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针对二阶非线性X~(2)级联产生等效五阶非线性的过程,研究发现基频光感应到的级联五阶非线性相移会随着其在整个过程中所遭受到的能量损耗的加剧而增大。与材料固有非线性所产生的多光子吸收效应有着本质的区别,该级联非线性过程中所形成的基频光能量损耗是可控的。在数值模拟计算的基础上,提出了在级联五阶非线性过程之后引入倍频光与基频光相互作用的差频过程,最终实现了基频光在感应到大的级联五阶非线性相移的同时无能量损耗效应。
Aiming at the fifth-order nonlinearity of the second-order nonlinear X ~ (2) cascade, it is found that the fifth-order non-linear phase shift induced by the fundamental frequency light will change with the whole process Increased energy loss and increase. It is essentially different from the multiphoton absorption effect caused by the inherent nonlinearity of the material. The energy loss of the fundamental frequency light formed in the cascaded nonlinear process is controllable. Based on the numerical simulation, the difference frequency process of introducing double frequency light into the fundamental frequency light after the cascade fifth-order nonlinear process is proposed. Finally, Linear phase shift without energy loss.