2007/11/21 by Sangtaek Kim, Robert R. Mcleod, Mark Saffman +2 · 1 citation
Physics and Astronomy · #Crystal (programming language) #Diffraction #Diffraction efficiency #Mechanical and Optical Resonators #Octave (electronics) #Optical and Acousto-Optic Technologies #Quantum optics and atomic interactions #Resolution (logic) #Resonance (particle physics) #Transducer #Wavelength #quant-ph
paper · pdf · doi:10.1364/ao.47.001816
published as Appl. Opt. 47, 1816 (2008) · 28 pages, 16 figures, submitted to Applied Optics
arxiv created 2007/11/21 · openalex publication_date 2008/04/09 · arxiv updated 2012/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We demonstrate a dual wavelength acousto-optic deflector (AOD) designed to deflect 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 a two-dimensional array of trapped neutral Rb87 atoms in a quantum computer. Momentum space is used to design AODs that have the same diffraction angles for two wavelengths (780 and 480 nm) and have nonoverlapping Bragg-matched frequency response at these wavelengths, so that there will be no cross talk when proportional frequencies are applied to diffract the two wavelengths. The appropriate crystal orientation, crystal shape, transducer size, and transducer height are determined for an AOD made with a tellurium dioxide crystal (TeO(2)). The designed and fabricated AOD has more than 100 resolvable spots, widely separated band shapes for the two wavelengths within an overall octave bandwidth, spatially overlapping diffraction angles for both wavelengths (780 and 480 nm), and a 4 micros or less access time. Cascaded AODs in which the first device upshifts and the second downshifts allow Doppler-free scanning as required for addressing the narrow atomic resonance without detuning. We experimentally show the diffraction-limited Doppler-free scanning performance and spatial resolution of the designed AOD.