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Tellurite And Fluorotellurite Glasses For Active And Passive

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6. Optical properties; MDO 168<br />

Fig. (6.1): Setup of a typical dual beam absorption spectrometer [3].<br />

The spectrometer consists of a source of radiation with a beamsplitter, a sample and a<br />

detector [3].<br />

Radiation sources<br />

In the far-infrared (FIR), a mercury arc inside a quartz envelope is used. In the near-<br />

infrared (NIR), a Nernst filament is used. This consists of a heated ceramic element,<br />

doped with rare-earth oxides [3].<br />

Dispersing element<br />

Source<br />

Sample<br />

Reference<br />

Beam<br />

combiner<br />

Detector<br />

Grating<br />

The dispersing element separates various frequencies into different spatial directions to<br />

record the change in absorption with frequency. The simplest component to use is a

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