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本文从四能级结构激光速率方程出发，推导出了有关受抑全内反射调Ｑ开关（ＦＴＩＲＱ）激光器的最佳输出耦合系数，给出了该开关单脉冲输出的条件，确定了ＦＴＩＲ－Ｑ开关的最佳工作状态。
In this paper, based on the four-level structure of the laser rate equation, the optimal output coupling coefficient of the frustrated total internal reflection Q-switch (FTIR-Q) laser is deduced. The condition of the single pulse output of the switch is given. The FTIR -Q switch the best working condition.