Nonlinear optical effects in absorbing fluids: some undergraduate experiments

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Abstract
While nonlinear optics has become increasingly important in theory and applications few undergraduate laboratories include nonlinear optics experiments in their program. The purpose of the paper is to describe a few simple experiments and their theoretical interpretations at the senior undergraduate level. Liquids containing traces of absorbing dyes were used as the nonlinear media. Nonlinear effects such as self-diffraction and phase conjugation were observed with laser power as low as 100 mW.

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