Two Cavity Ge and ZnS Multilayer IR Bandpass Filter Deposition Capabilities

Denton Vacuum demonstrates the capability of depositing a Two Cavity IR Bandpass Filter by evaporation. An optical bandpass filter (BPF) is a device that passes wavelengths within a certain range and blocks wavelengths outside that range. Infrared bandpass filters are used in a wide range of applications, including thermal imaging (night vision), instrumentation, biochemical and environmental testing

In this technical white paper, we explore:

  • A two cavity IR bandpass filter that allows frequencies in the 5 µm (5000nm) wavelength range
  • A filter constructed of Germanium (Ge) and Zinc Sulfide (ZnS) thin films of quarter wave optical thickness (QWOT)
  • Several key factors of temperature, thickness control and material conditioning

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