IR Polarizers

Calomel polarizers represent a unique mono crystal device with high extinction ratio (ER). MIR and LWIR spectral ranges are currently covered just by wire-grid or holographic polarizers. These types provide only limited ER and damage threshold values. Because of Calomel’s unique properties such as a high value of birefringence, wide transparency range and positive uni-axial material, it poses a great candidate for this purpose. These polarizers are valuable components in a wide range of applications such as:

  • IR spectroscopy
  • Polarimetry
  • Astronomy
  • Thin films analysis
  • Optical laboratories
  • Photonics research centers
  • Crystal growth

High power laser sources (CO, CO2)

Until recently, calcite was the only suitable material for the construction of polarizers in the visible and near infra-red spectral regions. In order to operate in the infra-red and far-infrared region, grid polarizers and specially designed thin film plate polarizers were required. Calomel is the only known material which can polarize light continuously from the visible to far infra-red regions. Therefore, one polarizer of Calomel can replace at least two or more polarizers depending on the wavelength of the light beam. In commercial applications Calomel crystals should enable manufacturers to produce more powerful, smaller and lighter devices at a reduced cost.



Performance comparison of CALOMEL polarizers for infrared grid polarizers



Power Rating:



Some Characteristic Features of Calcite versus CALOMEL



Due to the relatively low optical damage (occurring at powers higher than 50 MW/cm2) CALOMEL polarizers can be used in combination with high power lasers for laser processing (drilling, cutting, annealing, etc.). Unlike calcite polarizers which operate at low to medium power levels, and film plate polarizers which have to be specially designed for each high power laser at every wavelength, CALOMEL has the flexibility to work across-the-board from low to high power. Generally, CALOMEL can be used in infra-red polarization optics i.e. photography, spectroscopy, environmental control devices and other applications.