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IR Optics

Attenuated Total Reflection (ATR) elements

The inherent strength, wide spectral transparency and chemical resistance combination of diamond makes it an ideal crystal for ATR applications. Other ATR crystal such as ZnSe or Ge can be scratched or corroded with some materials under test, however diamond is significantly more resistant to this effect. Diamond can be configured into planar or complex geometric shapes for ATR applications. The configuration of the ATR element and the optical light path will determine what diamond type is best suited for the application. Both natural and synthetic diamond types can be used. A further option to stand alone crystal is mounting the crystal to a suitable frame or fixture.

Windows for process control

In situ process monitoring has been shown to be the most effective way to ensure that a final product meets or exceeds specification. For many aggressive chemical processes, viewing the process is limited due to temperature and pressure of the environment. Both natural and synthetic diamond (CVD) can overcome many of these impediments. A planar piece of diamond is typically attached to a metal frame creating a component that can be attached to a process line. The diamond window assembly can be engineered and specified to withstand extreme conditions. Certain processes may not be extreme, but can still utilize diamond for its chemical inertness and durability. Extended lifetime of a view port may lead to a benefit of less maintenance and down time providing valuable cost savings.

Type IIA IR window for process inspections

CVD diamond windows in an IR transmission cell

Synchrotron windows

A CVD diamond window has been incorporated into a titanium flange. The window assembly has been designed for use in infrared beamlines. To obtain a flat spectra, a wedge of 1° is induced over the thickness of the diamond window reducing possible interference fringes in the far infrared. The standard flange is available for 2 window sizes, 15.0 and 20.0 mm in diameter with a clear aperture of 10.0 and 15.0 mm respectively. The assemblies are rated to 1 bar pressure differential, bakeable to 200° C and are leak tight to 2 x 10-10 mbar l/s.

Thermal imaging windows

Diamond has exceptional transmission characteristics in the 8-14 µm wavelengths. A diamond window produced from either natural or synthetic diamond can be processed to achieve high flatness and low roughness that reduces distortion in the transmitted wavefront. The high thermal conductivity of diamond may also be an advantage in novel thermal window applications.

Thermal image through a high quality CVD diamond planar window.