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Continuous coherent radiation in the vacuum-ultraviolet at 122 nm(Lyman-alpha) can be generated using sum-frequency mixing of three fundamentallaser beams in mercury vapour. One of the fundamental beams is at 254 nmwavelength, which is close to the 6^1S_0-6^3P_1 resonance in mercury.Experiments have been performed to investigate the effect of this one-photonresonance on phasematching, absorption and the nonlinear yield. The efficiencyof continuous Lyman-alpha generation has been improved by a factor of 4.5.

Influence of the 6^1S_0-6^3P_1 Resonance on Continuous Lyman-alpha Generation in Mercury