DAVLL Magnetic Cell Holder

thingiverse

Here's a mount for an Rb cell designed specifically for dichroic atomic vapor laser lock (DAVLL) and spectroscopy of gases in vapor cells. For more information on the physics behind DAVLL, check out articles such as http://iopscience.iop.org/article/10.1088/0953-4075/40/1/017/meta or other publications about this technique. The basic concept is that a magnetic field splits atomic transitions between two states, allowing for precise locking to the transition without modulating the signal and using a lock-in amplifier. This can be achieved by applying proper circularly polarized light, a beam splitter, and an absorption profile that's linear and crosses zero close to resonance. The mount is designed for use with an OD 25 mm vapor cell and features six square slots that hold 1/4" x 1/4" x 1/4" permanent rare-earth magnets. Twelve magnets are inserted into each slot, which can be secured in place using the holder or lab tape. To create an axial field, the magnets should be arranged accordingly. The DAVLL signal is visible with two, four, and six magnet stacks installed, as shown in the attached plot. The plot displays standard absorption spectra and DAVLL spectra taken with a DBR whose wavelength/frequency is swept across the spectrum. The print was made using magnetic Iron PLA to enhance the field, but it's worth noting that the enhancement isn't critical, and the same spectra can be obtained with a standard PLA print.