The master equation of a three-level atomic system interacting with a two-mode field at two-photon resonance is given. The two-photon gain coefficient formula is deduced.

给出了阶梯型三能级原子系统在相等偏调情况下的运动主方程，得到了双光子增益系数公式。

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Analyzing the carrier density and photon density of VCL in active region, the physical mechanism of gain clamping was revealed.

分析有源区内载流子和VCL光子密度的变化，揭示了增益钳制的物理机理。

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Using rate equation theory, the equation group including the population inversion density of the gain medium, photon density and the absorber ground state population density is acquired.

利用速率方程理论，得到包含激光增益介质反转密度、光子密度和饱和吸收介质基态布居数密度的速率方程组。

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