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Proceedings Paper

Evaluation Of Heavy Metal Fluoride Glasses For Use With The Erbium (YAG) Laser
Author(s): Glenn Merberg; Mahmoud Shahriari; George Sigel Jr.
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Paper Abstract

A power delivery system capable of delivering high energy densities of infrared radiation at 2.94μm is required for the application of the Erbium YAG laser in the medical industry. Conventional silica fibers have high intrinsic absorption coefficients in this spectral region, making them unsuitable for this application. Alternatively, heavy metal fluoride glasses possess very low intrinsic loss at this wavelength, and also offer transparency in the visible part of the spectrum. These glasses are very hygroscopic, however, and the fundamental OH stretching absorption band occurs in the spectral region of interest. In this work heavy metal fluoride glass samples were prepared with a variety of processing conditions and compositions. The techniques of laser calorimetry and integrated scatter measurement were employed to obtain the absorptive and scattering components of the total optical attenuation at 2.94μm independently. Absorption was found to dominate over the scattering loss at this wavelength. Comparison of laser calorimetry and scattering data with IR spectrometer data indicates that the OH absorption peak is a transparency limiting factor in this spectral region for the best optical quality samples. Of the glass samples prepared for this work the minimum absorption coefficient obtained at 2.94μm was 0.0075cm-1, and the minimum scattering loss measured at this wavelength was 1.14 x 10-5cm-1. These minima were both measured on an aluminum fluoride based glass sample.

Paper Details

Date Published: 2 June 1989
PDF: 7 pages
Proc. SPIE 1048, Infrared Fiber Optics, (2 June 1989); doi: 10.1117/12.951382
Show Author Affiliations
Glenn Merberg, Rutgers University (United States)
Mahmoud Shahriari, Rutgers University (United States)
George Sigel Jr., Rutgers University (United States)

Published in SPIE Proceedings Vol. 1048:
Infrared Fiber Optics
James A. Harrington; Abraham Katzir, Editor(s)

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