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Refractive index measurements of solid parahydrogen

Manori Perera, Brian A. Tom, Yuki Miyamoto, Michael W. Porambo, Lauren E. Moore, William R. Evans, Takamasa Momose, and Benjamin J. McCall

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Abstract

Solid para-H2 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-H2 crystal, in the wavelength range of 430–1100 nm. For a crystal stabilized at 4.4 K, this refractive index is measured to be np−H2=1.130±0.001 at 514 nm. A slight, but significant, dependence on the final crystal-growth temperature is observed, with higher np−H2 at higher crystal-growth temperatures. Once a crystal is grown, it can be heated up to 10 K with no change in np−H2. 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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