|UV Fused Silica Plano-Convex Lenses, UV AR-Coated|
|Substrate Material||UV-Grade Fused Silica|
|UV AR Coating Range||290 - 370 nm|
|Reflectivity Over Coating|
Range (AOI = 0°)
|Lens Diameter||Ø1" Lens in a SM1-Threaded Mount (1.035"-40)|
|Diameter Tolerance||+0.00 mm / -0.10 mm|
|Design Wavelength||587.6 nm|
|Index of Refraction|
(@ 587.6 nm)
|Surface Quality||40-20 Scratch-Dig|
|Damage Thresholda||5 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.350 mm)|
|Spherical Surface Powerb|
(Peak to Valley)
|Clear Aperture||>90% of Dia.|
|Focal Length Tolerance||±1%|
- Ø1" Lens Mounted in a SM1-Threaded Mount
- UV AR Coating for the 290 - 370 nm Range
- Fabricated from UV Grade Fused Silica
- Surface Quality: 40-20 Scratch-Dig
Thorlabs' UV Grade Fused Silica Mounted Plano-Convex lenses are available either uncoated or with a UV antireflection coating for the 290 - 370 nm range deposited on both surfaces. 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 additional UV antireflection coating on these plano-convex lenses is particularly desirable for applications with multiple optical elements. Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of a UV AR coating improves transmission, which is particularly important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections.
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 preferrable 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 also offers unmounted versions of our UV-grade fused silica lenses, either uncoated or with AR coatings for one of the following wavelength ranges: 290 - 370 nm (UV), 350 - 700 nm (-A), 650 - 1050 nm (-B), or 1050 - 1620 nm (-C).