Blank Materials for Infrared Optics

Umicore Infrared Optics offers built-to-print lens and assembly design as well as blanks made out of GASIR®, a chalcogenide glass with a much wider spectral range than Germanium as well as a dn/dt that is 8 times as low.


Umicore's GASIR® chalcogenide glass is an ideal material for both high-performance infrared imaging systems and high-volume commercial applications. GASIR® has a dn/dt 8 times lower than germanium and a much wider spectral range covering NIR, MWIR and LWIR. GASIR® can be finished with traditional manufacturing technologies as well as by molding.

Coated GASIR®1 has a wider transmission spectrum than germanium, and GASIR® blanks are less costly and more stably priced than germanium blanks.

GASIR®  - optics for new and existing applications

A unique molding process allows the manufacture of finished, spherical, aspherical and diffractive lens geometry in medium to large volume production runs with a competitive price-performance ratio. For low to medium volume needs GASIR® can be manufactured with polishing or diamond turning.

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

Umicore offers GASIR® both as blank material, lens or in off-the-shelf infrared lenses.

GASIR®'s key advantages are:

  • More stable pricing than germanium with the possibility for long term fix pricing
  • 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

Potential application fields for GASIR®  include:

  • Automotive night vision and sensing
  • Security and surveillance
  • Thermography and predictive maintenance
  • Fire fighting
  • Smart sensing
  • Defense

GASIR®1 for Infrared Optics

GASIR®5 for Infrared Optics


  • CIOE 2016

    Umicore has successfully exhibited at the China International Optoelectronic Exposition in Shenzhen, China, the first week of September. Join us there next year!



  • 4 Mar 2016

    Umicore is proud to announce another addition to its range of off-the-shelf LWIR lenses. This 3.7 mm f/1.3 lens is compatible with the latest-generation of 12 µm detectors and more.