{"id":520,"date":"2019-10-25T16:04:00","date_gmt":"2019-10-25T14:04:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=520"},"modified":"2025-10-28T13:40:51","modified_gmt":"2025-10-28T12:40:51","slug":"shelving-spectroscopy-of-the-strontium-intercombination-line","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2019\/10\/25\/shelving-spectroscopy-of-the-strontium-intercombination-line\/","title":{"rendered":"Shelving spectroscopy of the strontium intercombination line"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p>As in the similar setting of calcium beam clocks, this enhances dramatically the signal strength as compared to direct saturated fluorescence or absorption spectroscopy of the narrow line. We implement shelving spectroscopy both in directed atomic beams and hot vapor cells with isotropic atomic velocities. We measure a fractional frequency instability \u223c2&nbsp;\u00d7&nbsp;10<sup>\u221212<\/sup> at 1s limited by technical noise\u2014about one order of magnitude above shot noise limitations for our experimental parameters.<\/p>\n\n\n\n<p>Our work illustrates the robustness and flexibility of a scheme that can be very easily implemented in the reference cells or ovens of most existing strontium experiments, and may find applications for low-complexity clocks.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image aligncenter size-full has-custom-border is-style-rounded wp-duotone-unset-1\" id=\"wp-block-themeisle-blocks-image-1fd64d66\" style=\"margin-top:var(--wp--preset--spacing--20);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);margin-left:var(--wp--preset--spacing--20)\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/10\/Shelving-spectroscopy-dca04b.svg\" alt=\"\" class=\"wp-image-828\" style=\"border-style:none;border-width:0px;border-radius:10px\"\/><figcaption class=\"wp-element-caption\">Principle of our new shelving spectroscopy scheme.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>We present a spectroscopy scheme for the 7 kHz wide 689 nm intercombination line of strontium. We rely on shelving detection, where electrons are first excited to a metastable state by the spectroscopy laser before their state is probed using the broad transition at 461 nm.<br \/>\n<a href=\"https:\/\/doi.org\/10.48550\/arXiv.1910.11718\">arXiv:1910.11718 (2019)<\/a>  \/  <a href=\"https:\/\/doi.org\/10.1088\/1361-6455\/ab707f\">J. Phys. B: At. Mol. Opt. Phys. 53 085005 (2020)<\/a><\/p>\n","protected":false},"author":3,"featured_media":828,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18,65],"tags":[119,26,125,121,31,115,113,127,36,46,120],"class_list":["post-520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-strontium","tag-anais-molineri","tag-bruno-laburthe-tolra","tag-c-duval","tag-clemence-briosne-frejaville","tag-etienne-marechal","tag-fabrice-wiotte","tag-isam-manai","tag-marc-cheneau","tag-martin-robert-de-saint-vincent","tag-pierre-bataille","tag-romaric-journet"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Shelving spectroscopy of the strontium intercombination line - Magnetic Quantum Gases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2019\/10\/25\/shelving-spectroscopy-of-the-strontium-intercombination-line\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Shelving spectroscopy of the strontium intercombination line - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"We present a spectroscopy scheme for the 7 kHz wide 689 nm intercombination line of strontium. We rely on shelving detection, where electrons are first excited to a metastable state by the spectroscopy laser before their state is probed using the broad transition at 461 nm. arXiv:1910.11718 (2019) \/ J. Phys. B: At. Mol. Opt. Phys. 53 085005 (2020)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2019\/10\/25\/shelving-spectroscopy-of-the-strontium-intercombination-line\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2019-10-25T14:04:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-28T12:40:51+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin PASQUIOU\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin PASQUIOU\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2019\\\/10\\\/25\\\/shelving-spectroscopy-of-the-strontium-intercombination-line\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2019\\\/10\\\/25\\\/shelving-spectroscopy-of-the-strontium-intercombination-line\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Shelving spectroscopy of the strontium intercombination line\",\"datePublished\":\"2019-10-25T14:04:00+00:00\",\"dateModified\":\"2025-10-28T12:40:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2019\\\/10\\\/25\\\/shelving-spectroscopy-of-the-strontium-intercombination-line\\\/\"},\"wordCount\":120,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2019\\\/10\\\/25\\\/shelving-spectroscopy-of-the-strontium-intercombination-line\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/Shelving-spectroscopy-dca04b.svg\",\"keywords\":[\"Anais Molineri\",\"Bruno Laburthe-Tolra\",\"C. 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