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| Code | 670159 | Type | Metallic Concave Mirror | |
| Optical Component Material | Borofloat 33 | Diameter | 25.4mm | |
| Diameter Tolerance | +0.0 / -0.1mm | Clear Aperture | 80% CA | |
| Center Thickness | 5.95mm | Thickness Tolerance | ±0.25mm | |
| Edge Thickness | 6.35mm | Operating Wavelength Range | 480nm – 20.0μm | |
| Focal Length | -100mm | Coating | Silver coating with SiO₂ protective layer | |
| Reflectivity | Ravg > 96%a @ 480nm – 2.0μm Ravg > 97.5%a @ 2.0 – 20μm |
Surface Quality (Scratch/Dig) | 40/20 | |
| Surface Flatness (@633nm) | λ/4 | Package Quantity | 1 | |
| Damage Threshold | 0.50J/cm² @ 1550nm, 190fs, 100Hz, Ø11.47μm (100 pulses) |
Substrate Material: Borofloat glass
Operating Wavelength: 480 nm – 20.0 μm (Silver coating)
Protective Layer: SiO₂ overcoat
LBTEK offers silver-coated metallic concave mirrors with diameters of Ø12.7 mm, Ø25.4 mm, and Ø50.8 mm. These mirrors are well-suited for broadband applications such as beam focusing, collimation, collection, and imaging. Metallic concave mirrors provide high reflectivity across a wide spectral range without introducing chromatic aberrations, as the reflection occurs at the metallic surface.
The silver coating, however, is prone to oxidation and discoloration in high-humidity environments. To address this, LBTEK applies a SiO₂ protective layer to isolate the silver film from direct contact with air. While this coating improves durability, silver mirrors should still be stored and used only in low-humidity, room-temperature environments.
Always wear latex gloves or finger cots when handling to prevent contamination from oils or residues.
Handle with care and avoid touching the reflective surface or edges.
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