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The glass SCHOTT N-BK7® is an example of a high homoge-nous glass that can be produced in high quantities with di-mensions larger than 200 mm in homogeneities of H4 and better. 1. Definition of Homogeneity One of the most important properties of optical glass is the excellent spatial homogeneity of the refractive index of the material.
1. substrate material: n-bk7 2. rohs compliant 3. coating (apply across clear aperture) s1: ravg >95% @ 450 - 650nm s2: none 4. fine grind surface rev. a s1 s2 shape plano plano angle tol. (arcmin) ±2 ±2 surface quality 40-20 40-20 surface flatness λ/4 λ/4 bevel protective as needed protective as needed 47307 75mm enhanced aluminum coated ...
N-BK7HT can be produced to a very low amount of platinum inclusions. Based on this two quality grades can be offered: • A maximum of 10 inclusions per 100 cm3 with diameters < 0.03* mm diameter in parts up to 200 mm diameter. • A maximum of 1 inclusion per 100 cm3 with diameters < 0.03* mm. The raw glass part has been completely laser
The Abbe number of n-BK7 glass is typically around 64.17. This relatively high Abbe number indicates that n-BK7 has low dispersion, meaning it does not spread out light into its constituent colors as much as materials with a lower Abbe number.
Sep 28, 2018 · Due to the above properties, N-BK7 can be used to fabricate both optical windows and optical mirrors. It is most often selected due to its relatively low cost, high refraction index (1.51680 at 587 nm, yellow helium line) and high transmission between 350 nm and 2.5 µm.
Aug 6, 2024 · These uncoated Plano-Convex Lenses are fabricated from RoHS-compliant N-BK7 glass. N-BK7 is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.
People also ask
What is N-BK7 ®?
Can n-bk7ht be produced with low platinum content?
Why is N-BK7 ® not suitable for high power applications?
Which N-BK7 plano-convex lenses can be ordered uncoated?
Is N-BK7 ® better than FS?
Which antireflection coatings are available for N-BK7 plano-convex lenses?
n-bk7 ® is a frequently used optical glass, a chemically stable borosilicate crown glass, molten in ceramic vessels to be free of Platinum impurities. Normally N-BK7 ® has a more instable polishing and is softer than FS, so the surface can be damaged easier.
