25mm Dia. x 25mm FL, Uncoated, 4μm DWL, CaF 2 Aspheric Lens

Product Details 266nm or 4μm Design Wavelength Options High Transmission from 200nm to 7μm Diamond Turned for High Surface Accuracy Vacuum UV Grade CaF 2 Substrate TECHSPEC Calcium Fluoride (CaF 2 ) Aspheric Lenses have high transmission from the ultraviolet (UV) through the infrared (IR), covering the wavelength range of 200nm to 7μm. Calcium fluoride’s low index of refraction enables these diamond turned aspheric lenses to be integrated with minimal Fresnel reflection loss without an anti-reflection coating. Calcium fluoride also offers low solubility and superior hardness compared to other fluoride-based substrates, allowing for these aspheric lenses to be used in harsh environments. TECHSPEC Calcium Fluoride (CaF 2 ) Aspheric Lenses are available in two designs; one for Nd:YAG, Excimer Laser, and other UV applications with a design wavelength of 266nm and the other for spectroscopic, mid-wave IR (MWIR) thermal imaging, and other IR applications with a design wavelength of 4μm. Please contact us for Calcium Fluoride Aspheric Lenses with custom designs or coating options. Note: Calcium fluoride is a relatively soft optical material and requires careful handling as it is very easily scratched. Calcium fluoride is also susceptible to thermal shock. Specifications General Type: Aspheric Lens Physical & Mechanical Properties Diameter (mm): 25.00 +0.00/-0.10 Center Thickness CT (mm): 11.00 ±0.10 Edge Thickness ET (mm): 2.59 Clear Aperture CA (mm): 22.50 Centering (arcmin): <1 Edges: Diamond Turned Optical Properties Effective Focal Length EFL (mm): 25.00 @ 4000nm Back Focal Length BFL (mm): 18.37 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Calcium Fluoride (CaF 2 ) Vacuum UV Grade f/#: 1.00 Numerical Aperture NA: 0.50 Abbe Number (v d ): 94.99 Coating: Uncoated Wavelength Range (nm): 200 - 7000 Design Wavelength DWL (nm): 4000 Aspheric Design Wavelength (nm): 4000 Surface Quality: 60-40 Asphere Figure Error, RMS @ 632.8nm: λ/6 Regulatory Compliance Certificate of Conformance: View ×