Thermodynamic Optimization of Atomically Thin Iron-Based Compounds for Mid-Infrared Laser Power Scaling

Thermodynamic Optimization of Atomically Thin Iron-Based Compounds for Mid-Infrared Laser Power Scaling | 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 Article Thermodynamic Optimization of Atomically Thin Iron-Based Compounds for Mid-Infrared Laser Power Scaling Ke Chen, Yunrou Wu, Weitao Liu, Tiantian Yun, Taifeng Liu, Feng Feng, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9365145/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Mid-infrared (MIR) pulsed lasers are pivotal for molecular spectroscopy, atmospheric remote sensing, and surgical medicine, yet their power scaling is severely bottlenecked by the poor thermal stability and low damage threshold of conventional low-dimensional saturable absorbers (SAs). Here, we overcome this bottleneck through a rational thermodynamic optimization strategy based on atomically thin iron-based crystals via space-confined chemical vapor deposition. By screening anionic chalcogens (Se, S, O) paired with Fe, we identify iron oxide as the most thermodynamically stable matrix, while subsequent Mn doping further stabilizes the lattice thermodynamically and modulates carrier dynamics. Experimental analyses reveal that Mn-ion doping significantly enhances the laser-induced damage threshold (a ~3-fold increase over undoped counterparts) and accelerates carrier relaxation (23.63 ps). Consequently, a record-high average output power of >1.0 W was achieved in an Er 3+ -doped fiber laser at 2.8 µm, accompanied by a nanosecond pulse compression and exceptional long-term stability over 30 days. This work establishes lattice thermodynamics as a critical pathway for developing high-energy on-chip MIR ultrashort pulsed lasers, while demonstrating the design flexibility of two-dimensional crystals toward long-wave terahertz photonic devices Physical sciences/Materials science/Nanoscale materials/Two-dimensional materials Physical sciences/Nanoscience and technology/Nanoscale materials/Two-dimensional materials Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SI.docx Thermodynamic Optimization of Atomically Thin Iron-Based Compounds for Mid-Infrared Laser Power Scaling SINCOMMS26028850.pdf Supplementary Information Cite Share Download PDF Status: Under Review Version 1 posted 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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