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| Code | 665800 | Type | Achromatic Large-Aperture Collimator for Fiber Optic Systems | |
| Focal Length | 40mm | Coating | Ravg < 0.5% @ 400–650nm | |
| Transmission | 90% @ 405nm ，94% @ 635nm | Mechanical Housing Diameter | Ø34.5mm | |
| Thread Specification | SM1 External Thread | Clear Aperture | Ø20.5mm | |
| Fiber Connector | FC/PC, 2.2mm wide key | Maximum Fiber NA | 0.25 | |
| Typical Output Beam Diameter (Single-Mode Fiber) | 7.3mm (C405-PC-1 @ 405 nm),7.6mm (C630-PC-2 @ 635 nm) | Minimum Focusing Distance | 0.35m |
Clear Aperture
Ø20.5 mm
Coating
400 - 650 nm
Effective Focal Length (EFL)
40 mm
Maximum Coupled Input Fiber NA
0.25
Minimum Focusing Distance
0.35 m
Thread Specification
SM1 External Thread, compatible with Ø1 inch lens tubes
The LBTEK 40 mm EFL Achromatic Large-Aperture Fiber Collimator is designed for large beam diameters. To minimize losses caused by surface reflections, all lenses in the collimator are coated with broadband antireflection coating on both sides. The antireflection coating covers the wavelength range of 400 - 650 nm. The collimator is equipped with a red focusing ring that allows adjustment of the focus distance between infinity and the minimum focusing distance. The included 1.5 mm hex wrench can be used to tighten the locking screws on the housing to lock the focusing ring, ensuring stability. During focusing, only the focusing ring rotates, while the rest of the assembly remains unaffected.
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