Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session F01: Poster Session I (4:00pm-6:00pm PT)
4:00 PM,
Tuesday, June 6, 2023
Room: Exhibit Hall C
Abstract: F01.00124 : Optical Pumping for Beta-decay Neutrino Helicity Tests*
Presenter:
Hannah Gallop
(U. Waterloo; TRIUMF)
Authors:
John A Behr
(TRIUMF; U. British Columbia)
Hannah Gallop
(U. Waterloo; TRIUMF)
Melisa Ozen
(U. Ottawa; TRIUMF)
Felix Klose
(U. British Columbia; TRIUMF)
We've improved diagnostics by replacing an absorptive polarizer with a plate beamsplitter polarizer. Characterization of the plate beamsplitter polarizer showed similar behavior in both directions on the transmitted beam: this allows us to extract the light from two counterpropagating beams after they optically pump the atoms.
We also characterized and implemented fiber-coupled electro-optic modulators to add frequency sidebands onto the optical pumping lasers. This improves reliability over direct RF pumping of the laser diode, which creates frequency mode instability in an external cavity and complicates the number of Doppler-free peaks in saturation spectroscopy.
For the analysis of the nuclear polarization of the trapped atoms, we adapted a scheme for estimating the polarization [D.G. Roberge, ``Polarization diagnostics for rubidium-80...'' M.Sc. thesis, U. British Columbia, 2006 https://open.library.ubc.ca/soa/cIRcle/collections/ubctheses/831/items/1.0099864] of 41K based on time dependence of atomic excitation after the start of optical pumping.
*Support from NSERC, RBC Foundation, and NRC through TRIUMF.
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