A high-finesse Fabry-Perot cavity with a frequency-doubled green laser for precision Compton polarimetry at Jefferson Lab

DOI

10.1016/j.nima.2016.03.085

Authors

A. Rakhman, Syracuse University
M. Hafez, Old Dominion University
S. Nanda, Thomas Jefferson National Accelerator Facility
F. Benmokhtar, Carnegie Mellon University
A. Camsonne, Thomas Jefferson National Accelerator Facility
G. D. Cates, University of Virginia
M. M. Dalton, Thomas Jefferson National Accelerator Facility
G. B. Franklin, Carnegie Mellon University
M. Friend, Carnegie Mellon University
R. W. Michaels, Thomas Jefferson National Accelerator Facility
V. Nelyubin, University of Virginia
D. S. Parno, Carnegie Mellon University
K. D. Paschke, University of Virginia
B. P. Quinn, Carnegie Mellon University
P. A. Souder, Syracuse University
W. A. Tobias, University of Virginia

Document Type

Journal Article

Publication Date

6-21-2016

Publication Title

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume

822

First Page

82

Last Page

96

ISSN

1689002

Keywords

Compton polarimetry, Fabry-Perot cavity, Laser polarization, Polarized electron beam

Abstract

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 infrared 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 1.06 GeV and 50 μA.

Open Access

Green Accepted

Preprint

Link to Author Manuscript

Repository Citation

Rakhman, A., Hafez, M., Nanda, S., Benmokhtar, F., Camsonne, A., Cates, G., Dalton, M., Franklin, G., Friend, M., Michaels, R., Nelyubin, V., Parno, D., Paschke, K., Quinn, B., Souder, P., & Tobias, W. (2016). A high-finesse Fabry-Perot cavity with a frequency-doubled green laser for precision Compton polarimetry at Jefferson Lab. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 822, 82-96. https://doi.org/10.1016/j.nima.2016.03.085