Nonlinear optics in solid hydrogen

We show through experiments of stimulated Raman scattering how solid hydrog en (parahydrogen) can open new perspectives on nonlinear optics. Two phenom ena are described: One is the self-induced phase matching in parametric ant i-Stokes stimulated Raman scattering (SRS) in which the phase matching is s elf-organized automatically without the stringent restriction of refractive -index dispersion of the medium, and the other is the extremely slow cohere nce decay behavior for the Raman transition that may result in the Raman wi dth of 80 Wt full width at half maximum (FWHM).