This is a mounted aspheric lens from Thorlabs’ C-series, designed for collimating or focusing light in free-space optical setups or fiber-coupled systems.
📌 Key Specs
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Type: Mounted Geltech aspheric lens
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Effective Focal Length (EFL): ~15.29 mm
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Numerical Aperture (NA): 0.16
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AR Coating: Optimized for near-infrared wavelengths (typically around 1050 nm–1600 nm range depending on coating variant)
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Thread Mount: Standard small optical mount (commonly M9 × 0.5) that fits standard optomechanical holders
🧠 What It’s Used For
This type of lens is commonly used to:
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Collimate divergent beams from laser diodes and fiber outputs, especially in near-IR systems.
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Focus light for coupling into fibers or onto detectors.
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Serve as a simple objective lens in compact imaging or microscopy setups.



