F-Theta Lenses
F-Theta Lenses
F-Theta scan lenses for 2 µm lasers, available as F-TO 170/2000 and F-TO 345/2000.
Overview
Crystal optics for laser scanning
Zinc selenide and calcium fluoride optics offer an alternative to quartz materials, whose OH absorption at this wavelength can cause heating and thermal distortion.
The two lens variants provide different scan fields and focal lengths. They can be purchased separately from the laser system.
* Scan fields on the source website refer to a two-mirror system with distances of 19.7 mm / 35.7 mm from the lens housing.
Technical specifications
| Parameter | F-TO 170/2000 | F-TO 345/2000 |
|---|---|---|
| Wavelength range | 1940–2050 nm | 1940–2050 nm |
| Lens material | ZnSe, CaF2 | ZnSe, CaF2 |
| Effective focal length | 170.2 mm | 344.8 mm |
| Maximum inlet diameter | 10 mm | 20 mm |
| Optical scanning angle | ±22° | ±24° |
| Working distance | 198.7 mm | 316.7 mm |
| Scanning area* | 90 × 90 mm | 205 × 205 mm |
| Focused spot diameter | 47.6 µm | 88.6 µm |
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