Efficient continuous resonant frequency mixing ω₄ = ω₁ - ω₂ + ω₃ in Na₂ has been realized. A bichromatic field (λ₁ = 488 nm, λ₂ = 525 nm), generated by an Ar⁺-laser-pumped Na₂ Raman laser, and radiation at λ₃ = 655 nm from a dye laser interact resonantly with corresponding transitions X¹Σ_g⁺(υ = 3, J = 43) → B¹Π_u(6, 43) → X¹Σ_g⁺(13, 43) → A¹Σ_g⁺(24, 44) in a test Na₂ heat pipe. For input powers of 200, 25, and 400 mW an output beam of as much as 0.2 mW at λ₄ = 599 nm has been observed. Measured parameter dependences indicate an influence of interference effects. This is directly related to the discussion of lasing without inversion.

© 1996 Optical Society of America

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