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Progress towards Rydberg spatial distribution

This study details our progress on the Rydberg spatial distribution of a cold gas, with a focus on the two-electron excitation of Strontium atoms. Our research, accepted into Physical Review Letters, includes various spectroscopic techniques such as FM, MT, and EIT spectroscopy to investigate the dynamics of Rydberg states. We outline our experimental procedures, the design of the translation stage for precise Rydberg excitation, and the development of a stable laser locking system crucial for our investigations. This work aims to enhance our understanding of Rydberg interactions and excitation pathways.

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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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