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Progress towards Rydberg spatial distribution

Progress towards Rydberg spatial distribution. Team strontium. Matt Jones. James Millen. Danielle Boddy. Our paper “ T wo-electron excitation of an interacting cold Rydberg gas ” accepted into PRL. Outline. Rydberg spatial distribution FM spectroscopy MT spectroscopy EIT spectroscopy.

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Progress towards Rydberg spatial distribution

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  1. Progress towardsRydberg spatial distribution Graham Lochead 25/10/10

  2. Team strontium Graham Lochead 25/10/10 Matt Jones James Millen Danielle Boddy Our paper “Two-electron excitation of an interacting cold Rydberg gas” accepted into PRL

  3. Outline Graham Lochead 25/10/10 • Rydberg spatial distribution • FM spectroscopy • MT spectroscopy • EIT spectroscopy

  4. Rydberg spatial distribution Graham Lochead 25/10/10 Ground state Rydberg state V Density (arb. units) High density Low density Distance (microns)

  5. Experimental procedure Graham Lochead 25/10/10 Automatic translation stage Lens setup

  6. Autoionization Graham Lochead 25/10/10 • Allows independent Rydberg excitation and investigation • Ion detection is very sensitive 5s2 5s5p 5sns(d) 5pns(d) 5s1/2+

  7. Progress towards experiment Graham Lochead 25/10/10  Translation stage testing  Lens design and testing  Incorporation with main LabVIEW program  Laser locking

  8. Graham Lochead 03/06/09 Laser frequency stabilization “locking” Laser locking requires an atomic sample to investigate the transition And a detection scheme that gives a slope to lock to

  9. Laser locking Graham Lochead 25/10/10 Need to lock coupling laser (5s5p → 5sns(d)) – previously stepped Previously used polarization spectroscopy for 5s2 → 5s5p transition C. Javaux et. al, Eur. Phys. J. D. 151-154 (2010) Switch to modulation spectroscopy Frequency (MHz)

  10. FM spectroscopy Graham Lochead 25/10/10 G.C. Bjorklund et. al, Appl. Phys. B 32, 145-152 (1983) EOM Cell PS Filter 9.45 MHz Oscilloscope

  11. Sub-Doppler FM spectroscopy Graham Lochead 25/10/10 EOM Cell

  12. MT spectroscopy Graham Lochead 25/10/10 D.J. McCarron et. al, Meas. Sci. Technol. 19, 105601 (2008) Cell EOM

  13. EIT spectroscopy Graham Lochead 25/10/10 R.P. Abel et. al, Appl. Phys. Lett. 94, 071107 (2009) Cell EOM 5s56d

  14. On-resonance / off-resonance • Initially do on-resonant excitation • Will blockade be seen? • Switch to off-resonant excitation if no blockade

  15. Outlook Graham Lochead 25/10/10 • Finish characterizing lock signals • Test new fast photodiodes • Finalize optical setup

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