Polarization Optics


Calomel IR polarization components represent unique products for infrared applications. Our polarizers exhibiting a highest extinction ratio (ER) in comparission with other market competitors. The current optical market of MWIR/LWIR polarizers is covered only by wire-grid or holographic types of polarizers. These types provide only low ER and damage threshold values which limit the final performance for the applications.



  • Highest ER on the market >1: 20 000
  • Wide transparency range (0.4μm-17μm)
  • High value of birefringence (Δn=0.55)
  • CW laser damage load resistance


Another significant advantage of Calomel crystal is that it is optically positive, so polarizers transmit the ordinary (o) beam, whereas the extraordinary one is reflected and makes it a great material for mid-infrared polarizers and phase delay components. This is an exceptional feature of mercurous chloride material. We also provide manufacturing possibilities of other different types of polarization components depending on the customer´s needs. Please feel free to contact us for inquiry.




  • Polarizers                                (Glan-Foucault, Dove, Wollaston)
  • Scramblers                              (depolarizers)
  • Polarizing beamsplitters         (beam displacing prisms)
  • Phase delay prisms                 (interferometry and spectroscopy)
  • Manufactured from high purity Calomel monocrystals
  • Transmitted and polarized ordinary o-ray for applications
  • High extinction ratio (ER) values compared to market competitors
  • 10x10mm or 15x15mm clear aperture
  • Applicable for high-power CW lasers
  • Mounted in 360° rotational protective housing
  • 40-20 Scratch-Dig surface quality of input and exit faces
  • Infrared spectroscopy of materials (polymers and crystallography)
  • Infrared microscopy (sample characterization)
  • MWIR thermal imaging systems
  • Thin film measurement
  • Analysis in infrared astronomy
  • Laser polarization and beam attenuation
  • Coupling devices for MWIR and LWIR lasers
  • Thermal imaging
Glan-Foucault Calomel polarizer
Parameter Value
Extinction Ratio 0.632µm      >1:1000
2.5 – 17µm      >1:15000
Substrate Hg2Cl2 (Calomel monocrystal)
Design air-spaced
Transmission Range 0.38 – 17µm
Clear Optical Aperture 10mm x 10mm/15mm x 15mm
Field of View ±10°
AR coating 1-5μm, (>5μm in development)
Surface quality 40-20 Scratch-Dig
Wollaston Calomel polarizer
Calomel MWIR polarizers
Carina Nebula pillar taken by Hubble telescope
Calomel MWIR polarizers

Interested in Calomel polarization optics? Please contact us on info(at)calomel.cz for inquiry.