25 August 2008 Single-beam phase conjugation for lasers phase locking and image formation
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Single-beam phase conjugation (self-phase conjugation, or SPC) was observed in the ferroelectric crystal LiNbO3:Fe using CW HeNe laser (wavelength 632 nm power 10-36 mW). Effective "out/in" reflection coefficient of phase conjugation (defined as the ratio the output phase-conjugated beam to the input laser beam measured before optical elements) was about 30%. For some crystals efficient phase conjugation was followed by the simultaneous generation of Fabry-Perot modes. Phase locking of two HeNe lasers and imaging of the amplitude objects with the help of self-phase conjugation was demonstrated. Appearances of additional beams (in transmission and reflection) have some analogy with the predicted behavior of the "negative-index materials".
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Nickolai V. Kukhtarev, Nickolai V. Kukhtarev, Tatiana Kukhtareva, Tatiana Kukhtareva, Michael J. Curley, Michael J. Curley, Gregory Stargell, Gregory Stargell, Sergey S. Sarkisov, Sergey S. Sarkisov, } "Single-beam phase conjugation for lasers phase locking and image formation", Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70560G (25 August 2008); doi: 10.1117/12.801264; https://doi.org/10.1117/12.801264

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