arxiv:1104.3177 optical pulse-shaping for internal cooling of molecules optical pulse-shaping for...
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arXiv:1104.3177
Optical pulse-shaping for internal cooling of molecules
Chien-Yu Lien, Scott Williams, and Brian Odom
Department of Physics and Astronomy, Northwestern University
International Symposium on Molecular Spectroscopy66th Meeting
2011.06.24
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Applications:
• Molecular clock
• Test on fundamental constant
• Quantum computation
• Cold chemistry
.
.
Internal Cooling !?
-> Prepare molecules in desired low energy states
Methods:
• Buffer gas cooling
• Supersonic expansion
• Stark deceleration
• Optical pumping
.
.
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What about rotational degree of freedom
M. Viteau et al, Science, 2008, 321, 232–234.
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Achieve rotational cooling in 10s of seconds
P. F. Staanum et al., Nature Physics, 2010, 6, 271–274. T. Schneider et al., Nature Physics, 2010, 6, 275–278.
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Apparatus – RF Paul trap
pulse valve
source chamber
exp. chamber
AlH+
r0 = 3 mmz0=15mmΩrf = 2MHz
Internal degrees of freedom are not cooled!
Ba+
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v” = 0
v” = 2
v” = 1
v’ = 0
v’ = 1
1500 cm-1
300 K ~ 200 cm-1
Diagonal Frank-Condon factors of AlH+
AlH+
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Rotational optical pumping in AlH+
K’ J’ 3 2.5
2 1.5
1 0.5
K” J”3
2
1
0
2.51.5
1.50.5
0.5
P−+
+−
−+
++
−−
+
−−
3.52.5
pumping decay
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MirrorGrating
Mask
Mirror
Concave Mirror
Pulse shaping
Pillet’s group cooled the vibrational DOF with this technique
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Better than the required 10 cm-1 for cooling AlH+
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Data
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PROC (Pulse-shaped Rotational Optical Cooling)
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Rate Equation Simulation
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1 + 1’ REMPD state readout
M. F. Guest and D. M. Hlrst, Chemical Physics Letters, 1981, 84, 167.P. J. Bruna and F. Grein, Physical Chemistry Chemical Physics, 2003, 5, 3140.
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Conclusions
• This scheme cools internal DOF in 10μs compared to 10s of seconds
• Complementary to the work of Drewsen and Schiller’s groups
• Advantage of choosing AlH+ :
• Diagonal FCFs
• Simple pulse-shaping
• Extension to other molecules:
• A second fs laser to repump v” > 0 population
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Current Progress
• Pulse-shaped laser ready
• AlH sample generation ready
• Ion trap ready
• Vacuum system ready
• Next: start trapping!
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More info.-- arXiv:1104.3177
Acknowledgement
Thanks to:
• Prof. Brian Odom
• Scott Williams – laser spectrum
• Dr. Jason Nguyen – simulation
• Chris Seck
• And your attention!!
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Addition slides in the back
http://www.zazzle.com/geeksgetit
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