Abstract

We present the first reported observation in the infrared of nonlinear phase-conjugated reflection. This was achieved via degenerate four-wave mixing in polycrystalline germanium. The observation was facilitated by taking advantage of the counterpropagating (strong) waves internal to a pulsed CO₂ laser cavity. The measured effective reflectivity was 2% with a 10-mm interaction length. This simple intracavity technique is generally applicable to any nonlinear material transparent at the wavelength of the laser into which it is inserted.

© 1978 Optical Society of America

Doppler-free continuous-wave phase-conjugate spectrum of SF₆ by resonant degenerate four-wave mixing at 10.6 μm

P. Aubourg, J. P. Bettini, G. P. Agrawal, P. Cottin, D. Guérin, O. Meunier, and J. L. Boulnois
Opt. Lett. 6(8) 383-385 (1981)

On-resonant phase-conjugate reflection and amplification at 10.6 μm in inverted CO₂

Robert A. Fisher and B. J. Feldman
Opt. Lett. 4(5) 140-142 (1979)

Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor

D. M. Bloom, P. F. Liao, and N. P. Economou
Opt. Lett. 2(3) 58-60 (1978)

Continuous-wave backward-wave generation by degenerate four-wave mixing in ruby

P. F. Liao and D. M. Bloom
Opt. Lett. 3(1) 4-6 (1978)

Degenerate four-wave mixing in absorbing media

R. L. Abrams and R. C. Lind
Opt. Lett. 2(4) 94-96 (1978)