List of Division publications with links

2012-07-18 12:26 - Intermodal stimulated Raman scattering in hydrogen-filled hollow-core photonic crystal fiber

M. Ziemienczuk, A. M. Walser, A. Abdolvand, and P. St. J. Russell, JOSA B, Vol. 29, Issue 7, pp. 1563-1568 (2012)

Stimulated Raman scattering is investigated in a slightly multimode gas-filled hollow-core photonic crystal fiber. Although, second-order Stokes light appears in the fundamental mode below a certain threshold energy, it is observed to switch to a two-lobed higher order mode above this threshold. Conversion to the higher order mode is made possible by the creation of a two-lobed moving coherence wave in the gas that provides both phase-matching and a strong intermodal pump-Stokes overlap. A theoretical model is developed, based on this physical interpretation that agrees quantitatively with the experimental results. The results suggest new opportunities for all-fiber gas-based nonlinear processes requiring phase-matching, such as coherent anti-Stokes Raman scattering, as well as providing a means (for example) of efficiently converting light from a higher order pump mode to a fundamental Stokes mode.