Self-oscillation, phase-conjugate

An example of coherent noise is the scattering noise from the pump beam, which is coherent with respect to, and can therefore interfere with, the pump beam. Numerous reports in the current literature of self-pumped phase conjugators, oscillators, and so forth are based on this process or its variants. In Chapter 12, we... 

Fig. 4. Schematic of the setup for optical wavefront conjugation using a liquid-ciystal (LC) film. Ex, object beam, 2- reference beam, A aber-rator, M mirror, mirror to be used for self-oscillation effect, VBS variable beam splitter to control the intensity of E, BS beam splitter, R total reflector. For an example of wavefront conjunction result, see Fekete et al. [20] (isotropic phase of liquid crystal) or [20] (nematic phase).

H. Rajbenbach and J. P. Huignard, Self induced coherent oscillations with photorefractive Bi,2Si02o amplifier, Opt. Lett., vol. 10, pp. 137-139, 1985 J. Feinberg and R. W. Hellwarth, Phase-conjugating mirror with continuous-wave gain, Opt. Lett., vol. 5, pp. 519-521, 1980. 

Cronin-Golomb, M., B. Fisher, J. O. White, and A. Yariv. 1983. Passive phase conjugate mirror based on self-induced oscillation in an optical ring cavity. Appl. Phys. Lett. 42 919. 

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