对三波混频光参量放大器中参量过程的带宽进行了研究,给出了具有普遍意义的参量带宽和增益带宽的数学显式模型,这些模型引入了非线性晶体长度、群速、色散、增益系数等变量对带宽的影响,依据这些模型对影响参量放大器中带宽的各种因素进行了模拟计算、分析和比较,结果表明:信号光和闲置光之间的群速度失配是影响参量放大过程带宽的主要因素,当信号光和闲置光之间实现群速度匹配时,可以获得最宽的带宽,因此对于任何三波混频光参量放大器中的参量过程,都可以通过选择合适的非共线角、非线性晶体长度、抽运光强度来获得最宽的带宽,从而支持超宽带增益.

The bandwidth of three wave mixing optical parametric amplifiers has been investigated. The general mathematical models for evaluating parametric bandwidth and gain bandwidth of three wave mixing parametric amplifiers are developed via three wave noncollinear interactions, the models take into account crystal length, noncollinear angle, group velocity, group velocity dispersion and gain coefficient effects. The results show that the bandwidths are mostly limited by the group velocity mismatch between the signal and idler. Therefor, for any a three wave mixing parametric amplifier, the widest bandwidth can be obtained by choosing noncollinear angle, crystal length and pump intensity, and the super broad bandwidth gain can be realized.