Abstract

We report an investigation of the dependence on transition dipole moment of isolated line intensities in degenerate four-wave mixing in the A²Σ⁺ (υ′ = 0) ← X²Π (υ″ = 0) band for NO. For spectrally integrated intensities we found that the dependence was well described by a power law μ^x, where μ is the one-photon transition dipole moment. As a result of saturation, the exponent x depends on laser intensity. The observations are in reasonable agreement with a simple two-level model [ Opt. Lett. 294 ( 1978); Opt. Lett. 3, 205 ( 1978)], which predicts limiting dependences of μ⁸ and μ³ for low and high intensities, respectively. At intermediate laser intensities the model is consistent with an observed rapid decrease in the exponent with increasing laser intensity, followed by a plateau extending to high intensities.

© 1992 Optical Society of America

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