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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%。
The self-made photonic crystal fiber (PCF) is used to increase the central wavelength λ0 of the pumping pulse and make it mainly in the anomalous dispersion region. Spectral changes under different nonlinear effects are observed, especially the significant anti-Stokes phenomenon . By adjusting the incident direction of the coupling beam, the fiber is stably output as the first higher order mode. When λ0 reaches and exceeds the zero-dispersion wavelength (820 nm) of the first high-order mode, the pump operates in an anomalous dispersion region and its energy transfer to anti-Stokes waves gradually increases. Especially when λ0 exceeds 860 nm, the intensity of anti-Stokes waves can reach 5 times the residual intensity of the pumping wave and the conversion efficiency reaches 80%.