Wideband Raman comb generation using a high-Q liquid-hydrogen droplet

Summary form only given. Liquid hydrogen is the simplest molecular-liquid known as a quantum liquid. Unique feature of liquid hydrogen is that H/sub 2/ molecules consisting of the liquid have well-defined vibrational and rotational quantum states as free molecules in the gas phase. We treat the liquid hydrogen as a nonlinear Raman medium and carry out stimulated Raman scattering (SRS) experiments in the droplet. We show that a cavity Q-value exceeding 10/sup 9/ is readily obtainable. We demonstrate also that the SRS generates many multiple-order sideband series through vibrational and rotational coherences covering whole ultraviolet-visible spectral region from 200 to 1000 nm, leading to a super wideband optical comb generator.