An acousto-optic deflector is essentially a diffractive device, and hence the scan generated by the deflector is a function of the optical wavelength used. This has meant that for multiwavelength operation, such as colour Laser displays, separate deflectors have been used for each wavelength. The extension of their use, to include more than one wavelength, would clearly have a number of practical advantages. Described in this paper is a novel holographic method which allows the deflector to be used with more than one wavelength. Also reported is an assessment of the practicality of the method.