Germanium Meniscus Lenses

  • High Index of Refraction
  • Minimal Chromatic Aberration Due to Low Dispersion
  • Perfect for Rugged IR Applications

Our Germanium Meniscus Lenses are perfect for Mid-Infrared applications. They stand up well to harsh environments and we offer the most popular sizes with Anti-Reflection Coatings. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, they should be used at temperatures below 100°C. Germanium’s high density (5.33 g/cm3) should be considered when designing for weight-sensitive systems. The Knoop Hardness of Germanium is 780, making it ideal for IR applications requiring rugged optics.

Additional coatings and custom sizes available for OEM volumes, contact our Applications Engineering Department to discuss your requirements.

 View Legend
Description Stock No. Price In Stock  
Showing 1-10 of 10 Items | Sort by Spec
12.7mm Dia x 12.7mm FL Germanium Meniscus Lens
NT63-287 $375.00 Click to receive an email with delivery information. Click to add this item to your cart.
Diameter (mm) 12.70
Effective Focal Length EFL @ 12μm (mm) 12.90
Effective Focal Length EFL @ 10.6μm (mm) 12.70
Effective Focal Length EFL @ 5.0μm (mm) 12.80
Effective Focal Length EFL @ 2.94μm (mm) 12.70
Center Thickness CT (mm) 2.50
Edge Thickness ET (mm) 2.10
Radius R1 (mm) 22.96
Radius R2 (mm) 15.59
RoHS Exempt
12.7mm Dia x 25.4mm FL Germanium Meniscus Lens
NT63-288 $375.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 12.70
Effective Focal Length EFL @ 12μm (mm) 24.90
Effective Focal Length EFL @ 10.6μm (mm) 25.00
Effective Focal Length EFL @ 5.0μm (mm) 24.70
Effective Focal Length EFL @ 2.94μm (mm) 24.50
Center Thickness CT (mm) 2.00
Edge Thickness ET (mm) 1.80
Radius R1 (mm) 40.27
Radius R2 (mm) 27.13
RoHS Exempt
12.7mm Dia x 50.8mm FL Germanium Meniscus Lens
NT63-289 $375.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 12.70
Effective Focal Length EFL @ 12μm (mm) 49.80
Effective Focal Length EFL @ 10.6μm (mm) 50.00
Effective Focal Length EFL @ 5.0μm (mm) 49.50
Effective Focal Length EFL @ 2.94μm (mm) 49.00
Center Thickness CT (mm) 2.00
Edge Thickness ET (mm) 1.90
Radius R1 (mm) 79.43
Radius R2 (mm) 52.84
RoHS Exempt
25.4mm Dia x 25.4mm FL Germanium Meniscus Lens
NT63-290 $425.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 24.90
Effective Focal Length EFL @ 10.6μm (mm) 25.00
Effective Focal Length EFL @ 5.0μm (mm) 24.70
Effective Focal Length EFL @ 2.94μm (mm) 24.50
Center Thickness CT (mm) 3.00
Edge Thickness ET (mm) 2.00
Radius R1 (mm) 37.15
Radius R2 (mm) 26.30
RoHS Exempt
25.4mm Dia x 38.1mm FL Germanium Meniscus Lens
NT63-291 $425.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 38.10
Effective Focal Length EFL @ 10.6μm (mm) 38.00
Effective Focal Length EFL @ 5.0μm (mm) 37.90
Effective Focal Length EFL @ 2.94μm (mm) 37.50
Center Thickness CT (mm) 2.70
Edge Thickness ET (mm) 2.00
Radius R1 (mm) 53.95
Radius R2 (mm) 38.04
RoHS Exempt
25.4mm Dia x 50.8mm FL Germanium Meniscus Lens
NT63-292 $359.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 49.80
Effective Focal Length EFL @ 10.6μm (mm) 50.00
Effective Focal Length EFL @ 5.0μm (mm) 49.50
Effective Focal Length EFL @ 2.94μm (mm) 49.00
Center Thickness CT (mm) 3.00
Edge Thickness ET (mm) 2.50
Radius R1 (mm) 74.47
Radius R2 (mm) 51.45
RoHS Exempt
25.4mm Dia x 63.5mm FL Germanium Meniscus Lens
NT63-293 $359.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 62.30
Effective Focal Length EFL @ 10.6μm (mm) 63.00
Effective Focal Length EFL @ 5.0μm (mm) 62.00
Effective Focal Length EFL @ 2.94μm (mm) 61.40
Center Thickness CT (mm) 3.00
Edge Thickness ET (mm) 2.60
Radius R1 (mm) 93.11
Radius R2 (mm) 63.68
RoHS Exempt
25.4mm Dia x 76.2mm FL Germanium Meniscus Lens
NT63-294 $359.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 75.30
Effective Focal Length EFL @ 10.6μm (mm) 75.00
Effective Focal Length EFL @ 5.0μm (mm) 75.00
Effective Focal Length EFL @ 2.94μm (mm) 74.20
Center Thickness CT (mm) 2.80
Edge Thickness ET (mm) 2.40
Radius R1 (mm) 104.23
Radius R2 (mm) 72.78
RoHS Exempt
25.4mm Dia x 101mm FL Germanium Meniscus Lens
NT63-295 $359.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 99.60
Effective Focal Length EFL @ 10.6μm (mm) 100.00
Effective Focal Length EFL @ 5.0μm (mm) 99.20
Effective Focal Length EFL @ 2.94μm (mm) 98.20
Center Thickness CT (mm) 3.00
Edge Thickness ET (mm) 2.70
Radius R1 (mm) 161.06
Radius R2 (mm) 106.15
RoHS Exempt
25.4mm Dia x 125mm FL Germanium Meniscus Lens
NT63-296 $359.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 25.40
Effective Focal Length EFL @ 12μm (mm) 128.20
Effective Focal Length EFL @ 10.6μm (mm) 127.00
Effective Focal Length EFL @ 5.0μm (mm) 127.60
Effective Focal Length EFL @ 2.94μm (mm) 126.30
Center Thickness CT (mm) 2.90
Edge Thickness ET (mm) 2.70
Radius R1 (mm) 187.07
Radius R2 (mm) 127.35
RoHS Exempt
 Sort by Spec
 
Substrate Germanium (Optical Grade)
Diameter Tolerance +0.00/-0.13mm
Center Thickness Tolerance ±0.2mm
Focal Length Tolerance ±2% at Design Wavelenth
Surface Accuracy 1/20λ @ 10.6μm
Surface Quality 60-40
Clear Aperture 90% of Diameter
Design Wavelength (DWL) 10.6μm
Coating None