Frequency axis calibration and the state of affairs in Team Strontium

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Presentation transcript:

Frequency axis calibration and the state of affairs in Team Strontium James Millen Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Strontium dispenser cell Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Doppler broadened absorption profile with large FWHM of ~280MHz (?) Absorption spectra Doppler broadened absorption profile with large FWHM of ~280MHz (?) Sloping background due to laser scan Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Saturated absorption spectroscopy An intense “pump” laser depopulates the ground state for a narrow velocity class around the central frequency, limited by the width of the transition (32MHz) Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Fitting and calibration The saturated absorption feature is Lorentzian in form. Fit with a sum of six Lorentzians, one for each isotope (and hyperfine component) of strontium. We have five free parameters. Use the minimisation function “fminsearch” in MatLab to fit to the data Requires a starting set of parameters, the choice of these is not obvious. Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Further spectroscopy in the cell Clementine has been doing FM spectroscopy, sub-Doppler DAVLL and strong field polarisation spectroscopy (Hughes spec) Cell Machine Beam Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Aside- The ultra cold strontium experiment Vacuum system is fully assembled in new lab (room 34) System is aligned Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08

Aside- The ultra cold strontium experiment Strontium is loaded into the oven, and the oven is insulated The oven section is currently being baked and pumped Frequency axis calibration and the state of affairs in Team Strontium – Group meeting 28/07/08