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We report the generation of narrow-linewidth 637.2 nm laser by single-passsum-frequency generation (SFG) of two infrared lasers at 1560.5 nm and 1076.9nm in PPMgO:LN crystal. Over 8.75 W of single-frequency continuously tunable637.2 nm laser is realized, and corresponding conversion efficiency is 38%. Westudy the behavior of crystals with different poling periods. The detailedexperiments show that the output red lasers have very good power stability andbeam quality. This high-performance 637.2 nm laser is significant for therealization of high power ultra-violet (UV) 318.6 nm laser via cavity-enhancedfrequency doubling. Narrow-linewidth 318.6 nm laser is important for Rydbergexcitation of cesium atoms via single-photon transition.

Realization and characterization of single-frequency tunable 637.2 nm high-power laser