Transcript Single Site Addressability in a CO2 Lattice

Progress towards
Rydberg spatial distribution
Graham Lochead 25/10/10
Team strontium
Matt Jones
James Millen
Danielle Boddy
Our paper “Two-electron excitation of an interacting
cold Rydberg gas” accepted into PRL
Graham Lochead 25/10/10
Outline
• Rydberg spatial distribution
• FM spectroscopy
• MT spectroscopy
• EIT spectroscopy
Graham Lochead 25/10/10
Rydberg spatial distribution
Ground state
Rydberg state
Density (arb. units)
V
Low
density
High
density
Distance (microns)
Graham Lochead 25/10/10
Experimental procedure
Automatic
translation stage
Lens setup
Graham Lochead 25/10/10
Autoionization
• Allows independent Rydberg
excitation and investigation
• Ion detection is very sensitive
5s2
5s5p
5sns(d)
5pns(d)
Graham Lochead 25/10/10
5s1/2+
Progress towards experiment

Translation stage testing

Lens design and testing

Incorporation with main LabVIEW program

Laser locking
Graham Lochead 25/10/10
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
Graham Lochead
03/06/09
Laser locking
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
Signal (mV)
20
0
-20
-40
-400
Frequency (MHz)
Graham Lochead 25/10/10
-200
0
200
Detuning (MHz)
400
FM spectroscopy
G.C. Bjorklund et. al, Appl. Phys. B 32, 145-152 (1983)
EOM
Cell

PS

Filter
9.45 MHz
Oscilloscope
Graham Lochead 25/10/10
Sub-Doppler FM spectroscopy
EOM
Cell
Graham Lochead 25/10/10
MT spectroscopy
D.J. McCarron et. al, Meas. Sci. Technol. 19, 105601 (2008)
Cell
EOM
Graham Lochead 25/10/10
EIT spectroscopy
R.P. Abel et. al, Appl. Phys. Lett. 94, 071107 (2009)
EOM
Cell
5s56d
Graham Lochead 25/10/10
On-resonance / off-resonance
• Initially do on-resonant excitation
– Will blockade be seen?
• Switch to off-resonant excitation if no
blockade
Outlook
• Finish characterizing lock signals
• Test new fast photodiodes
• Finalize optical setup
Graham Lochead 25/10/10