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Opt Express. 2008 Sep 29;16(20):15923-31.

Quasi-phase-matching and dispersion characterization of harmonic generation in the perturbative regime using counterpropagating beams.

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  • 1Department of Physics and JILA, University of Colorado at Boulder and NIST, Boulder, Colorado 80309, USA.


It is shown theoretically that second harmonic generation can be quasi-phase-matched by using a pump beam consisting of a forward propagating field and a counterpropagating pulse train. The counterpropagating setup can also be used for direct measurement of the coherence length of the nonlinear process which can determine the dispersion properties of the medium.

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