S. N. For-a-review and . Bloembergen, more recent experimental results have been obtained by, Ann. Phys (Paris) Phys Rev. A, vol.10, issue.34, pp.681-2968, 1985.

R. Shen, The Principles of Non-Linear Optics, 1984.

P. Grynberg and . Verkerk, Collision-aided self-focusing and self-defocusing in sodium vapor, Optics Communications, vol.61, issue.4, p.296, 1987.
DOI : 10.1016/0030-4018(87)90111-8

G. Grynberg, L. Bihan, and M. Pinard, Two-wave mixing in sodium vapour, REFERENCES INTRODUCTION GENERALE |1| D. Bloch, M. Ducloy, pp.1321-73, 1983.
DOI : 10.1051/jphys:019860047080132100

URL : https://hal.archives-ouvertes.fr/jpa-00210324

|. D. Pepper, Spatial convolution and correlation of optical fields via degenerate four-wave mixing, Optics Letters, vol.3, issue.1, p.7, 1978.
DOI : 10.1364/OL.3.000007

|. J. White, Real???time image processing via four???wave mixing in a photorefractive medium, Applied Physics Letters, vol.37, issue.1, p.5, 1980.
DOI : 10.1063/1.91700

|. M. Levenson, High-resolution imaging by wave-front conjugation, Optics Letters, vol.5, issue.5, p.182, 1980.
DOI : 10.1364/OL.5.000182

|. F. Hopf, Interferometry using conjugate-wave generation, Journal of the Optical Society of America, vol.70, issue.11, p.1320, 1980.
DOI : 10.1364/JOSA.70.001320

|. J. Diels, Influence of wave-front-conjugated coupling on the operation of a laser gyro, Optics Letters, vol.6, issue.5, p.219, 1981.
DOI : 10.1364/OL.6.000219

A. Yariv and D. Pepper, Amplified reflection, phase conjugation, and oscillation in degenerate four-wave mixing, Optics Letters, vol.1, issue.1, p.16, 1977.
DOI : 10.1364/OL.1.000016

Y. R. Shen, The Principles of Non Linear Optics, 1984.

|. H. Rajbenbach and J. P. Huignard, Self-induced coherent oscillations with photorefractive Bi_12SiO_20 amplifier, Optics Letters, vol.10, issue.3, p.137, 1985.
DOI : 10.1364/OL.10.000137

|. J. Feinberg and R. Hellwarth, Phase-conjugating mirror with continuous-wave gain, Optics Letters, vol.5, issue.12, p.519, 1980.
DOI : 10.1364/OL.5.000519

R. Partie-b-i, |. A. Siegman, P. A. Belanger, and A. , Hardy in Optical Phase Conjugation edited by, p.466, 1983.

|. J. Feinberg and R. W. Hellwarth, Phase-conjugating mirror with continuous-wave gain, Optics Letters, vol.5, issue.12, p.519, 1980.
DOI : 10.1364/OL.5.000519

D. M. Bloom, P. F. Liao, and N. P. Economou, Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor, Optics Letters, vol.2, issue.3, p.58, 1978.
DOI : 10.1364/OL.2.000058

|. E. Le-bihan, M. Pinard, and G. Grynberg, Self-oscillations in a cavity bounded by a sodium-vapor phase-conjugate mirror pumped by two cross-polarized beams, Optics Letters, vol.11, issue.3, p.159, 1986.
DOI : 10.1364/OL.11.000159

|. J. Feinberg and G. D. Bacher, Self-scanning of a continuous-wave dye laser having a phase-conjugating resonator cavity, Optics Letters, vol.9, issue.9, p.420, 1984.
DOI : 10.1364/OL.9.000420

|. H. Rajbenbach and J. P. Huignard, Self-induced coherent oscillations with photorefractive Bi_12SiO_20 amplifier, Optics Letters, vol.10, issue.3, p.137, 1985.
DOI : 10.1364/OL.10.000137

|. A. Yariv and S. Kwong, Theory of laser oscillation in resonators with photorefractive gain, Optics Letters, vol.10, issue.9, p.454, 1985.
DOI : 10.1364/OL.10.000454

|. Y. Shen, The Principle of Non-linear Optics, § 9, 1984.

|. M. Pinard, B. Kleinmann, and G. Grynberg, Theory of degenerate four-wave mixing in three-level atoms, Optics Communications, vol.51, issue.4, p.281, 1984.
DOI : 10.1016/0030-4018(84)90058-0

|. G. Grynberg, B. Kleinmann, M. Pinard, and P. Verkerk, Amplified reflection in degenerate four-wave mixing: a more-accurate theory, Optics Letters, vol.8, issue.12, p.614, 1983.
DOI : 10.1364/OL.8.000614

|. H. Gibbs, M. Call, and T. N. Venkatesan, Differential Gain and Bistability Using a Sodium-Filled Fabry-Perot Interferometer, Physical Review Letters, vol.36, issue.19, p.1135, 1976.
DOI : 10.1103/PhysRevLett.36.1135

|. G. Marowsky, K. Kaufmann, and I. J. , Influence of spatial hole burning on the output power of a CW dye ring laser, IEEE Journal of Quantum Electronics, vol.12, issue.3, p.207, 1976.
DOI : 10.1109/JQE.1976.1069117

|. F. Aranowitz and R. J. Collins, MODE COUPLING DUE TO BACKSCATTERING IN A He???Ne TRAVELING???WAVE RING LASER, Applied Physics Letters, vol.9, issue.1, p.55, 1966.
DOI : 10.1063/1.1754599

E. E. Bergman, High-efficiency pulsed 106-??m phase-conjugate reflection via degenerate four-wave mixing, Optics Letters, vol.3, issue.3, p.82, 1979.
DOI : 10.1364/OL.3.000082

R. L. Carman, R. Lhias, and P. Kelley, Observation of Degenerate Stimulated Four-Photon Interaction and Four-Wave Parametric Amplification, Physical Review Letters, vol.17, issue.26, p.1281, 1966.
DOI : 10.1103/PhysRevLett.17.1281

|. D. Bloom, P. F. Liao, and N. P. Economou, Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor, Optics Letters, vol.2, issue.3, p.58, 1978.
DOI : 10.1364/OL.2.000058

|. R. Lind and D. G. Steel, Demonstration of the longitudinal modes and aberration-correction properties of a continuous-wave dye laser with a phase-conjugate mirror, Optics Letters, vol.6, issue.11, p.554, 1981.
DOI : 10.1364/OL.6.000554

|. J. Feinberg and R. W. Hellwarth, Phase-conjugating mirror with continuous-wave gain, Optics Letters, vol.5, issue.12, p.519, 1980.
DOI : 10.1364/OL.5.000519

M. Pinard, D. Grandclément, and G. Grynberg, Continuous-Wave Self-Oscillation Using Pair Production of Photons in Four-Wave Mixing in Sodium, Europhysics Letters (EPL), vol.2, issue.10, p.755, 1986.
DOI : 10.1209/0295-5075/2/10/003

|. S. Reynaud, C. Fabre, and E. Giacobino, to be published in JOSA D. Walls and C. Savage, to be published in, Opt. Lett, vol.4, p.177, 1983.

|. J. Weiland and H. Wilhelmsson, Coherent Non Linear Interaction of Waves in Plasmas, 1977.

J. P. Huignard and A. Marrakchi, Coherent signal beam amplification in two-wave mixing experiments with photorefractive Bi12SiO20 crystals, Optics Communications, vol.38, issue.4, p.249, 1981.
DOI : 10.1016/0030-4018(81)90392-8

|. H. Rajbenbach and J. P. Huignard, Self-induced coherent oscillations with photorefractive Bi_12SiO_20 amplifier, Optics Letters, vol.10, issue.3, p.137, 1985.
DOI : 10.1364/OL.10.000137

P. Yeh, Photorefractive coupling in ring resonators, Applied Optics, vol.23, issue.17, p.2974, 1984.
DOI : 10.1364/AO.23.002974

|. N. Bloembergen, Non Linear Optics, p.29, 1965.

|. G. Grynberg and M. Pinard, Radiative Relaxation-Induced Extra Resonances in Multiwave Mixing, Europhysics Letters (EPL), vol.1, issue.3, p.129, 1986.
DOI : 10.1209/0295-5075/1/3/006

A. Rosenthal, Regenerative Circulatory Multiple-Beam Interferometry for the Study of Light-Propagation Effects, Journal of the Optical Society of America, vol.52, issue.10, p.1143, 1962.
DOI : 10.1364/JOSA.52.001143

W. M. Macek and D. Davis, ROTATION RATE SENSING WITH TRAVELING???WAVE RING LASERS, Applied Physics Letters, vol.2, issue.3, p.67, 1963.
DOI : 10.1063/1.1753778

F. Aronowitz, Theory of a Traveling-Wave Optical Maser, Physical Review, vol.139, issue.3A, p.635, 1965.
DOI : 10.1103/PhysRev.139.A635

W. W. Chow, The ring laser gyro, Reviews of Modern Physics, vol.57, issue.1, p.61, 1985.
DOI : 10.1103/RevModPhys.57.61

J. J. Roland and G. P. , Optical gyroscopes, Optics & Laser Technology, vol.13, issue.5, p.239, 1981.
DOI : 10.1016/0030-3992(81)90049-9

|. V. Vali and R. W. Shorthill, Fiber ring interferometer, Applied Optics, vol.15, issue.5, p.1099, 1976.
DOI : 10.1364/AO.15.001099

|. J. Diels, I. C. Mc, and . Michael, Influence of wave-front-conjugated coupling on the operation of a laser gyro, Optics Letters, vol.6, issue.5, p.219, 1981.
DOI : 10.1364/OL.6.000219