Trabold B M, Abdolvand A, Euser T G, Russell P St J
Opt Express. 2013 Dec 2;21(24):29711-8. doi: 10.1364/OE.21.029711.
A strong anti-Stokes Raman signal, from the vibrational Q(1) transition of hydrogen, is generated in gas-filled hollow-core photonic crystal fiber. To be efficient, this process requires phase-matching, which is not automatically provided since the group velocity dispersion is typically non-zero and--inside a fiber--cannot be compensated for using a crossed-beam geometry. Phase-matching can however be arranged by exploiting the different dispersion profiles of higher-order modes. We demonstrate the generation of first and second anti-Stokes signals in higher-order modes by pumping with an appropriate mixture of fundamental and a higher-order modes, synthesized using a spatial light modulator. Conversion efficiencies as high as 5.3% are achieved from the pump to the first anti-Stokes band.
在充气空心光子晶体光纤中产生了来自氢的振动Q(1)跃迁的强反斯托克斯拉曼信号。为了实现高效，该过程需要相位匹配，而这并非自动实现，因为群速度色散通常非零，并且在光纤内部无法使用交叉光束几何结构进行补偿。然而，可以通过利用高阶模的不同色散分布来实现相位匹配。我们通过使用空间光调制器合成的基模和高阶模的适当混合进行泵浦，证明了在高阶模中产生一阶和二阶反斯托克斯信号。从泵浦到一阶反斯托克斯波段的转换效率高达5.3%。
