Gz. Zhang et al., NONLINEAR-OPTICAL GENERATION USING ELECTROMAGNETICALLY INDUCED TRANSPARENCY IN ATOMIC-HYDROGEN, Physical review letters, 71(19), 1993, pp. 3099-3102
Nonlinear optical generation using electromagnetically induced transpa
rency is demonstrated with atomic hydrogen as a test medium. With the
application of a strong-coupling laser field to the 3p-2s transition,
the resonant Lyman-beta (3p-1s) transition becomes transparent. The ge
nerated-sum-frequency Lyman-beta radiation at 103 nm can continue to g
row without suffering resonant absorption and phase mismatching.