Journal ArticleDOI
Far-infrared thin-film beam splitters: calculated properties
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TLDR
Properties of beam splitters for a far Michelson interferometer have been calculated for four plastic materials: Surlyn, Aclar, Mylar, and Kapton and it is shown that this procedure yields valid beam splitter characteristics.Abstract:
Properties of beam splitters for a far ir Michelson interferometer have been calculated for four plastic materials: Surlyn, Aclar, Mylar, and Kapton. Although the materials are birefringent, the averaged optical constants are used; and it is shown that this procedure yields valid beam splitter characteristics.read more
Citations
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Journal ArticleDOI
Silicon beam splitter for far-infrared and terahertz spectroscopy
Christopher C. Homes,G. Lawrence Carr,Ricardo P. S. M. Lobo,Joseph D. LaVeigne,David B. Tanner +4 more
TL;DR: In addition to superior long-wavelength performance that extends well into the terahertz region, the silicon beam splitter has the additional advantage that its efficiency displays little polarization dependence.
Journal ArticleDOI
Mylar beam-splitter efficiency in far infrared interferometers: angle of incidence and absorption effects
TL;DR: Optimum performance of an interferometer in terms of highest and most uniform modulation efficiency for unpolarized radiation will be obtained by selecting the beam-splitter thickness to cover the wavenumber range of interest within the first interference lobe and by utilizing higher angles of incidence than the mechanically convenient 45 degrees.
Journal ArticleDOI
Bilayer free-standing beam splitter for Fourier transform infrared spectrometry
Nelson Rowell,E. A. Wang +1 more
TL;DR: A two-layer free-standing beam splitter for use in far-infrared Fourier transform infrared spectrometers has an efficiency that is higher than that of the best combination of four single-layer Mylar beam splitters currently in use for spectrometry from 50 to 550 cm(-1).
Journal ArticleDOI
New designs for far-infrared beam splitters
TL;DR: It is shown that the performance of the beam splitters is not sensitive to the accuracy with which the layer thicknesses can be controlled, however, it does depend strongly on the lowest available refractive index of the coating materials.
Journal ArticleDOI
Balloon-borne far-infrared Michelson interferometer for atmospheric emission studies.
D. J. W. Kendall,T. A. Clark +1 more
TL;DR: A series of far-ir Michelson interferometers utilizing the rapid-scanning technique have been designed and built for balloon-borne measurement of the emission spectrum of the stratosphere, and the merits of this type of instrumentation for monitoring stratospheric trace gas constituent concentrations are discussed.
References
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Journal ArticleDOI
Optical constants of far infrared materials. 3: plastics.
TL;DR: Room temperature optical constants of plastic materials have been measured over the 50-350-cm(-1) spectral range and the refractive index was calculated from the channeled spectrum as observed in reflection from the sample, while the absorption coefficient was determined from a transmission measurement.
Journal ArticleDOI
Polarization properties of far infra-red beamsplitters
TL;DR: In this paper, the energy throughput of an interferometer is calculated for the case where an unsupported thin film is used as a beamsplitter, and the polarization of the beam toward the detector is calculated, and it is shown that by setting the beam at the Brewster angle rather than at the usual 45 degrees, a completely polarized output beam can be produced with very little loss of energy.
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