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<div class="grid-col-auto padding-left-1">
|
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<button class="usa-menu-btn">Menu</button>
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</div>
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<nav aria-label="Primary navigation" class="usa-nav">
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<div class="usa-nav__inner">
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<button class="usa-nav__close">Close</button>
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<ul class="usa-nav__primary usa-accordion">
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<a class="usa-nav__link" href="/publications">Publications</a>
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-2"><span>What We Do</span></button>
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<li class="usa-nav__submenu-item">
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<a href="/topics" class="usa-nav__link">All Topics</a>
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<a href="/advanced-communications" class="usa-nav__link">Advanced communications</a>
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<a href="/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a>
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<a href="/bioscience" class="usa-nav__link">Bioscience</a>
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<a href="/buildings-construction" class="usa-nav__link">Buildings and construction</a>
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<a href="/chemistry" class="usa-nav__link">Chemistry</a>
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<a href="/energy" class="usa-nav__link">Energy</a>
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<a href="/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a>
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<a href="/metrology" class="usa-nav__link">Metrology</a>
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<a href="/nanotechnology" class="usa-nav__link">Nanotechnology</a>
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<a href="/neutron-research" class="usa-nav__link">Neutron research</a>
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<a href="/performance-excellence" class="usa-nav__link">Performance excellence</a>
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<a href="/physics" class="usa-nav__link">Physics</a>
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<a href="/public-safety" class="usa-nav__link">Public safety</a>
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<a href="/quantum-information-science" class="usa-nav__link">Quantum information science</a>
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<a href="/resilience" class="usa-nav__link">Resilience</a>
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<li class="usa-nav__submenu-item">
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<a href="/standards" class="usa-nav__link">Standards</a>
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<li class="usa-nav__submenu-item">
|
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<a href="/transportation" class="usa-nav__link">Transportation</a>
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</ul>
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</div>
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</div>
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</div>
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</li>
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<li class="usa-nav__primary-item">
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs & Major Programs</span></button>
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<div class="grid-row">
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<li class="usa-nav__submenu-item">
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<a href="/adlp" class="usa-nav__link">Assoc Director of Laboratory Programs</a>
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<li class="usa-nav__submenu-item">
|
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<a href="/laboratories" class="usa-nav__link">Laboratories</a>
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<ul class="usa-nav__submenu-list">
|
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<li>
|
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<a href="/ctl" class="usa-nav__link">Communications Technology Laboratory</a>
|
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|
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<li>
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<a href="/el" class="usa-nav__link">Engineering Laboratory</a>
|
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</li>
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<li>
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<a href="/itl" class="usa-nav__link">Information Technology Laboratory</a>
|
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</li>
|
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<li>
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<a href="/mml" class="usa-nav__link">Material Measurement Laboratory</a>
|
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|
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</li>
|
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<li>
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<a href="/pml" class="usa-nav__link">Physical Measurement Laboratory</a>
|
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</li>
|
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</ul>
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</li>
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
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<li class="usa-nav__submenu-item">
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<a href="/user-facilities" class="usa-nav__link">User Facilities</a>
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<ul class="usa-nav__submenu-list">
|
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<li>
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<a href="/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a>
|
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|
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</li>
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<li>
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<a href="/cnst" class="usa-nav__link">CNST NanoFab</a>
|
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</ul>
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<li class="usa-nav__submenu-item">
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<a href="/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a>
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<li class="usa-nav__submenu-item">
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<a href="/laboratories/projects-programs" class="usa-nav__link">Research Projects</a>
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<a href="/laboratories/tools-instruments" class="usa-nav__link">Tools & Instruments</a>
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
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<a href="/major-programs" class="usa-nav__link">Major Programs</a>
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<ul class="usa-nav__submenu-list">
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<li>
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<a href="/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a>
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<li>
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<a href="/chips" class="usa-nav__link">CHIPS for America Initiative</a>
|
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</li>
|
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<li>
|
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<a href="/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a>
|
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|
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</li>
|
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<li>
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<a href="/oam" class="usa-nav__link">Office of Advanced Manufacturing</a>
|
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</li>
|
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<li>
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<a href="/spo" class="usa-nav__link">Special Programs Office</a>
|
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</li>
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<li>
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<a href="/tpo" class="usa-nav__link">Technology Partnerships Office</a>
|
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</li>
|
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|
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</ul>
|
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</li>
|
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</ul>
|
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</div>
|
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</div>
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</div>
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</li>
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<li class="usa-nav__primary-item">
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-4"><span>Services & Resources</span></button>
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<li class="usa-nav__submenu-item">
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<a href="/content/standards-measurements" class="usa-nav__link">Standards and Measurements</a>
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<ul class="usa-nav__submenu-list">
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<li>
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<a href="/calibrations" class="usa-nav__link">Calibration Services</a>
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<li>
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<a href="/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a>
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<li>
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<a href="/nist-quality-system" class="usa-nav__link">Quality System</a>
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<li>
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<a href="/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a>
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<li>
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<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
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<li>
|
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<a href="/standardsgov" class="usa-nav__link">Standards.gov</a>
|
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</li>
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<li>
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<a href="/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a>
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<li>
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<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
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<a href="/services-resources/software" class="usa-nav__link">Software</a>
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<a href="/data" class="usa-nav__link">Data</a>
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<ul class="usa-nav__submenu-list">
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<li>
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<a href="https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a>
|
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</li>
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<li>
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<a href="https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a>
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<a href="/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a>
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<a href="/srd" class="usa-nav__link">Standard Reference Data (SRD)</a>
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<a href="https://shop.nist.gov/" class="usa-nav__link">Storefront</a>
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<a href="/tpo" class="usa-nav__link">License & Patents</a>
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<a href="https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a>
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<a href="/nist-research-library" class="usa-nav__link">NIST Research Library</a>
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</ul>
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</div>
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</div>
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<li class="usa-nav__primary-item">
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News & Events</span></button>
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<div class="grid-row">
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<li class="usa-nav__submenu-item">
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<a href="/news-events/news" class="usa-nav__link">News</a>
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<a href="/news-events/events" class="usa-nav__link">Events</a>
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<li class="usa-nav__submenu-item">
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<a href="/blogs" class="usa-nav__link">Blogs</a>
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<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
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<a href="/awards" class="usa-nav__link">Awards</a>
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<a href="/video-gallery" class="usa-nav__link">Video Gallery</a>
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<a href="/image-gallery" class="usa-nav__link">Image Gallery</a>
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<a href="/pao/media-contacts" class="usa-nav__link">Media Contacts</a>
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<h1 class="nist-page__title">On the limits of spin-exchange optical pumping of 3He</h1>
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<div class="nist-field__item"><time datetime="2014-07-02T12:00:00Z">July 2, 2014</time>
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<div class="nist-field__item"><span class="nist-author">Thomas R. Gentile</span>, T G. Walker, E Babcock, <span class="nist-author"> Qiang NMN Ye</span>, <span class="nist-author">Wangchun Chen</span></div>
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<h3>Abstract</h3>
|
|||
|
|
Using diode bar lasers spectrally narrowed with chirped volume holographic gratings (VHGs), we have obtained an improvement in the 3He polarization achievable by spin-exchange optical pumping (SEOP). As compared to our past results with lasers narrowed with diffraction gratings, we have observed between 5 % and 11 % fractional increase in the 3He polarization. These results were primarily observed in large cells but we also report higher polarization in small cells, in particular one flat-windowed cell in which prior extensive studies indicated that the alkali-metal polarization was within 3 % of unity. We conclude that the most likely explanation for the improvement in 3He polarization is increased alkali-metal polarization, which has impact on understanding the maximum 3He polarization achievable by SEOP. The maximum polarization we have observed is P_ He=0.85 in a neutron spin filter cell nearly 1 liter in volume.
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<div class="nist-field__label">Citation</div>
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<div class="nist-field__item">Physical Review A</div>
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<div class="nist-field__item"><a href="https://doi.org/10.1063/1.4886583" target="_blank">DOI Link</a></div>
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<h3 class="nist-field__label">Keywords</h3>
|
|||
|
|
<div class="nist-field__item">He3, laser, optical pumping</div>
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>Citation</h2>
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<div class="js-view-dom-id-7d6548632168963eb48cd5b42b21e0b07321c8e9f8856205609ae85cb58be7e4">
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<article class="bibcite-reference">
|
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|
|||
|
|
Gentile, T.
|
|||
|
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, Walker, T.
|
|||
|
|
, Babcock, E.
|
|||
|
|
, , Q.
|
|||
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|
and Chen, W.
|
|||
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|
|||
|
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(2014),
|
|||
|
|
On the limits of spin-exchange optical pumping of 3He, Physical Review A, [online], https://doi.org/10.1063/1.4886583
|
|||
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(Accessed March 4, 2025)
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<li><a href="http://dx.doi.org/https://doi.org/10.1063/1.4886583">DOI</a></li>
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If you have any questions about this publication or are having problems accessing it, please contact <a href="mailto:reflib@nist.gov" class="usa-link">reflib@nist.gov</a>.
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Created July 2, 2014, Updated November 10, 2018
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