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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Far-infrared thin-film beam splitters: calculated properties.

D R Smith, E V Loewenstein

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This summary is machine-generated.

Calculations show that averaged optical constants are valid for plastic beam splitters in far infrared Michelson interferometers, even with material birefringence. This simplifies the design of optical components for infrared spectroscopy.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Michelson interferometers are crucial for far-infrared spectroscopy.
Beam splitters are key optical components in interferometers.
Plastic materials offer potential advantages for beam splitter fabrication.

Purpose of the Study:

To calculate the properties of beam splitters made from four specific plastic materials.
To assess the validity of using averaged optical constants for birefringent materials in this application.

Main Methods:

Optical constants were calculated for Surlyn, Aclar, Mylar, and Kapton.
Averaged optical constants were employed despite material birefringence.
Beam splitter characteristics were derived from these averaged constants.

Main Results:

The study determined the optical properties of beam splitters for the specified plastic materials.
It was demonstrated that using averaged optical constants provides valid beam splitter characteristics.
The procedure is effective even when the plastic materials exhibit birefringence.

Conclusions:

Averaged optical constants are suitable for characterizing plastic beam splitters in far-infrared Michelson interferometers.
This approach simplifies the analysis and design of infrared optical components.
The findings support the use of these plastics for fabricating effective beam splitters.