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UV Fused Silica Plano-Convex Lenses, V-Coated: 633 nm
Thorlabs' UV-Grade Fused Silica Plano-Convex lenses are available here with an AR V-Coating centered at 633 nm deposited on both surfaces. These lenses have diameters of Ø1/2" or Ø1". Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.
UV-grade fused silica offers high transmission in the deep UV and exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications from the UV to the near IR. In addition, UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7.
The V-coating is a multilayer, antireflective, dielectric, thin-film coating that achieves less than 0.25% reflectance over a narrow wavelength range. Reflectance rises rapidly on either side of this minimum, giving the reflectance curve a "V" shape (see Graphs tab for performance plots). When compared to broadband AR offerings, dielectric V-coats achieve lower reflectivity over a narrower bandwidth and incident angle.
With a reflectance of less than 0.25% at 633 nm, these V-Coated lenses provide exceptional transmittance and are ideal for use with HeNe lasers, as well as applications where light is transmitted through complex optical systems.
Plano-convex lenses have positive focal lengths and are the most popular type of lens element. They are commonly used to focus a collimated incident beam; in such cases the collimated light source should be incident on the curved surface to minimize spherical aberrations. When image quality is not critical, plano-convex lenses can also be used as a substitute for achromatic doublets.
When deciding between a plano-convex lens and a bi-convex lens, both of which cause collimated incident light to converge, it is usually preferable to choose a plano-convex lens if the desired absolute magnification is either less than 0.2 or greater than 5. Between these two values, bi-convex lenses are generally preferred.
Thorlabs offers fixed lens mounts that can be used for mounting the lenses sold here. For mounting high-curvature lenses in select sizes, extra-thick retaining rings with SM05 (0.535"-40) or SM1 (1.035"-40) threading are available that provide extra clearance for spanner wrenches (see the Mounting Options tab for more information).
Optics cases are also available for storage of these lenses. Please click here for information.
Below is the transmission curve for a 10 mm thick uncoated sample of UV fused silica when the incident light is normal to the surface. Please note that this is the measured transmission, including surface reflections.
633 nm V-Coat Reflectance (AOI: 0 - 20°)
The plot on the right is an enlarged view of the shaded region:
Other AR Coatings:
Mounting High-Curvature Optics
Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.
Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.