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Tuning Properties
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Power
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Introduction
Locking the 405nm master laser will of course require an atomic reference. (see here for level structure)
Setup
This transition has a weaker cross section, as described here. In order...
Can anyone tell me why "absorption" has a "p," while "absorb" has a "b"???
Back to Splitting
What to put in a personal wiki?
One answer would be my to do list:
Think about basic questions about how this experiment will work
Getting sufficient signal for in-situ imaing
Isolation of a...
We are surrounded every moment by air - a gas of nitrogen, oxygen, argon and other elements. This gas is comprised of molecules that fly around at hundreds of meters per second. Although individual...
Most of the ends of the fibres in our lab are angle polished. This is done on the input side to reduce specular reflection back into the laser, and reduce optical feedback; and on either side angle...
Purchasing procedures
There are two ways to pay for equipment:
credit card (ie, credit card)
purchase order (PO)
How do you decide which to do? In general, you want to use a purchase order when...
The construction of the chip experiment began in the summer of 2003, and by the summer of 2005, we were able to produce degenerate gases of both bosons and fermions. The links below give some...
Chip connections
(Book 13, p 33)
Wire
Contacts
Resistance ()
z-wire
H S
1.25
u-wire 1
G F
1.25
u-wire 2
U V
1.20
bar 1
P E
0.55
bar 2
L T
0.60
dimple 1
A B
4.55
dimple 2
N...
New Chip
Settings
Through the efforts of many students, including Micha, Barbara, and finally, Dylan, we have the capability of fabricating our own microelectromagnetic chips for atom trapping. The...
The UCA Archive is a 1GB RAID in a D-Link DNS-323. Use it for data backup, personal computer backup, music sharing (no one tell Joseph) and as a general archive. It lives under the desk in MP024....
Please change this page according to your needs
PI
Prof. Joseph Thywissen
Post-Doc
Dr. Jason McKeever
Dr. Karl Pilch
Graduate Students
Lattice:
Dylan Jervis —> moc.liamg|sivrej.nalyd#moc.liamg|sivrej.nalyd
Dave McKay
Chip:
Lindsay...
Intro
The Contrast Transfer Function (CTF) is a measure of contrast between adjacent objects. In theory, the CTF is described as the convolution between the point-spread function (PSF) of the...
Some information from Dave McKay how to make a good vacuum, from an e-mail on Jan 26, 2009
1)In Brian's view, Duniway and MDC are just a cheaper version of
Varian and he would not trust them for...
Now, this was taken with the Nikon ELWD 60x. I have this saved as being taken with the 1mm Corning fused silica, though i'll want to search my lab book and re-check that to make sure it makes sense...
We plan to evaporate in a magnetic trap, then an optical dipole trap. It will be an all-potassium evaporation, without sympathetic cooling, unlike for the chip experiment.
Magnetic evaporation
QT...
Settings
Evaporative cooling is the final cooling step in our experiment. We remove the hottest atoms of the ensemble using rf transitions between atomic states to leave behind a sample that is, on...
Our evaporation ramp to a 87RB BEC (16 February 2009)
Time (ms)
Final Frequency (MHz)
Power...
The Experiment
This page is intended to record "collective know-how" of the lab, including procedures, advice, data, etc.
Fibre Optics
When to choose APC and AFC
How to align the polarization to the mode axes of...
Goal
We would like to be able resolve individual atoms in a 760nm square lattice.
Approach
The diffraction limit tells us that we cannot have two point sources closer than and hope to resolve...
Basics
If you are allowed to edit pages in this Site, simply click on edit button at the bottom of the page. This will open an editor.
To create a link to a new page, use syntax: [[[new page...
Settings
Back to Chip Experiment
+/-15V DC Lab Power Supply
Useful to power small circuits around the lab.
Use a 2A AC/DC converter: HCC15-3-A+G
6-pin mini din connectors:
Water Cooling
Fittings
NPT: National Pipe Thread...
Installing the Printer Driver on Macs and PCs
Posted on the wall in MP025 as well. Originally written by Alan & Marcius.
To configure router, to to http://192.168.1.1 on any machine. User:...
Installing the Printer Driver on Macs and PCs
Posted on the wall in MP025 as well. Originally written by Alan & Marcius.
To configure router, to to http://192.168.1.1 on any machine. User:...
Who can join?
Thywissen Lab group members and anyone else who would like to contribute ideas and advice….
Join!
So you want to become a member of this site? Tell us why and apply now!
Or, if you...
Installing the Printer Driver on Macs and PCs
General
Installing the Printer driver
Connecting to UCA-atoms Archive
ADWin GUI Notes
MP 025
Taking pictures with pixelfly
MP 023
MP023 Laser Settings
MP023 AOM Settings
MP025 AOM Settings
Valves
Heaters
~Heater
~Voltage
~Temperature
Dispenser tube
cell-content
cell-content
Glass cell
85
42.5
MP025 AdWin
initial...
MOT
The Magneto-Optical Trap is the first step in this experiment. We use the combination of a magnetic field gradient provided by the quadrupole coils and six intersecting laser beams to trap and...
The elevator pitch…
The prospect of using cold neutral atoms to perform a quantum simulation of condensed matter systems has garnered much excitement in recent years. Quantum simulation...
SklogWiki a
Qwiki
See Dylan #2 pg. 84 for details of measurement.
See Feshbach Coil calculator for details of calculation.
*Probe was coarsely positioned at the center by finding the minimum field of the coils...
Summary of B-fields
MOT Anti-H
MOT transfer
x-bias
y-bias
z-bias
B-field per A, at MOT
1.56 G/cm
3.03 G
1.807 G
1.141 G
1.807 G
error (1 cm...
Magnetic trapping
Settings
This photo shows all of the magnetic trapping elements in the experiment, and looks up at the experiment at an angle (the chip we see in the centre faces down).
On the...
The magnifying objective gets rid of pixellization effects by magnifying the image 2x or 4x more. it's placed on the kohler setup. here's a diagram with dimensions. we want to place the image...
*This project was started by Josefine Metzkes and Alan Stummer in January 2008. Josefine designed the first current scheme, ordered coils and designed the system mounts. Alan took care of all the...
Manuals
Pixelfly qe
NLN Blue Magnavolt power supplies
Guides
Not so short Latex guide
Mathematica Guide
AutoCAD guide
Note: All windows were found on the Discount Overrun List at Meller optics
Fused Silica
i) Part #: SCD1525-02A
Price: $23.50
Description:
0.525"DIA. X 0.030"THK.
CONFIGURATION: DISC,...
Installing the Printer Driver on Macs and PCs
Posted on the wall in MP025 as well. Originally written by Alan & Marcius.
To configure router, to to http://192.168.1.1 on any machine. User:...
Cell
1.5in windows
Ron Bihler cell
Y-shaped source tube with 8 dispensers
Dispensers
4x Alvatec enriched 40K
2x Alvatec Rb
1x Alvatec Cs
1x Alvatec natural abundance K
note:
1) Alvatec...
Rb AOMs
Rb Trapping
MOT / Imaging (addressing F = 2 -> F' = 3)
AOM Name
AOM Frequency (MHz)
Order
Number Passes
Actual Optical Freq Shift (MHz)
AOM1 (sat. spec.)
65
+1
2
65
AOM2 (freq....
Settings as of 13 February 2009:
Master Lasers (New Focus Vortex)
Laser Name
Current (mA)
Piezo Voltage (V)
Rb Trap
90.0
54.8
Rb Repump
47.0
74.3
K Trap
50.0
66.9
K...
Light from MP023
Light is picked off from the K repump line in MP023, after it has been locked to the 39K F=2 -> 2P3/2 (unresolved), then shifted an additional ~-308MHz by AOM1 and...
This CTF was taken in late November, 2008.
Notes:
1) We measure only the CTF. The PTF plot is calculated using the measured CTF values.
2) The measured CTF values are corrected upwards to account...
The objectives we are testing are infinity focused, which means that another lens - the tube lens - is required after the objective to bring the light rays to an image.
Nikon gave us three...
Power settings for Optical Pumping:
Fibre output measured with DET 110, 50KOhm input resistance.
Measure: 13 February 2009
repump = 1.09 V "platform"
OP/trap = 104 mV 0.6 ms...
Reference
Settings
We have the capability to create an optical dipole trap near the chip. We focus two beams of 1064 nm light near the location of the atom chip trap, and we can either transfer the...
Optical dipole traps review paper: arXiv:physics/9902072
Some equations for 87Rb trapped in a single gaussian beam:
trap depth:
(1)
trap frequency:
(2)
(3)
Back to Optical Trapping
ODT AOM Power calibrations (17 August 2007; Book 10 p184)
Back to Optical Trapping
a sampling of (probably) relevant papers.
General
Simplified system for Creating a BEC (Lewandowski/Cornell)
Making, probing and Understanding Ultracold Fermi Gases (Review Article) (Ketterle,...
An attempt to organize the lab picnic through online collaboration
Time / location
Sunday, 23rd August. Centre Island.
Google Map of picnic site
Environment Canada Forecast
Jason needs to leave...
Introduction
A polarization maintaining (PM) fibre is one in which the two lowest modes have orthogonal linear polarizations. This is created by breaking the rotational symmetry of the index, as...
Lindsay's Posters and Talks
E-beam training
Notes #1
Notes #2
Notes #3
Absence of a Direct Superfluid to Mott Insulator Transition in Disordered Bose Systems
Manuals
Where to buy equipment
Lab Miscellany
How we test an objective
Ideally, in testing whether or not an objective would be able to resolve atoms in a close-spacing lattice, we would like to have a substrate with nanometer-sized holes...
Imaging Settings
Radial Camera
Long time of flight (fringes position)
TOF = 20 ms
Camera: 4.97 mm
Imaging System: 2.38 * 0.1"
Probe: Knob with blue wire at 1:00 (turn...
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Reference
Background
Once we've created a quantum degenerate gas of atoms, we have the ability to dynamically deform the potential these atoms see. By applying resonant radio-frequency (rf)...
Fringe spacing formula (87Rb):
(1)
Measurement of fringe spacing vs. dressing frequency
trap bottom = 773.0 kHz
Calculations of fringe spacing vs. detuning, various models
Joseph's...
Video mode
In video mode, the camera runs off C++ program, giving ~10Hz pictures.
To open:
C:\PixelFly\Demo Project\Release\pccdemo.exe
->file->continuous picture 1….that should start...
page 83 of Dylan #2
done with 4-point measurement
Joseph's list of theses
Innsbruck Group Theses
Ketterle Group theses
JILA group theses
Dan Stamper-Kurn group theses
Sengstock Group Theses
Christoph Becker (Sengstock group)
Martin Zwierlein...
Motivation
An introduction that assumes nothing
Lattice introduction
Chip introduction
Why this wiki?
Lattice Experiment
Vacuum System
High-Resolution Imaging
MOT
Evaporation
405nm Sat....
Reason for a transport system?
Atoms need to be shuffled from the glass MOT chamber (at ~10-9 torr) to the much higher vacuum steel lattice chamber (at 10-11-10-12 torr) in order to increase the...
Vacuum system design
We require atoms to be captured into a MOT out of a vapour at approximately 10-8 torr. However, because we need a longer trapping lifetime than a vacuum pressure at 10-8 torr...
According to Wikipedia, the world largest wiki site:
A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to add, remove, or otherwise edit...
Seed Magazine profile of John Wilbanks
Michael Nielsen's manifesto
On Dialogue
Wikipedia or perish
Notes:
1) We measure only the CTF. The PTF plot is calculated using the measured CTF values.
2) The measured CTF values are corrected upwards to account for pixellization effects of the...
No Window
unmagnified Dec 17 2008
unmagnified Jan 14 2009
The objectives we are testing are infinity focused, which means that another lens - the tube lens - is required after the objective to bring the light rays to an image. The positioning of the tube...
