Mid-infrared radiation generation in air by four-wave mixing of femtosecond laser pulses

Mid-infrared radiation generation in air by four-wave mixing of femtosecond laser pulses | 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 Mid-infrared radiation generation in air by four-wave mixing of femtosecond laser pulses Virgilijus Vaicaitis, Mateusz Rebarz, Shirly Espinoza, Ona Balachninaite This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8801031/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 Apr, 2026 Read the published version in Optical and Quantum Electronics → Version 1 posted 7 You are reading this latest preprint version Abstract Tunable mid-infrared radiation in the range of \((2.06)\) – \((12\,\mu)\) m was generated in air via loosely focused two-color femtosecond laser pulses. The emission spectra and beam profiles confirm its origin as four-wave difference-frequency mixing in a low-density air plasma filament. Near phase-matching due to low air dispersion opens possibilities for efficient energy conversion at high powers. Four-wave mixing mid-infrared radiation nonlinear optics femtosecond lasers air plasma Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 15 Apr, 2026 Read the published version in Optical and Quantum Electronics → Version 1 posted Editorial decision: Accepted 25 Mar, 2026 Reviews received at journal 10 Mar, 2026 Reviewers agreed at journal 18 Feb, 2026 Reviewers invited by journal 18 Feb, 2026 Editor assigned by journal 08 Feb, 2026 Submission checks completed at journal 07 Feb, 2026 First submitted to journal 05 Feb, 2026 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. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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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-8801031","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":603988390,"identity":"ca2071ee-7ef6-4b9c-b8cc-351bc5a8b8be","order_by":0,"name":"Virgilijus Vaicaitis","email":"","orcid":"","institution":"Vilnius University","correspondingAuthor":false,"prefix":"","firstName":"Virgilijus","middleName":"","lastName":"Vaicaitis","suffix":""},{"id":603988392,"identity":"8f1cfc4c-bc88-44d2-b347-cf5bdfdd3e7a","order_by":1,"name":"Mateusz Rebarz","email":"","orcid":"","institution":"Extreme Light Infrastructure 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