## Abstract

We measured the tilting of a femtosecond laser wave packet in a birefringent rutile crystal. The measurements were carried out with a linear interferometric technique that, in contrast to nonlinear correlation techniques, allows measurement at very low power. A 23-fs delay between the left and the right parts of a 30-fs, 800-nm wave packet with 20° divergence was measured for a 1-mm-thick rutile crystal, in agreement with theoretical predictions.

© 1997 Optical Society of America

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### Equations (1)

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(1)
$$\frac{\partial}{\partial z}A(\mathbf{x},t)=\left(-{\beta}_{1}\frac{\partial}{\partial t}-\frac{i}{2}{\beta}_{2}\frac{{\partial}^{2}}{\partial {t}^{2}}+\frac{1}{6}{\beta}_{3}\frac{{\partial}^{3}}{\partial {t}^{3}}+\dots +{\gamma}_{x}\frac{\partial}{\partial x}+{\gamma}_{y}\frac{\partial}{\partial y}-\frac{i}{2}{\gamma}_{\mathit{xx}}\frac{{\partial}^{2}}{\partial {x}^{2}}-\frac{i}{2}{\gamma}_{\mathit{yy}}\frac{{\partial}^{2}}{\partial {y}^{2}}+i{\gamma}_{\mathit{xt}}\frac{\partial}{\partial x}\frac{\partial}{\partial t}+i{\gamma}_{\mathit{yt}}\frac{\partial}{\partial y}\frac{\partial}{\partial t}+i{\gamma}_{\mathit{xy}}\frac{\partial}{\partial x}\frac{\partial}{\partial y}\dots \right)A(\mathbf{x},t).$$