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We have observed a complete cancellation of self-phase modulation in 1.06-μ pulses propagating through cesium vapor. The negative nonlinear refractive index responsible for this is measured as n2/N=−(2.5±0.5) ×10−30 esu, in good agreement with the theoretical value −2.62×10−30 esu.
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Lehmberg et al. (1977) studied this question.
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