New technique for the reduction of helicity-correlated instrumental asymmetries in photoemitted beams of spin-polarized electrons

J. M. Dreiling; S. J. Burtwistle; T. J. Gay

doi:10.1364/AO.54.000763

Applied Optics
Vol. 54,
Issue 4,
pp. 763-769
(2015)
•https://doi.org/10.1364/AO.54.000763

New technique for the reduction of helicity-correlated instrumental asymmetries in photoemitted beams of spin-polarized electrons

J. M. Dreiling, S. J. Burtwistle, and T. J. Gay

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J. M. Dreiling, S. J. Burtwistle, and T. J. Gay, "New technique for the reduction of helicity-correlated instrumental asymmetries in photoemitted beams of spin-polarized electrons," Appl. Opt. 54, 763-769 (2015)

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Abstract

We present a new optical system that significantly reduces helicity-dependent instrumental intensity asymmetries. It is an extension of a previous scheme [Appl. Opt. 47, 2465 (2008) [CrossRef] ], where one laser beam is split using a polarizing beam splitter into two with orthogonal linear polarizations. The beams are sent through a chopper, allowing only one to pass at a time. The two temporally separated beams are then spatially recombined using a second beam splitter. A liquid crystal retarder preceding the first beam splitter controls the relative intensity of the two oppositely polarized beams, allowing reduction of instrumental asymmetries. This system has been modified to include a spatial filter and a Pockels cell placed after the second beam splitter to act as a second active polarization element. Using this method, we can control instrumental asymmetries to $\sim 5 \times 10^{- 7}$ in 1 h of data taking, which is comparable to the precision achieved in “second-generation” high energy electron-nuclear scattering parity violation experiments.

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	Max. Drift in 60 Min (Max-Min)	4-Bin Standard Deviation Average	60 Min Standard Deviation of the Mean
PC with one beam	$3.97 \times 10^{- 3}$	$3.61 \times 10^{- 5}$
Previous system	$2.58 \times 10^{- 3}$	$7.58 \times 10^{- 4}$
Add SF	$9.60 \times 10^{- 4}$	$6.12 \times 10^{- 5}$
Replace $λ / 4$ with PC	$3.49 \times 10^{- 4}$	$3.92 \times 10^{- 5}$
PC & SF	$2.54 \times 10^{- 5}$	$7.88 \times 10^{- 5}$	$4.56 \times 10^{- 7}$
Crystal photoemission	$1.20 \times 10^{- 6}$	$2.73 \times 10^{- 5}$	$1.53 \times 10^{- 7}$
Photodiode	$1.86 \times 10^{- 6}$	$4.23 \times 10^{- 6}$	$2.63 \times 10^{- 8}$

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Applied Optics