Solid para- ${\mathrm{H}}_2$ is a promising gain medium for stimulated Raman scattering, due to its high number density and narrow Raman linewidth. In preparation for the design of a cw solid hydrogen Raman laser, we have made the first measurements, to our knowledge, of the index of refraction of a solid para- ${\mathrm{H}}_2$ crystal, in the wavelength range of $430–1100\mathrm{nm}$ . For a crystal stabilized at $4.4\mathrm{K}$ , this refractive index is measured to be $n_{{p-\mathrm{H}}_2}=1.130\pm 0.001$ at $514\mathrm{nm}$ . A slight, but significant, dependence on the final crystal-growth temperature is observed, with higher $n_{{p-\mathrm{H}}_2}$ at higher crystal-growth temperatures. Once a crystal is grown, it can be heated up to $10\mathrm{K}$ with no change in $n_{{p-\mathrm{H}}_2}$ . The refractive index varies only slightly over the observed wavelength range, and no significant birefringence was observed.

© 2011 Optical Society of America

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