Abstract
An intense and monochromatic laser beam consisting of more than 40 vibrational and rotational lines is generated by the stimulated Raman effect, when two-color laser beams separated by ∼590 cm−1 are tightly focused into pressurized hydrogen. This phenomenon is reasonably explained by four-wave mixing; one beam is used for two-step excitation (ω1+ω1) to an imaginary level and another beam (ω2) acts as a seed beam, generating a fourth beam (2ω1−ω2). Through cascade processes, so many laser emissions appear with a frequency difference of (ω1−ω2) in entire ultraviolet and visible regions.
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Imasaka, T., Kawasaki, S. & Ishibashi, N. Generation of more than 40 laser emission lines from the ultraviolet to the visible regions by two-color stimulated raman effect. Appl. Phys. B 49, 389–392 (1989). https://doi.org/10.1007/BF00324191
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DOI: https://doi.org/10.1007/BF00324191