Germanium(Ge) Windows / Lenses

Infrared(IR) Lens / Windows

  • What is Infrared(IR) Lens?
    Infrared lenses are lenses designed to function in the infrared portion of the electromagnetic spectrum.
  • Which type of Infrared(IR) Lens SZLaser fabricate?
    Germanium(Ge), Zinc Selenide (ZnSe), Silicon, Zinc Sulfide (ZnS), Calcium fluoride (CaF₂), BaF₂
  • What is the use of Infrared(IR) Lens?
    It is ideal for IR applications and thermal imaging systems.
Click to download the tutorial for Infrared(IR) materials
Infrared Windows / Lenses
Picture
Material Performance
Application 
Ge Windows / Lenses
Click  To Ge Windows Page
 
  • High transmittance at 2~12um
  • High refractive index (4.0026@11um)
  • Thermal imager
  • Infrared temperature instrument
  • Long pass filter (for wavelengths greater than 2 µm)
  • Night sight
  • Armament
  • Space satellite
ZnSe Windows / Lenses
Click To ZnSe Windows Page
  • Wide transmission wavelengths from visible to infrared(600nm~16 µm)
  • Refractive index (2.4 at 10.6um)
  • Thermal imager
  • Infrared temperature instrument
  • FLIR
  • Night sight
  • High power CO2 laser window
  • Space satellite
  • Medical System
Silicon Windows / Lenses
Click To Silicon Windows Page
 
    
  • High transmittance at 1.2~8um
  • High refractive index (3.4 at 3~5um)
  • Thermal imager
  • Infrared temperature instrument
  • Long pass filter (for wavelengths greater than 2 µm)
  • Night sight
  • Laser mirror
  • Armament
  • Space satellite
CaF₂ Windows/Lenses
Click To CaF₂ Windows Page 
 
    
  • high transmission from the ultraviolet (180nm) to the infrared (8μm)
  • Thermal imager
  • Specroscopic
  • Mirror substrates for UV laser system
  • Substrate for manufacturing windows
  • Lenses for UV, IR applications
MgF₂ Crystal
Click To MgF₂ Windows Page 
 
    
  • Wavelength from 110nm to 7.5μm
  • Refractive Index No=1.37608; Ne=1.38771 (at 0.7μm)
  • high-powered laser
  • Space
  • And other UV applications

There are much fewer IR glasses than visible glasses.
       •     Refractive indices for IR glasses much higher.
– Visible: n = 1.45 – 2.0
– IR: n = 1.38 – 4.0
       •    Dispersion is often much lower for IR glasses.
–Visible: ν = 20 – 80
– IR: ν = 20 – 1000
  • Many IR glasses are opaque in the visible.
  • Most visible glasses are opaque in the IR.
  • IR glasses have significantly higher dn/dT values (x10 or more) – athermalizing difficult.
wdt_ID Material Refractive Index@4μm Refractive Index@10μm CTE (ppm/K) dn/dT (ppm/K) Knoop Hardness (g/mm²) Spectral Range
1 Germanium 4.0243 4.0032 6 396 800 2.0 – 17.0μm
2 Silicon 3.4255 N/A 2.7 150 1150 1.2 – 9.0μm
3 ZnS (Cleartran) 2.2523 2.2008 4.6 54 230 0.37 – 14.0μm
4 ZnSe 2.4331 2.4065 7.1 60 105 0.55 – 20.0μm
5 Magnesium Fluoride 1.3526 N/A 8 20 415 0.11 – 7.5μm
6 Sapphire 1.6753 N/A 5.6 13.7 1370 0.17 – 5.5μm
7 Gallium Arsenide 3.3069 3.2778 5.7 148 721 0.9 – 16.0μm
8 CaF₂ 1.4097 1.3002 18.9 -11 170 0.13 – 10.0μm
9 BaF₂ 1.458 1.4014 18.4 -15 82 0.15 – 12.5μm

Related Products

Zinc Sulfide (ZnS) Windows/Lenses
Zinc Sulfide (ZnS) Windows
Silicon Windows/Lenses
Silicon Windows/Lenses
Zinc Selenide (ZnSe) Windows / Lenses
Zinc Selenide (ZnSe) Windows / Lenses
Calcium fluoride (CaF₂) Windows/Lenses
Calcium fluoride (CaF₂) Windows/Lenses