12.5mm, VIS-EXT Coated, N-BK7 Wedged Window

Product Details N-BK7 Substrates with a 30 Arcminute Wedge λ/10 Surface Flatness and 20-10 Surface Quality Ideal for Eliminating Etalon Effects Fused Silica Wedged Windows and N-BK7 Flat Windows Also Available TECHSPEC N-BK7 Wedged Windows are available in standard metric sizes with a 30 arcminute wedge. The wedge of these windows eliminate Etalon effects by preventing back surface reflections from traveling along the same optical path as the transmitted beam. In laser cavities, wedged windows help prevent laser instability, mode-hopping, and power spikes caused by these unwanted reflections. TECHSPEC N-BK7 Wedged Windows are often used as a cost-effective alternative to Fused Silica Wedged Windows in applications that do not require UV transmission or where high thermal stability is not required such as with low power visible or NIR lasers. Wedged windows can also be used as beam samplers or beam pick-off optics to monitor laser beam properties such as beam power over time. Specifications General Type: Wedged Window Physical & Mechanical Properties Clear Aperture CA (mm): 11.25 Diameter (mm): 12.50 +0.0/-0.10 Thickness (mm): 3.00 ±0.20 Edges: Fine Ground Young’s Modulus (GPa): 82 Wedge Angle (arcmin): 30′ ±10′ Optical Properties Coating: VIS-EXT (350-700nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 Index of Refraction (n d ): 1.516 Surface Quality: 20-10 Coating Specification: Ravg <0.5% @ 350 - 700nm Wavelength Range (nm): 350 - 700 Surface Flatness (P-V): λ/10 over 25mm Aperture Material Properties Coefficient of Thermal Expansion CTE (10 -6 /°C): 7.1 (-30 to +70°C) 8.3 (+20 to +300°C) Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×