We present here the quasi-phase-matched second-harmonic (SH) light of holographic all-optical poling measured along the off-axis direction of the wave vector of $4{\mathbf{k}}_{\omega }-{\mathbf{k}}_{2\omega }+\mathrm{\Delta }\mathbf{k}$ with $\mathrm{\Delta }\mathbf{k}=0$ , where ${\mathbf{k}}_{\omega }$ is the wave vector of ω writing beam, ${\mathbf{k}}_{2\omega }$ is the wave vector of $2\omega$ writing beam, and $\mathrm{\Delta }\mathbf{k}$ is the wave-vector mismatch whose vector is parallel to ${\mathbf{k}}_{\omega }$ . As expected, $\mathrm{\Delta }\mathbf{k}\ne 0$ of the phase-mismatched condition gave rise to a very low SH signal. Furthermore, tensor components of ${\chi }^{(2)}$ gratings were analyzed, and the contribution of the photoisomeric state of the cis configuration of azobenzene chromophore studied was discussed.

© 2011 Optical Society of America

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