• PCX-Lenses-UVFS-JGS-1

UV Fused Silica (JGS1)
Plano-Convex Lenses

Plano-convex (PCX) lenses have a positive focal length and can be used to focus collimated light, to collimate a point source, or to reduce the divergence angle of a diverging source. When image quality is not critical, plano-convex lenses can also be used as a substitute for achromatic doublets. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.
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.

Each UVFS lens presented here can be offered with a 532/1064 nm, 405 nm, 532 nm, or 633, or 1064 nm, or 1550 nm nm laser line V-coating. Our V-coats have a minimum reflectance of less than 0.25% per surface at the coating wavelength and are designed for angles of incidence (AOI) between 0° and 20°. Compared to our broadband AR coatings, V-coatings achieve lower reflectance over a narrower bandwidth when used at the specified AOI. For more information on other AR coatings such as broadband of 245 – 400 nm, 350 – 700 nm, or 650 – 1050 nm, please contact us for details.

Paralight Optics offers UV or IR-Grade Fused Silica (JGS1 or JGS3) Plano-Convex (PCX) lenses available in different sizes, either uncoated lenses or with a high-performance multi-layer antireflection (AR) coating optimized for the ranges of 245-400nm, 350-700nm, 650-1050nm, 1050-1700nm, 532/1064nm, 405nm, 532nm, 633nm deposited on both surfaces, this coating greatly reduces the high surface reflectivity of the substrate less than 0.5% across the entire AR coating range for angles of incidence (AOI) between 0° and 30°. 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°. Check the following Graphs for your references.






Better Homogeneity and a Lower Coefficient of Thermal Expansion than N-BK7

Wavelength Range:

245-400nm, 350-700nm, 650-1050nm, 1050-1700nm, 532/1064nm, 405nm, 532nm, 633nm

Focal Lengths:

Available from 10 - 1000 mm


Common Specifications:


Reference Drawing for

Plano-Convex (PCX) Lens

Dia: Diameter
f: Focal Length
ff: Front Focal Length
fb: Back Focal Length
R: Radius
tc: Center Thickness
te: Edge Thickness
H”: Back Principal Plane

Note: The focal length is determined from the back principal plane, which does not necessarily line up with the edge thickness.


Ranges & Tolerances

  • Substrate Material

    UV-Grade Fused Silica (JGS1)

  • Type

    Plano-Convex (PCV) Lens

  • Index of Refraction

    1.4586 @ 588 nm

  • Abbe Number (Vd)


  • Thermal Expansion Coefficient (CTE)

    5.5 x 10-7 cm/cm. ℃ (20℃ to 320℃)

  • Diameter Tolerance

    Precison: +0.00/-0.10mm | High Precision: +0.00/-0.02mm

  • Thickness Tolerance

    Precison: +/-0.10 mm | High Precision: -0.02 mm

  • Focal Length Tolerance


  • Surface Quality (Scratch-Dig)

    Precison: 60-40 | High Precision: 40-20

  • Surface Flatness (Plano Side)


  • Spherical Surface Power (Convex Side)

    3 λ/4

  • Surface Irregularity (Peak to Valley)


  • Centration

    Precison: < 5 arcmin | High Precision: <30 arcsec

  • Clear Aperture

    90% of Diameter

  • AR Coating Range

    See the above description

  • Transmission over Coating Range (@ 0° AOI)

    Ravg > 97%

  • Reflectance over Coating Range (@ 0° AOI)

    Tavg < 0.5%

  • Design Wavelength

    587.6 nm

  • Laser Damage Threshold

    5 J/cm2 (10ns,10Hz,@355nm)



♦ Transmission curve of uncoated NBK-7 substrate: high transmission from 0.185 µm to 2.1 μm
♦ The V-coating is a multilayer, anti-reflective, dielectric thin-film coating designed to achieve minimal reflectance over a narrow band of wavelengths. Reflectance rises rapidly on either side of this minimum, giving the reflectance curve a “V” shape, as shown in the following performance plots for 532nm, 633nm, and 532/1064nm V-coatings. For more information or get a quote, feel free to contact us.


532 nm V-Coat Reflectance (AOI: 0 - 20°)


633 nm V-Coat Reflectance (AOI: 0 - 20°)


532/1064 nm V-Coat Reflectance (AOI: 0 - 20°)