Intracavity Techniques For High Reflectivity Phase Conjugation At 10 µm In Germanium And Inverted CO[sub]2[/sub]

B. J. Feldman; R. A. Fisher; E. E. Bergmann; R. G. Tercovich; F. C. Sena; I. J. Bigio

doi:10.1117/12.957780

13 November 1980 Intracavity Techniques For High Reflectivity Phase Conjugation At 10 µm In Germanium And Inverted CO₂

B. J. Feldman, R. A. Fisher, E. E. Bergmann, R. G. Tercovich, F. C. Sena, I. J. Bigio

Proceedings Volume 0190, Los Alamos Conference on Optics 1979; (1980) https://doi.org/10.1117/12.957780
Event: Los Alamos Conference on Optics '79, 1979, Los Alamos, United States

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.

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B. J. Feldman, R. A. Fisher, E. E. Bergmann, R. G. Tercovich, F. C. Sena, and I. J. Bigio "Intracavity Techniques For High Reflectivity Phase Conjugation At 10 µm In Germanium And Inverted CO₂", Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); https://doi.org/10.1117/12.957780

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KEYWORDS

Germanium

Phase conjugation

Reflectivity

Mirrors

Carbon dioxide

Carbon dioxide lasers

Infrared radiation

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