Thermal Management of a CW Dual-Slab Side-Pumped High-Power Laser Based on the Optical Path Difference

Thermal Management of a CW Dual-Slab Side-Pumped High-Power Laser Based on the Optical Path Difference | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Thermal Management of a CW Dual-Slab Side-Pumped High-Power Laser Based on the Optical Path Difference Mohsen Ghaedrahmati, Masoud Kavosh Tehrani, Abbas Maleki, Seyed Ayoob Moosavi This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6145348/v1 This work is licensed under a CC BY 4.0 License Status: Under Revision Version 1 posted 7 You are reading this latest preprint version Abstract This study investigated the thermal management of a continuous-wave (CW) dual-slab side-pumped high-power Nd:YAG laser, optimizing the cooling channel design to enhance performance. We highlight the critical roles of the cooling channel thickness, coolant flow velocity, and coolant medium type in minimizing the temperature gradient, optical path difference (OPD), and thermal stress within the active medium. We derived an equation to calculate the OPD caused by thermal stress in a side-pumped laser. Our findings indicate that an optimal cooling channel thickness of 0.5 mmš effectively balances heat dissipation with mechanical integrity. Furthermore, increasing the coolant flow velocity markedly reduces the OPD and thermal gradient. We established that the relationship between the fluid inlet velocity and OPD is nonlinear, with a reduction in OPD from 13.1 µmš to 6.71 µm as the fluid velocity increases from 0.2 m/s to 0.6 m/s. Comparative analysis revealed that the use of heavy water instead of pure water reduced the thermal gradient, enhanced the beam quality, and reduced the thermal stress. The transition from pure water to heavy water at optimal conditions reduced OPD from 10.2 µm to 9.47 µmš, underscoring the potential of advanced cooling solutions in laser applications. Thermal management OPD Wavefront aberration Slab laser Side-pumped Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Revision Version 1 posted Editorial decision: Revision requested 14 May, 2026 Reviews received at journal 14 May, 2026 Reviewers agreed at journal 04 May, 2026 Reviewers invited by journal 01 Dec, 2025 Editor assigned by journal 17 Mar, 2025 Submission checks completed at journal 17 Mar, 2025 First submitted to journal 03 Mar, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6145348","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":553598791,"identity":"95d52100-f8e5-4700-b31b-e0841d48fc29","order_by":0,"name":"Mohsen Ghaedrahmati","email":"","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Mohsen","middleName":"","lastName":"Ghaedrahmati","suffix":""},{"id":553598798,"identity":"1ae8e523-1278-4f03-a93e-06b643c7cf22","order_by":1,"name":"Masoud Kavosh Tehrani","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA20lEQVRIiWNgGAWjYFACNjCZwI8sdoAoLZINDIwNpGkxOICkBS/QbWBL/MxTUZdnfO2M+QOGijoG/vYDjIcr8GgxO8B2WJrnzOFis9s5hg0MZw4zSJxJYDh4Bq8W9gbJmW0HErcBtTT/bQP64gYDw0F8TgRqaf45s60ucfNsoC2M/+oY5AlrYTsm8bGNOXGDNEhLAzODARFa0iw+nDmcOON2WuEMhmOHeQzPJDYQ0mJ8I6GiLrF/dvKGDww1dXJyxw8f/ohPC4P8A1Q+DwOx8TMKRsEoGAWjADcAAPc5UQ0U4Q7zAAAAAElFTkSuQmCC","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":true,"prefix":"","firstName":"Masoud","middleName":"Kavosh","lastName":"Tehrani","suffix":""},{"id":553598799,"identity":"0cda49d8-728c-43ba-abcf-6ec0db7e8e06","order_by":2,"name":"Abbas Maleki","email":"","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Abbas","middleName":"","lastName":"Maleki","suffix":""},{"id":553598800,"identity":"9275f839-e317-4b92-86f6-9a7c6646abc0","order_by":3,"name":"Seyed Ayoob Moosavi","email":"","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Seyed","middleName":"Ayoob","lastName":"Moosavi","suffix":""}],"badges":[],"createdAt":"2025-03-03 10:38:25","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6145348/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6145348/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":97370464,"identity":"8eae8108-029c-48ef-8b5d-85da15f7766c","added_by":"auto","created_at":"2025-12-03 16:27:27","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":982681,"visible":true,"origin":"","legend":"","description":"","filename":"finalarticleSendversion1.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6145348/v1_covered_f38310a0-cb74-414f-9109-b743009a2e5c.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Thermal Management of a CW Dual-Slab Side-Pumped High-Power Laser Based on the Optical Path Difference","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":false,"email":"","identity":"journal-of-russian-laser-research","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"","title":"Journal of Russian Laser Research","twitterHandle":"","acdcEnabled":false,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"VoR Journals","inReviewEnabled":false,"inReviewRevisionsEnabled":false},"keywords":"Thermal management, OPD, Wavefront aberration, Slab laser, Side-pumped","lastPublishedDoi":"10.21203/rs.3.rs-6145348/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6145348/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"This study investigated the thermal management of a continuous-wave (CW) dual-slab side-pumped high-power Nd:YAG laser, optimizing the cooling channel design to enhance performance. 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