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Mounted NBK7 BiConvex Lenses (Uncoated)
LB1869ML (Ø1") LB1187ML (Ø1/2") Please Wait
Features
Thorlabs' Mounted Uncoated NBK7 BiConvex Lenses are popular for many finite imaging applications. This type of lens is best suited for use in situations where the object and image are on opposite sides of the lens and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5. NBK7 is probably the most common optical glass used for highquality optical components. It 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. These Ø1/2" and Ø1" lenses are mounted in SM05 (0.535"40) and SM1 (1.035"40) compatible mounts, respectively. Although this page features our uncoated biconvex lenses, these lenses are also available with one of three antireflection coatings (A, B, or C) deposited on both sides to reduce the amount of light reflected from each surface. Links to each of these pages can be found in the table to the right. Please see the Graphs tab for coating details. Lens kits are available. Please click here for information.
Below is the transmission curve for NBK7, a RoHScompliant form of BK7. Total Transmission is shown for a 10 mm thick, uncoated sample and includes surface reflections. Each NBK7 biconvex lens can be ordered uncoated or with one of the following broadband AR coatings: 350  700 nm (designated as A), 650  1050 nm (designated as B), or 1050  1700 nm (designated as C). Our highperformance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges and provide good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). For optics intended to be used at large incident angles, consider using a custom coating optimized at a 45° angle of incidence; this custom coating is effective from 25° to 52°. The plot shown below indicates the performance of the standard coatings in this family as a function of wavelength. Broadband coatings have a typical absorption of 0.25%, which is not shown in the reflectance plots.
Click here for detailed substrate data. In the thick lens equation, use the index of refraction for NBK7 at the wavelength of interest to approximate the wavelengthdependent focal length of any of the biconvex lenses. The focal length of a thick spherical lens can be calculated using the thick lens equation below. In this expression, n_{l} is the index of refraction of the lens, R_{1} and R_{2} are the radii of curvature for surfaces 1 and 2, respectively, and d is the center thickness of the lens. For biconvex lenses, where the front and back radii of curvature are equal in magnitude and opposite in sign, R_{1} = R_{2} = R, we have The focal length of the lens calculated using the simplified thick lens equation directly above is the distance between the second (back) principle plane (H") and the position at which a collimated beam incident on the curved surface of the biconvex is focused. The same analysis can be performed using a point source and the first (front) principle plane (H'). The principle plane positions of a thick lens can be calculated with the following equations: and Again, for the same biconvex lens, R_{1} = R_{2} = R, we can solve for H' and H' :
 
