Presentation on theme: "Matter wave interferomery with poorly collimated beams"— Presentation transcript:
1 Matter wave interferomery with poorly collimated beams x [µm]x [µm]Ben McMorran, Alex CroninDepartment of Physics
2 main ideacan get matter wave interference fringes with uncollimated beams but:grating position mattersspatial coherence mattersbeam divergence mattersgrating alignment matterswe’ve got a way to model this
3 outline 1. partial coherence in grating interferometers 2. examples of grating matter wave interferometersMach-Zehnder atom interferometerTalbot-Lau C60 interferometerLau electron interferometer3. grating alignment sensitivity4. ideas for g measurement using uncollimated beam
6 partially coherent optical field complex degree of coherence µ(x)intensity I(x)
7 A Model for Partial Coherence and Wavefront Curvature in Grating Interferometers PRA (June 2008)… We simulate(1) the Talbot effect,(2) far-field diffraction,(3) Mach Zehnder interferometers(4) Talbot-Lau Interferometers(5) Lau interferometers …
17 Atom InterferometerObjective: Pioneer new techniques using matter-wave interference to make precision measurements.• Study quantum decoherence,Matter-wave index of refraction,Atomic polarizability.Approach: 3 nano-fabricated diffraction gratings.• Mach-Zhender interferometer foratom-waves..Interferometer Performance:• Up to 50% contrast.Small phase drift (< 2 rad / hr).• Layout is easily changed fornew experiments.Macroscopic (100 mm) path separation.These are the notes that explain the vugraph. Please note that these vugraphs are much more generic and less technical than yours will be. But at the same time, realize that you can’t get too technical in a single vugraph.
43 NEEDS FURTHER STUDY WITH REALISTIC PARAMETERS position echo interferometer?NEEDS FURTHER STUDY WITH REALISTIC PARAMETERS
44 matter wave fringes can be formed with uncollimated beams conclusionsimulations + experiments:matter wave fringes can be formed with uncollimated beamsnecessary to think about partial coherenceless coherence parallel to slits contrast sensitive to grating misalignmentposition echo behind 2 gratings useful for measure g?we have a tool to model this
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