Mixing of the frequencies 88.37 THz (λ = 3.39μ), 125.13 THz (λ = 2.39 μ), and 260.1 THz (λ = 1.15 μ) in a gas, and production of continuous coherent emission with combined frequency 473.6 THz (λ = 0.63 μ)
Klement'ev V.M., Matyugin Yu.A., Chebotaev V.P.
We report, for the first time, the mixing of three infrared frequencies corresponding to wavelengths 3.39, 2.39, and 1.15 μ, and production of coherent continuous emission at the combined frequency of wavelength 0.63 μ in a gas. Effective continuous frequency conversion was realized via nonlinear interaction of three fields that are resonant with adjacent transitions in neon. Owing to the resonance conditions, the addition of the frequencies in the gas turned out to be more effective by 8-10 orders of magnitude than in nonlinear optical crystals.