James, S.W. and Eason, R.W.
Intensity dependent thresholding and switching in the bridge mutually pumped phase conjugator
At 3rd European Quantum Electronics Conference (EQEC '91) & 10th National Quantum Electronics Conference (QE10), United Kingdom.
27 - 30 Aug 1991.
The large electro-optic coefficient of photorefractive materials such as BaTiO3 has allowed the observation of several exotic phase conjugators, such as the Self-Pumped Phase Conjugator (SPPC) and, more recently, the Mutually Pumped Phase Conjugator (MPPC), in which two simultaneous phase conjugate (PC) outputs are produced via the interaction of two mutually incoherent beams within a photorefractive material. Several generic configurations of MPPC have been observed, such as the Double Phase Conjugate Mirror (DPCM), the Mutually incoherent beam coupler (MIBC) and the Bridge MPPC.
Wave mixing configurations in photorefractive materials generally show input beam intensity ratio dependent effects (both the MIBC and DPCM bave been shown to posses beam ratio dependent reflectivities and thresholds for example), but the only total input intensity dependent effect usually observed is the rise time dependence of the refractive index gratings. Here we report the observation of total intensity dependent PC reflectivity in the Bridge MPPC, which bas allowed the investigation of optical thresbolding and bistability/hysteresis.
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