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Proceedings Paper

Precision Broadband Far-Infrared Attenuator
Author(s): Fritz Keilmann
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Paper Abstract

With the advance of far-infrared laser applications the need arises to vary the radiation intensity over a large dynamic range. An example is laser radar where a return loss of 50 or even 100 db has to be achieved without distorting the wavefront. First we review the more common techniques used to attenuate FIR laser beams, and then describe a new step attenuator that uses diffracting metal mesh screens to attenuate the laser radiation. Broadband performance over nearly one decade of frequency is achieved. The design can handle even higher peak and average FIR powers than are available at present, while maintaining beam quality in all respects, including arbitrary input polarization.

Paper Details

Date Published: 26 September 1986
PDF: 6 pages
Proc. SPIE 0666, Far-Infrared Science and Technology, (26 September 1986); doi: 10.1117/12.938837
Show Author Affiliations
Fritz Keilmann, Max-Planck-Institut fur Festkorperforschung (Germany)


Published in SPIE Proceedings Vol. 0666:
Far-Infrared Science and Technology
Jerald A. R. Izatt, Editor(s)

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