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Proceedings Paper

Intracavity Techniques For High Reflectivity Phase Conjugation At 10 µm In Germanium And Inverted CO[sub]2[/sub]
Author(s): B. J. Feldman; R. A. Fisher; E. E. Bergmann; R. G. Tercovich; F. C. Sena; I. J. Bigio
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Paper Abstract

We have generated phase-conjugate, 10 μm reflection from the grating established with counterpropagating waves in both germanium samples located within an oscillating TEA CO2 laser cavity and in the CO2 gain medium itself. The work in germanium is the first demonstration of nonlinear phase conjugation in the infrared and of intracavity degenerate 4-wave mixing. The work within the CO2 gain medium is the first demonstration of 10.6 μm phase conjugation in an inverted medium. In our first experiments we used a hybrid, single line, TEA laser with a peak output intensity of 2 MW/cm2. A wedged germanium flat output mirror was reversed so that the Ge coupler, internal to the cavity, served as the nonlinear medium. This intracavity technique eliminated the difficulty of precisely aligning a pair of counter-propagating beams in the nonlinear sample. Using an infrared vidicon, we demonstrated that the placement of an aberrator in the beam line had little effect on the germanium reflected signal, whereas the same aberrator in front of a reference mirror caused substantial distortion.

Paper Details

Date Published: 13 November 1980
PDF: 1 pages
Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); doi: 10.1117/12.957780
Show Author Affiliations
B. J. Feldman, University of California (United States)
R. A. Fisher, University of California (United States)
E. E. Bergmann, University of California (United States)
R. G. Tercovich, University of California (United States)
F. C. Sena, University of California (United States)
I. J. Bigio, University of California (United States)

Published in SPIE Proceedings Vol. 0190:
Los Alamos Conference on Optics 1979
Donald H. Liebenberg, Editor(s)

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