利用自制的光子晶体光纤(PCF),通过逐渐增加抽运脉冲的中心波长λ0,使其主要处于反常色散区,观测到了不同非线性效应作用下的频谱变化尤其是显著的反斯托克斯现象。通过调节耦合光束的入射方向,使光纤稳定输出为第一高阶模。在λ0达到并超过第一高阶模的零色散波长(820 nm)的过程中,抽运波工作在反常色散区,其向反斯托克斯波的能量转化逐渐增强。尤其当λ0超过860 nm之后,反斯托克斯波的强度可达到抽运波剩余强度的5倍,转换效率达到了80%。

Using photonic crystal fiber (PCF) fabricated by ourselves, the changes of frequency spectrum and remarkable anti-Stokes phenomenon caused by a series of nonlinear effects have been observed through increasing the central wavelength λ0 of pump pulse to mainly make it located in the abnormal dispersion region. By adjusting the incidence angle of the coupling light, the first-higher-order mode is output from PCF. In the process of λ0 achieving and exceeding 820 nm which is the zero-dispersion wavelength of the first-higher-order mode, the working region of pump pulse is in abnormal dispersion region and the energy transform from pump pulse to anti-Stokes wave is increasing gradually. Especially when λ0 exceeds 860 nm, the intensity of anti-Stokes wave is five times more than the intensity of residual pump energy, and the transform-efficiency exceeds 80%.