The general multi-photon FPE, the state equation and the spectrum of transmitted light in good cavity limit are obtained- The two-photon optical bistability spectrum of transmitted light is calculated and compared with single-photon case.

• 得到多光子过程普遍的Fokker-Planck方程、态方程以及良腔情况下透射光谱公式。 计算了n光子双稳态的透射光谱并与单光子情况进行比较。