Abstract
The utilization of polarized targets in scattering experiments has become a common practice in many major accelerator laboratories. Noble gases are especially suitable for such applications, since they can be easily hyper-polarized using spin exchange or metastable pumping techniques. Polarized helium-3 is a very popular target because it often serves as an effective polarized neutron due to its simple nuclear structure. A favorite cell material to generate and store polarized helium-3 is GE-180, a relatively dense aluminosilicate glass. In this paper, we present a Faraday rotation method, using a new triple modulation technique, where the measurement of the Verdet constants of SF57 flint glass, pyrex glass, and air was tested. The sensitivity obtained shows that this technique may be implemented in future cell wall characterization and thickness measurements. We also discuss the first ever extraction of the Verdet constant of GE-180 glass for four wavelength values of 632 nm, 773 nm, 1500 nm, and 1547 nm, whereupon the expected 1/λ(2) dependence was observed.
Highlights
The study of spin interactions in scattering experiments has become a major part of modern accelerator laboratories.The improvements on polarized noble gas targets, especially the generation of hyper-polarized helium-3, over the last few decades have been impressive
We present a Faraday rotation method, using a new triple modulation technique, where the measurement of the Verdet constants of SF57 flint glass, pyrex glass, and air was tested
The light goes through the polarization state analyzer, which is comprised of a photoelastic modulator (PEM) and second linear polarizer with transmission axis at 45◦ with respect to both the optical axis of the PEM and transmission axis of the first polarizer
Summary
The study of spin interactions in scattering experiments has become a major part of modern accelerator laboratories. Faraday showed that linearly polarized light would undergo a rotation of the plane of polarization upon being transmitted through a medium that has a magnetic field applied along the direction of propagation. The Faraday effect description reflected Becquerel’s derived classical expression for the Verdet constant, V = (eλ/2mc)dn/dλ, which shows that V is proportional to the dispersion, dn/dλ.. The Faraday effect description reflected Becquerel’s derived classical expression for the Verdet constant, V = (eλ/2mc)dn/dλ, which shows that V is proportional to the dispersion, dn/dλ.8 This describes a change in the index of refraction for lefthanded versus right-handed circularly polarized light as a function of wavelength, where in the long wavelength regime, the behavior of V scales as 1/λ2
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