We give below typical reflectance (per surface) performance for our coated singlet lenses. Two typical curves are shown for each coating. Curve 2 applies only to convex surfaces of short radius (R greater than 1.33 x dia.) and Curve 1 to all other surfaces.

Note that a few lenses (the PX type) have single layer AR coatings, this coating being very effective on a high-index glass. For a performance curve for this type see the technical tab under High-index planoconvex laser lenses.

Spherical aberration calculation

To calculate the spherical aberration of a system and evaluate its effect proceed as follows.

1. Calculate element contributions

For each lens element work out the wavefront aberration A:

A = ky⁴/f³

where y is the semi-aperture, or maximum ray height at the element (from an on-axis object); f is the element focal length, and the coefficient k depends on material, shape and conjugates and is given in the relevant section of this catalogue.

2. Sum contributions

Simply add the contributions algebraically to give the total wavefront aberration ΣA (deviation from the best-fit sphere).

3. Evaluate effect

If ΣA is less than λ/4 the system is diffraction limited and aberration can usually be neglected. For larger aberration, the geometrical spot diameter D is given by:

D = 8 ΣAv/y

where y is as above, for the last element, and v is the distance from this element to the image.

For further detail request our Technical Note ‘Spherical aberration’.

• Mounting  (lenses up to 50mm dia.)
• Special AR coating
• Edging to smaller diameters

For more details of your modification needs please enquire.

Uncoated planoconvex lenses:
04 PQ 01 - 10mm set (9 lenses)
05 PQ 01 - 16mm set (9 lenses)
06 PQ 01 - 25mm set (19 lenses)
07 PQ 01 - 40mm set (9 lenses)

AR-coated planoconvex lenses (450-900nm):
01 PB 01 - 10mm set (9 lenses)
02 PB 01 - 16mm set (9 lenses)
03 PB 01 - 25mm set (19 lenses)
04 PB 01 - 40mm set (9 lenses)