Share Email Print

Optical Engineering

Design and analysis of a strip-coated parallel-slab beam splitter for the equi-partition of infrared input power
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

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.

Paper Details

Date Published: 1 January 2002
PDF: 5 pages
Opt. Eng. 41(1) doi: 10.1117/1.1417499
Published in: Optical Engineering Volume 41, Issue 1
Show Author Affiliations
Aed M. El-Saba, Univ. of South Alabama (United States)
Rasheed M. A. Azzam, Univ. of New Orleans (United States)

© SPIE. Terms of Use
Back to Top