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We demonstrate a reliable continuous-wave (cw) laser source at the1\,$S$--2\,$P$ transition in (anti)hydrogen at 121.56\,nm (Lyman-$\alpha$)based on four-wave sum-frequency mixing in mercury. A two-photon resonance inthe four-wave mixing scheme is essential for a powerful cw Lyman-$\alpha$source and is well investigated.

A reliable cw Lyman-$\alpha$ laser source for future cooling of antihydrogen