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We demonstrate a dual wavelength acousto-optic deflector (AOD) designed todeflect two wavelengths to the same angles by driving with two RF frequencies.The AOD is designed as a beam scanner to address two-photon transitions in atwo-dimensional array of trapped neutral Rb atoms in a quantum computer.Momentum space is used to design AODs that have the same diffraction angles fortwo wavelengths (780 nm and 480 nm) and have non-overlapping Bragg-matchedfrequency response at these wavelengths, so that there will be no crosstalkwhen proportional RF frequencies are applied to diffract the two wavelengths.The appropriate crystal orientation, crystal shape, transducer size, andtransducer height are determined for an AOD made with a Tellurium dioxidecrystal (TeO2). The designed and fabricated AOD has more than 100 resolvablespots, widely separated bandshapes for the two wavelengths within an overalloctave bandwidth, spatially overlapping diffraction angles for both wavelengths(780 nm and 480 nm), and a 4 usec or less access time. Cascaded AODs in whichthe first device upshifts and the second downshifts allow Doppler-free scanningas required for addressing the narrow atomic resonance without detuning. Weexperimentally show the diffraction-limited Doppler-free scanning performanceand spatial resolution of the designed AOD.

Doppler-free, Multi-wavelength Acousto-optic deflector for two-photon addressing arrays of Rb atoms in a Quantum Information Processor