Amplification of higher-order modes by stimulated Raman scattering in H_2-filled hollow-core photonic crystal fiber

摘要

We report a method for amplifying higher-order guided modes, synthesized with a spatial light modulator, in a hydrogen-filled hollow-core photonic crystal fiber. The gain mechanism is intermodal stimulated Raman scattering, a pump laser source in the fundamental mode providing amplification for weak higher-order seed modes at the Stokes frequency. The gain for higher-order modes up to LP_(31) is calculated and verified experimentally.