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Excitation control of a cold strontium Rydberg gas

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Presentation on theme: "Excitation control of a cold strontium Rydberg gas"— Presentation transcript:

1 Excitation control of a cold strontium Rydberg gas
Graham Lochead, 12/12/11

2 Team strontium Matt Jones Charles Adams Me Danielle Boddy Dan Sadler
Christophe Vaillant Graham Lochead, 12/12/11

3 Rydberg physics Rydberg atoms: States of high principal n
Strong, tunable interactions Ground state Excited state Column density Position Graham Lochead, 12/12/11

4 Spatial autoionization
5pns(d) λ3 = 408 nm 5s Sr+ 5sns(d) λ2 = 413 nm 5s5p λ1 = 461 nm 5s2 Graham Lochead, 12/12/11

5 Rydberg transition saturation
Outline Quantization axis Focused coupling beam Rydberg transition saturation Graham Lochead, 12/12/11

6 Experimental procedure
~106 atoms at 5 mK Camera image for atom number 408 is focused to 10 μm Translation stage / probe …frequency stepped Ions detected on an MCP Probe + Coupling (1 μs) 408 pulse (1 μs) Electric field pulse (5 μs) MOT + Zeeman MOT + Zeeman Time Repeat Graham Lochead, 12/12/11

7 States degenerate – can’t select
Quantization axis mJ = -2 -1 +1 +2 J = 2 J = 1 J = 0 States degenerate – can’t select Stray field broadens spectrum Graham Lochead, 12/12/11

8 Magnetic field splits degeneracy
Quantization field Magnetic field splits degeneracy Stretched states strongest coupled Can select mJ state Förster zeros avoided Graham Lochead, 12/12/11

9 Swtich as fast as possible Eddy currents a problem
Field switch on Need to switch field on Swtich as fast as possible Eddy currents a problem Graham Lochead, 12/12/11

10 Focusing coupling laser
Unaddressed Rydberg atoms Why? 1D geometry Better internuclear projection Graham Lochead, 12/12/11

11 Focused coupling laser
Similar lens setup to autoionizing laser Translate 408 to find focus Graham Lochead, 12/12/11

12 Large increase in Rabi frequency
“Saturation” effect Large increase in Rabi frequency “Saturation” seen in amplitude Not Coulomb blockade as no shift 3-level OBE theory incorrect Graham Lochead, 12/12/11

13 Can excite specific mJ states
Summary Can excite specific mJ states Focused coupling laser Saturation effect to investigate Graham Lochead, 12/12/11

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