Production of highly polarized 3He using spectrally narrowed diode laser array bars

Autor:	T. B. Smith, Alan K. Thompson, E Babcock, Thomas R. Gentile, B. Chann, W. C. Chen, Thad Walker, L. W. Anderson
Rok vydání:	2003
Předmět:	Chemistry business.industry General Physics and Astronomy chemistry.chemical_element Polarization (waves) Laser law.invention Optical pumping Optics law Helium-3 Neutron Laser power scaling business Helium Diode
Zdroj:	Journal of Applied Physics. 94:6908-6914
ISSN:	1089-7550 0021-8979
Popis:	We have produced 70%–75% 3He polarization by spin-exchange optical pumping in cells ≈100 cm3 in volume. The polarization achieved is consistent with known spin-exchange and spin-relaxation rates, but only when the recently discovered temperature dependence of 3He relaxation is included. Absolute 3He polarization measurements were performed using two different methods in two different laboratories. The results were obtained with either a spectrally narrowed laser or one type of broadband laser. Based on tests of several larger cells at pressures near 1 bar, we find that the power required to reach the same polarization is typically three times lower for the spectrally narrowed laser. This last result indicates that spectrally narrowed lasers will be important for obtaining the highest polarization in large volume neutron spin filters. Polarization in excess of 55% as obtained in cells up to 640 cm3 in volume and 70% polarization is anticipated with available increases in spectrally narrowed laser power.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::73f1921b21f7512f71ee615fc880e3d3 https://doi.org/10.1063/1.1621739 Zobrazit plný text záznamu