ge) | 25.4 | 200 | 4 | 3.9 | 198.9 | 601.4 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-500-IR2 | Single-crystal germanium (Ge) | 25.4 | 500 | 2.1 | 2 | 499.5 | 1501.9 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-750-IR2 | Single-crystal germanium (Ge) | 25.4 | 750 | 2 | 2 | 749.5 | 2252.9 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
| GLH91-025-1000-IR2 | Single-crystal germanium (Ge) | 25.4 | 1000 | 2 | 2 | 999.5 | 3303.9 | IR2 AR coating: Ravg<1.5% @8–12μm | $390 | ||
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Curves
Technical notes
Paraxial thin-lens estimate: f ≈ R / (n − 1), where R is the curved-surface radius and n is the refractive index at the relevant wavelength. Use each model’s listed focal length and back focal length.
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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