第Ⅰ类BBO晶体中的参量荧光空间特性理论研究

Theoretical study on spatial property of parametric fluorescence in a type Ⅰ BBO crystal

采用第Ⅰ类相位匹配BBO晶体的放大传递函数方法,分别对光参量放大过程中单波长信号光注入和多波长信号光注入出现的参量荧光的空间特性进行了详细的理论研究。结果表明:一方面单波长信号光注入时,在某一特定的非共线角和相位匹配角下,它是以泵浦光为中心,呈锥形分布的,而在其它相位匹配区域内,则呈环形分布;另一方面,在多波长信号光入射情况下,参量荧光的光谱在某一特定的相位匹配角下集中分布在很宽的范围内,而在其余相位匹配区域内,参量荧光光谱呈分散分布状态。该结论对于光参量放大中三波群速失配的补偿,高增益和窄脉冲宽度的参量光的产生以及对于参量荧光的控制提供了理论依据,并且对于近年来量子图像处理和量子通讯等领域所关注的纠缠光场的产生也具有参考价值。

Using the amplification transfer function of typeⅠ BBO crystal, the theoretical study of spatial properties of the optical parametric fluorescence generated by homochromatic signal and polychromatic signal in optical parametric amplification is investigated. The numerical simulation results demonstrate that when the homochromatie signal is injected into optical parametric amplifier, the fluorescence signal is first emitted in a cone and then in a ring while centering on the pump wave direction. For the amplification of the polychromatic signal pulse, the spectrum of the fluorescence is over a wide wavelength range under a special phase matching angle. The result provides a theoretical reference for controlling the generation of the optical parametric fluorescence and quantum entanglement states, which is referable for the development of quantum imaging, quantum communication and other fields.