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23 January 1997 High-efficiency laser coupling in BaTiO3 mutually pumped phase-conjugate mirror using novel configurations
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We have discovered for mutually pumped phase conjugation (MPPC) of two incoherent beams which are all remarkably insensitive to angular and lateral positional changes in either of the two input beams or in the photorefractive BaTiO3 crystal itself. By designed choosing the geometry such as the orientation between the pump beam and the crystal's c-axis the grating can be dominated and two lasers can be coupled efficiently. Three novel configurations can be formed in photorefractive crystals when the MPPC occurred. These configurations are part of a family of mutually pumped phase-conjugate mirrors (MPPCMs) all of which have similar internal beam paths within the crystal having three internal reflections. These configurations provide broad interaction, which offer with more efficient, and large angular and positional acceptance, and even high resolution and stability. We also experimentally demonstrate our discovery of a new double mutually pumped phase- conjugate mirror (DMPPCM) which phase conjugate three incident beams in pairs operating as two MPPCMs in the same crystals at the same time but in different orientations. These characteristics make these configurations particularly interesting for practical applications such as for phase locking lasers and for optical free space communications.
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Chi Ching Chang and David R. Selviah "High-efficiency laser coupling in BaTiO3 mutually pumped phase-conjugate mirror using novel configurations", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997);

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