Lithium Fluoride Optical Window

Lithium fluoride(LiF) is a specialized vacuum-UV-to-mid-IR window material with leading deep-UV transmission, very low dispersion, and excellent homogeneity for vacuum-UV optics, deep-UV lasers, broadband spectroscopy, and research metrology. Scysgx uses high-purity single crystals, more than 260 precision-processing machines, and 65 specialist inspection instruments for closed-loop cutting, grinding, polishing, coating, and inspection. Round, square, and custom windows span 1–1000mm, in commercial and precision grades, with flatness up toλ/20. AR, HR, and DLC diamond-like carbon coatings provide precise, stable broadband windows. Some standard versions have regular stock for rapid delivery.

Vacuum-UV/deep-UV optics: windows for vacuum-UV detection, deep-UV lithography, UV lidar and UV light-source systems. Broadband spectroscopy: windows for UV/mid-IR dual-band spectrometers, high-precision research spectrometers and metrology instruments. Laser equipment: deep-UV laser protective windows and UV optical-path protection for high-power UV lasers. Research and metrology: optical windows for university laboratories, astronomical optics, precision optical metrology and vacuum optical experiments. Special optics: windows for space vacuum-UV detection, airborne imaging and environmental optical monitoring.

Ultrabroad spectral transmission: excellent, stable transmission over 150nm–6000nm from vacuum UV to mid-IR, with industry-leading deep-UV transmission at 150nm for vacuum-UV/deep-UV systems. Ultralow dispersion: Abbe number up to 97.29, among the best dispersion characteristics of common optical crystals, eliminating broadband chromatic interference and ensuring imaging and detection accuracy. Ultraprecision planar fabrication: high-precision flatness to λ/20, parallelism down to 1″ and surface quality to 10-5, without scratches or defects, ensure stable optical transmission. Full shape/specification customization: circular, square and irregular shapes with steps, slots or holes, dimensions 1–1000mm and thickness 0.15–300mm suit diverse installations. Multiple coatings: antireflection, high reflection, filtering, polarization, beam splitting, DLC diamond-like carbon and high-laser-damage-threshold coatings support multifunction systems. Excellent physicochemical stability: optical homogeneity, extremely low scattering and stable, drift-free long-term performance in harsh research and industrial environments. Two grades: commercial for general industry and high precision for research/metrology, balancing performance and cost. IV. Core material advantages. Spectral coverage: high broadband transmission over 150nm (vacuum UV)–6000nm (mid-IR), a preferred deep-UV/mid-IR dual-band material without significant absorption or scattering. Optical properties: refractive index n_d=1.392, Abbe number Vd=97.29, ultralow dispersion, high contrast and easily corrected aberrations for precision broadband imaging and spectroscopy. Physical properties: density 2.64g/cm³, Knoop hardness 102, moderate mechanical strength, excellent machinability and ultraprecision planar polishing. Thermal properties: expansion coefficient 37×10⁻⁶/℃, softening temperature 600℃ and stable optical performance for research-equipment environments. Application advantages: outstanding deep-UV transmission, an irreplaceable window material for vacuum-UV/deep-UV laser systems in advanced research and metrology. V. Customization. Shapes: circular, square, rectangular and irregular, including steps, slots, holes and counterbores, with nonstandard sizes available. Dimensions: diameter/side length 1–1000mm, thickness 0.15–300mm, optimized tolerance grades for equipment space requirements. Surface treatment: chamfering, edge grinding, ultraclean polishing and custom cleaning for cleanrooms and vacuum environments. Coatings: band-specific antireflection, high reflection, filtering, polarization and beam splitting to improve optical performance. VI. Standard coatings. Vacuum-/deep-UV AR: dedicated 150–400nm antireflection improves deep-UV transmission and reduces reflection losses. Near-/mid-IR AR: 1.65–3μm and 3–5μm for infrared optics and lasers. Broadband AR: full-band 150nm–6μm for vacuum-UV/mid-IR dual-band systems. DLC: improves surface hardness, contamination and scratch resistance and window life in laboratory/industrial use. High-laser-damage-threshold coatings improve strong-laser tolerance and protect core optics in high-power UV/IR systems. Other coatings: high reflection, filtering, polarization and beam splitting for multifunction optics. VIII. Yasi Optical advantages. Fully controlled in-house production: closed-loop blank cutting, milling/grinding, polishing, coating, inspection, cleaning and packaging, without outsourcing and with full traceability. Precision equipment: ZYGO interferometers, precision parallelism testers, optical dimensional measuring instruments and surface-quality testers ensure flatness, parallelism and transmission compliance. Oversize fabrication: batch production of 1–1000mm large-aperture lithium fluoride windows for high-end systems. One-stop customization: shapes, dimensions, tolerances and coatings, optical-path adaptation support and dedicated nonstandard solutions. Two-grade delivery: commercial and high-precision grades, stable small/large-batch supply for general industry and advanced research/metrology. Stock and delivery: some standard products remain in stock for rapid delivery; controlled custom-order lead times meet project schedules. IX. Quality assurance. All lithium fluoride windows undergo ZYGO interferometric flatness, precision parallelism, optical dimensional, spectral transmission and surface-quality inspections to ensure 100% compliance. Automated ultrasonic ultraclean washing and vacuum moisture-proof packaging ensure transport and long-term stability for cleanrooms and vacuum environments.