Thulium Fiber Laser (TFL) Optics/Parts
Eternal Optics manufactures high-performance Thulium Fiber Laser Optics and precision optical components optimized for 1940 nm (2 μm) laser systems. Designed for modern Thulium Fiber Lasers (TFL), our optics provide excellent transmission, low optical loss, superior laser damage resistance, and outstanding thermal stability for demanding medical, industrial, and scientific applications.
Our comprehensive range of 2 μm Laser Optical Components includes Optical Windows, Protective Windows, Focusing Lenses, Collimating Lenses, Beam Splitters, High Reflective Mirrors, and other precision optics engineered for high-power thulium fiber laser systems. Every component is manufactured with premium optical materials and advanced dielectric coatings to ensure reliable beam quality, consistent optical performance, and long service life.
In addition to our standard product range, Eternal Optics offers Custom Thulium Fiber Laser Optics tailored to your exact system requirements. We support customized optical materials, diameters, focal lengths, surface quality, AR and HR coatings, mounting configurations, and OEM manufacturing for laser equipment manufacturers, medical device companies, and research institutions worldwide.
Our 1940 nm Laser Optical Components are widely used in:
Medical Laser Systems
Minimally Invasive Surgery
Urology Laser Equipment
Soft Tissue Ablation
Laser Lithotripsy
Precision Material Processing
Polymer and Plastic Processing
Scientific Research
OEM Thulium Fiber Laser Equipment
With advanced optical coating technology, precision manufacturing, and rigorous quality control, Eternal Optics is a trusted supplier of Thulium Fiber Laser Optics, 1940 nm Laser Optics, 2 μm Laser Optical Components, and Custom TFL Optical Solutions, delivering reliable optics for next-generation medical and industrial laser systems.

Thulium Fiber Laser (TFL) Telecentric F-Theta Scan Lens
Telecentric F-Theta Scan lens is a special type of lens system whereby the deflected off-axial laser beam can be per- pendicularly focused to work piece as similar to the on-axial focusing beam. The advantage of the telecentric scan lens is that it is able to flatten the field curvature to the least distortion and yet offering superb spot quality throughout the scan field. For high powered laser and ultrafast laser source, we offer TSL-Q Series Telecentric F-Theta Scan Lens to mini- mize thermal lensing and focal shift.
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Thulium Fiber Laser (TFL) F-Theta Scan Lens
SL-Q Series F-Theta Scan Lenses are developed for ultra fast lasers with short pulse width and high pulse energy laser applications. These lenses are made with low dispersion Fused Silica with optical design to avoid back reflection and ghost image. When a vision system is being integrated into the laser machining system, our achromatic F-Theta scan lenses are colour-corrected between working wavelength and vision wavelength. They can provide accurate vision positioning function and it is very useful for online inspection systems where the operator does not need to have offline inspection on the work piece.
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Thulium Fiber Laser (TFL) Beam Expander
The most common type beam expander is derived from the Galilean telescope which usually has one negative input lens and one positive output lens. The input lens presents a virtual beam focus at the output. For low expansion ratios, the Galilean telescope is most often em- ployed due to simplicity, small package size and low cost. Beam expanders are commonly used to magnify the laser diameter that is to be focused back in a smaller spot size.
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Thulium Fiber Laser (TFL) Zoom Beam Expander
We provide BXZ Series Zoom Expanders with variable zoom factors, covering wavelengths from UV to the IR. 4-axis or 5-axis stages for easy adjustment and alignment are available upon request.
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