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从理论上计算具有两个作用区的互泵浦相位区轭器的阈值耦合强度（γＬ）ｔｈ，给出了（γＬ）ｔｈ与输入光强比ｑ、光折变晶体内部通道强度传输系数Ｔｔ；的规律。
The threshold coupling strength (γL) th of the mutual pumping phase yoke with two active regions is theoretically calculated. The relationship between (γL) th and the input light intensity ratio q, the internal channel intensity transfer coefficient Tt of the photorefractive crystal ; The law.