Materials

Umicore Infrared Optics offers blanks, built-to-prints and custom lens and assembly designs made from GASIR®, a chalcogenide glass with a much wider spectral range than Germanium and very favourable thermal properties.

Introducing GASIR®

Umicore's GASIR® chalcogenide glass is an ideal material for both high-performance infrared imaging systems and high-volume commercial applications. GASIR® can be finished with traditional manufacturing technologies as well as by molding. Coated GASIR® has a wider transmission spectrum than germanium, and GASIR® blanks are more cost-effective and more stably priced than germanium blanks.

Umicore offers two materials, GASIR1 and GASIR5. Both are available as blank materials, finished lenses or in off-the-shelf infrared lenses.

GASIR® - Optics for the Future

Our unique molding process allows us to manufacture finished asphero-diffractive lens geometry in medium to large volume production runs with a very competitive price-performance ratio. For low to medium volume needs GASIR® can be manufactured with polishing or diamond turning.

Compared to germanium, the traditional infrared material, GASIR® offers a wider transmission spectrum and much better athermalization possibilities .
 

GASIR®'s key advantages are:

  • Cost-effective material for blanks, preforms and finished optics
  • Wider spectral range than germanium. GASIR® is transparent from 0.8 µm up to 16 µm
  • 8 times lower change of refractive index with temperature than germanium, allowing simple athermalized design
  • Molding process allowing for high volume, cost effective optics

 

 

Germanium ZnS ZnSe GASIR®1 GASIR®5
Transmission domain 1.8 - 16 µm 2 - 12 µm 0.5 - 22 µm 0.8 - 16 µm 0.8 - 16 µm
Refractive index (@ 10 µm) 4.00 2.20 2.20 2.49 2.78
Abbe number (8 - 12 µm) 942 23 58 120 160
dn/dT at 10 µm (10-6) 396 41 61 55 32
Absorption coefficient (10-3cm-1) 27 200 0.5 30 10
Specific weight (g/cm3) 5.32 4.08 5.27 4.40 4.62
Upper use temperature 70 °C - - 240 °C 155 °C

 

Potential applications for GASIR® include:

 

  • Automotive
  • Thermal imaging & Thermography
  • Firefighting
  • Marine
  • Security and Surveillance
  • Medical Imaging and Diagnostics
  • Smart Sensing & IoT

GASIR®1 material datasheet

GASIR®5 material datasheet