| Self-pumped phase conjugation and mutually pumped phase conjugation (MPPC) is the key technology in adaptive optical heterodyne detection system. The dynamic response characteristics and output characteristics of MPPC determine the performance of adaptive optical heterodyne detection system in a sense.Firstly, the dynamic response characteristics of MPPC are studied. The influence of the coupling strength, the amplitude ratio of incident pump beams and the fanning effect to the settling time and steady-state efficiency of the photorefractive grating is discussed by solving numerically the dynamic nonlinear four-wave mixing equations in MPPC. Accordingly, preset grating in MPPC to shorten the response time of MPPC is studied theoretically and experimentally.Secondly, the output characteristics of MPPC are studied. A computational model with multiple coupled interaction regions is proposed to analyze the output characteristics of MPPC under an electronics-like point of view on four-wave mixing. Using the model, the output characteristics of MPPC is studied under the conditions of asymmetric incident position and different incident intensity. The experimental results are in agreement with theoretical simulations. The incident pump ratio determines the reflectivity of MPPC under asymmetric incident position and saturation intensity of MPPC is about0.5microwatt.Finally, some suggestions are present to improve the adaptive optical heterodyne detection system.The work in paper provides the experimental and theoretical support to improve the dynamic response characteristics and the output characteristics of the adaptive optical heterodyne detection system. |
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