Beam splitters broadband

A commercial high-resolution FTS is depicted in Fig. 4.2. The output of the broadband source is focused on a circular aperture (entrance iris). As in the dispersive set-up, the optical beam is made parallel by a collimating mirror, and it intercepts a beam splitter at a non-normal incidence (usually 45 or 60°). One part of the beam is transmitted towards a fixed plane mirror while the other part towards a plane mirror, which can be translated continuously or in steps at a given distance (scan mirror). The beams reflected back by... 

The light is split into two separate beams one beam for the ceramic specimen and another beam for a reference material. A broadband beam splitter should be used. One option is called a polka-dot splitter, which consists of mirror dots on a fused-silica plate whereby the split ratio becomes 50 50 (relatively independent of wavelength) for beam cross sections above a certain minimum. The beams pass through two rotating... 

The fundamental part of the instrument is the so-called Michelson interferometer. It consists of a beam splitter and two mirrors, one fixed, the other movable (Figure 18). The infrared radiation, emitted by a broadband source. 

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