2016/01/31 by A. Rakhman, M. Hafez, S. Nanda +13 · 1 citation
Physics and Astronomy · #nucl-ex #physics.ins-det
paper · pdf · doi:10.1016/j.nima.2016.03.085
20 pages, 22 figures, revised version of arXiv:1601.00251v1, submitted to NIMA
arxiv created 2016/03/29 · arxiv updated 2016/03/30
A high-finesse Fabry-Perot cavity with a frequency-doubled continuous wave green laser (532~nm) has been built and installed in Hall A of Jefferson Lab for high precision Compton polarimetry. The infrared (1064~nm) beam from a ytterbium-doped fiber amplifier seeded by a Nd:YAG nonplanar ring oscillator laser is frequency doubled in a single-pass periodically poled MgO:LiNbO3 crystal. The maximum achieved green power at 5 W IR pump power is 1.74 W with a total conversion efficiency of 34.8%. The green beam is injected into the optical resonant cavity and enhanced up to 3.7~kW with a corresponding enhancement of 3800. The polarization transfer function has been measured in order to determine the intra-cavity circular laser polarization within a measurement uncertainty of 0.7%. The PREx experiment at Jefferson Lab used this system for the first time and achieved 1.0% precision in polarization measurements of an electron beam with energy and current of 1.0~GeV and 50~μA.