## Abstract

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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