Graham Lochead 19/07/10 Lens setup for Rydberg spatial distribution.

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Presentation transcript:

Graham Lochead 19/07/10 Lens setup for Rydberg spatial distribution

Graham Lochead 19/07/10 Outline Spatial distribution experiment Translation stage Lens design

Graham Lochead 19/07/10 Rydberg cloud distribution 5s 2 1 S 0 5s5p 1 P 1 5sns 1 S 0 V Low density High density Rydberg blockade should alter density profile

Graham Lochead 19/07/10 Ground state distribution Measure ground state distribution from MOT floursecence Rydberg state scatters too few photons

Graham Lochead 19/07/10 Autoionization Allows independent Rydberg excitation and investigation Ion detection is very sensitive 5s 2 5s5p5sns(d)5pns(d)5s 1/2 +

Graham Lochead 19/07/10 Experiment plan Need to scan across MOT

Graham Lochead 19/07/10 Lens setup ElementFocal length Viewport Spot size ≤ 10μm Lenses outside chamber Limit decentration/tilt error Vibrationally insensitive Constraints

Graham Lochead 19/07/10 Translation stage 25mm travel Micron accuracy stepper motor Newport miniature linear translation stage MFA-PP Michelson interferometer

Graham Lochead 19/07/10 LabVIEW knife-edge program Test translation stage LabVIEW drivers Need to check waist size and focal position Stage steps → averages photodiode signal → Extracts std. dev. Fits data using error function 2 % error on waist measurement

Graham Lochead 19/07/10 Chromatic focal position shift Alignment extremely challenging on autoionization transition -use 461 fluorescence Chromatic shift important Gaussian propagation fit 408 Rayleigh range ≈ size of MOT

Graham Lochead 19/07/10 Viewport aberrations Large increase in waist size Focal position shift is achromatic Large increase in aberrations Not caused by tilt

Graham Lochead 19/07/10 Outlook Lens system fully calibrated Translation stage calibrated To do: Translation stage control in main Labview sequence Rebuild optical setup EIT lock

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