All optical control of self-pumped phase conjugation from BaTiO3:Co photorefractive crystal

We investigate self-pumped phase conjugation (SPPC) generation process and its temporal instability, to demonstrate an all optical control of SPPC output. The optical configuration (incident angle and position) region at which stable SPPC output is obtainable by effective stimulated photorefractive backscattering-four wave mixing (SPB-FWM) process is limited. Therefore, with non-optimized optical configuration, cat conjugation occurs together with SPB-FWM and then SPPC output becomes temporally unstable. The same is the case with even when the optical configuration is fixed as SPB-FWM interaction length becomes longer. We discuss the cause of temporal instability to propose the beam trajectory model when SPPC output is unstable, based on the experimental results using a new method inducing the control beam whose wavelength is different from the incident beam simultaneously. Moreover, using the method mentioned previously, we demonstrate an all optical control of SPPC output and the generation of temporally stable SPPC output with the optical configuration that SPPC output has been temporally unstable in the conventional methods. Extending the generation region of stable SPPC output will lead to the generation of SPPC from high power lasers in simple system. Moreover, it will also contribute to the realization of all optical image processing and computing, for example, multiple parallel image subtraction and addition.