Design and analysis of a strip-coated parallel-slab beam splitter for   the equi-partition of infrared input power

Aed M. El-Saba; Rasheed M. A. Azzam

doi:10.1117/1.1417499

1 January 2002 Design and analysis of a strip-coated parallel-slab beam splitter for the equi-partition of infrared input power

Aed M. El-Saba, Rasheed M. A. Azzam

Author Affiliations +

Optical Engineering, Vol. 41, Issue 1, (January 2002). https://doi.org/10.1117/1.1417499

Several recent applications in ellipsometry, spectropolarim- etry, and multiplexed galvanometric scanners require a single compact beamsplitter capable of splitting an input beam of light into four or more components. Of special interest is the design of a single beam splitter to produce multiple components of equal power for incident unpolarized or circularly polarized light. We present a specific infrared design of a parallel-slab beamsplitter that uses a fused silica, which is strip-coated with a Ge thin film on the front and a uniform Ag coating on the back. Equal powers among the first four components can be achieved when the unpolarized reflectance levels on the first, second, third, and fourth strip are ?20, 68, 54, and 18%, respectively. Specific designs at wavelengths of 1.55, 2.02, and 5.0 ?m are presented. At a wavelength of 5.0 ?m, glass shows some absorption and is replaced by another transparent slab material. The choice of optical materials and thicknesses of the strips provide sufficient flexibility in the design and operation of the beamsplitter.

©(2002) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Aed M. El-Saba and Rasheed M. A. Azzam "Design and analysis of a strip-coated parallel-slab beam splitter for the equi-partition of infrared input power," Optical Engineering 41(1), (1 January 2002). https://doi.org/10.1117/1.1417499

Published: 1 January 2002

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