在受驱动光学系统中增设内腔多光子吸收元件是抑制腔场噪声的有效手段。为在好腔条件(ｋ《γ∥，γ⊥)下获得低噪声强光场，应选用高吸收非线性元件。若所需场强较弱，在主动腔状态应选用非线性吸收最低的双光子吸收体，在被动腔状态则应让系统工作在无吸收状态。

A intracavity multiphoton absorber in driven optical systems is a effective means to depress the internal field fluctuation. To obtain the field with reduced noise in the good cavity condition. The high nonlinearity of multiphoton absorption is needed for a strong field, while for weak field the lowest nonlinearity of two-photon absorption in active cavity or non-absorption in a passive cavity are suggested.