Stimulated Raman scattering in vacuum-deposited solid hydrogen

Solid hydrogen is the simplest molecular crystal and is known as a quantum crystal. Solid hydrogen has been spotlighted as promising candidates for various applications such as spectroscopy, nonlinear optics, pulse compression, and electromagnetically induced transparency. The key point is its extremely narrow Raman width for the vibrational transition, which enables to produce a large Raman coherence. Solid film enables to do the wave-mixing experiment with finite angle and to reduce the dispersion. In this contribution, we have investigated the simulated Raman scattering in solid hydrogen film prepared by the vacuum-deposition method. The para-hydrogen solid was prepared in the cryostat-module by depositing the para-hydrogen solid onto a 0.2 mm-thick sapphire substrate. Raman coherence was prepared by two ns-lasers whose laser-frequency difference is equal to the fundamental vibrational transition of para-hydrogen. The generated Raman sideband spectra were measured using a grating spectrometer with CCD detector. In conclusion, we observed the collinear generation of Raman side band in solid hydrogen prepared by using the vacuum-deposition method.