{"id":2607,"date":"2026-05-05T08:36:12","date_gmt":"2026-05-05T08:36:12","guid":{"rendered":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/?p=2607"},"modified":"2026-05-07T10:41:01","modified_gmt":"2026-05-07T10:41:01","slug":"inertial-earth-rotation-sensing-utilizing-large-ring-lasers","status":"publish","type":"post","link":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/inertial-earth-rotation-sensing-utilizing-large-ring-lasers\/","title":{"rendered":"Inertial Earth Rotation Sensing utilizing Large Ring Lasers"},"content":{"rendered":"\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a4cab14b0f93&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a4cab14b0f93\" class=\"wp-block-image aligncenter size-large is-resized wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"1024\" data-attachment-id=\"2616\" data-permalink=\"https:\/\/www.matterwaveoptics.eu\/fomo2026\/inertial-earth-rotation-sensing-utilizing-large-ring-lasers\/g-ringlaser-edgeon-2\/\" data-orig-file=\"https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1.jpeg\" data-orig-size=\"852,1280\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"G-Ringlaser-EdgeOn\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-682x1024.jpeg\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-682x1024.jpeg\" alt=\"\" class=\"wp-image-2616\" style=\"aspect-ratio:0.6660176575245896;width:227px;height:auto\" srcset=\"https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-682x1024.jpeg 682w, https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-200x300.jpeg 200w, https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-100x150.jpeg 100w, https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1-768x1154.jpeg 768w, https:\/\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/05\/G-Ringlaser-EdgeOn-1.jpeg 852w\" sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Side view of the ring-interferometer<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Ring lasers are now resolving the rate of rotation of the Earth with 8 significant digits. Technically they constitute a Sagnac interferometer, where a traveling wave resonator, circumscribing an arbitrary contour, defines the optical frequencies of two counter-propagating resonant laser beams. Subtle non-reciprocal effects on these laser beams however, cause a variable bias, which reduces the long-term stability. Over the last two years, we have improved the performance of the G ring laser at the Geodetic Observatory Wettzell to the point, that we obtain long-term stable conditions over more than a year. Advances in the modeling of the non- linear behavior of the laser excitation process as well as some small but significant improvements in the operation of the laser gyroscope are taking us now right to the point, where the periodic part of the variable Earth rotation amounting to less than 1 ms in the Length of Day (LoD) can be recovered.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Since a ring laser gyroscope is an inertial sensor, it is sensitive to the precession of the earth rotation axis. This corresponds to a continuous motion of 50 seconds of arc per year. It is the first time that this has been observed by an inertial sensing technique. A laser gyroscope is a local sensor, but we extract a global quantity from it. How accurate are these measurements and where are the persisting error sources? This talk outlines the current state of the art of inertial rotation sensing in the geosciences and points out where the remaining challenges lie. Furthermore, we discuss promising ways for an improved sensor stability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ring lasers are now resolving the rate of rotation of the Earth with 8 significant digits. Technically they constitute a Sagnac interferometer, where a traveling wave resonator, circumscribing an arbitrary contour, defines the optical frequencies of two counter-propagating resonant laser beams. Subtle non-reciprocal effects on these laser beams however, cause a variable bias, which reduces [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2605,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[52],"tags":[220],"class_list":["post-2607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-invited-talk","tag-schreiber-karl-ulrich"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Inertial Earth Rotation Sensing utilizing Large Ring Lasers - FOMO-2026<\/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:\/\/www.matterwaveoptics.eu\/fomo2026\/inertial-earth-rotation-sensing-utilizing-large-ring-lasers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Inertial Earth Rotation Sensing utilizing Large Ring Lasers - FOMO-2026\" \/>\n<meta property=\"og:description\" content=\"Ring lasers are now resolving the rate of rotation of the Earth with 8 significant digits. Technically they constitute a Sagnac interferometer, where a traveling wave resonator, circumscribing an arbitrary contour, defines the optical frequencies of two counter-propagating resonant laser beams. 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B\u00e9guin A.\u00a0(4), Rodzinka T.\u00a0(1),\u00a0\u00a0Dionis E.\u00a0(2), Calmels L.\u00a0(1), Beldjoudi S.\u00a0(1), Minjeong K.\u00a0(3), Curti J.\u00a0(3), Gu\u00e9ry-Odelin D.\u00a0(1), Sugny D.(2), Allard B.\u00a0(1), Gauguet A.\u00a0(1), and Kasevich M.\u00a0(3) (1)\u00a0\u00a0Laboratoire Collisions Agr\u00e9gats et R\u00e9activit\u00e9, France (2)\u00a0\u00a0ICB Institut Carnot de Bourgogne, France (3)\u00a0\u00a0Department of Physics, Stanford University, USA (4)\u00a0\u00a0LTE, Observatoire de Paris, Universit\u00e9 PSL, Sorbonne\u2026","rel":"","context":"In &quot;Invited Talk&quot;","block_context":{"text":"Invited Talk","link":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/category\/conference\/talks\/invited-talk\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/03\/Ashley-Beguin-figure-1.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":2432,"url":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/invited-talk-by-murray-holland\/","url_meta":{"origin":2607,"position":1},"title":"Harnessing AI to Perform Multidimensional Inertial Sensing in an Optical Lattice","author":"wvk_3vn943","date":"March 4, 2026","format":false,"excerpt":"We are developing a precision atom interferometer based on loading a Bose-Einstein condensate into a three-dimensional optical lattice. 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But for new tests of the quantum nature of gravity (Carney et al. 2021) and for robust quantum sensing of acceleration and rotation in the field, atom interferometers must have coherences measured\u2026","rel":"","context":"In &quot;Invited Talk&quot;","block_context":{"text":"Invited Talk","link":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/category\/conference\/talks\/invited-talk\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2026\/04\/HM.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2263,"url":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/experiments-at-the-interface-of-general-relativity-and-quantum-mechanics\/","url_meta":{"origin":2607,"position":3},"title":"Experiments at the interface of general relativity and quantum mechanics","author":"wvk_3vn943","date":"February 24, 2026","format":false,"excerpt":"Ron Folman and the Atom Chip Group, Ben-Gurion University of the Negev The two pillars of modern physics are the theories of General Relativity (GR) and Quantum Mechanics (QM). After decades of theoretical attempts to unify these two pillars under one theoretical framework (often referred to as quantum-gravity), these pillars\u2026","rel":"","context":"In &quot;Invited Talk&quot;","block_context":{"text":"Invited Talk","link":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/category\/conference\/talks\/invited-talk\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.matterwaveoptics.eu\/fomo2026\/wp-content\/uploads\/2024\/04\/Ron_Folman_image.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2604,"url":"https:\/\/www.matterwaveoptics.eu\/fomo2026\/karl-ulrich-schreiber\/","url_meta":{"origin":2607,"position":4},"title":"Karl Ulrich Schreiber","author":"wvk_3vn943","date":"May 5, 2026","format":false,"excerpt":"Professor at the Technical University of Munich\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Research Unit Satellite Geodesy and Geodetic Observatory Wettzell Karl Ulrich Schreiber received his Ph.D. in applied physics in G\u00f6ttingen in 1988. 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