Polymer Aspheres

Fresnel Technologies, Inc. offers a line of polymer aspheric lenses that, because they are designed to fit standard 1/2" and 1" lens mounts, are very suitable for prototyping and development work. Of course, the lenses can easily and effectively be used in production systems as well. The lenses are designed for use at conjugates of infinity and the focal length, and with a relatively narrow field of view.

The lenses are available uncoated and with broadband visible or near infrared antireflection (AR) coatings from stock. Other coatings are available for specific wavelengths or ranges. To order a given lens with the broadband coating for the visible, append -BBAR to its part number; for the broadband near infrared coating, append -BBNIR.

The lenses are designed to fit a variety of stock lens mounts. Examples include Edmund Optics' Metric Optics Mounts, parts 56-761 and 54-981, and ThorLabs' 0.5" and 1.0" lens mounts, parts LMR05 and LMR1. As with any optic, the available clear aperture may vary according to the mount chosen, and it is possible that the retaining ring for some mounts may contact and damage the lens' surface.

The lenses are named as follows:

ASP [asphere] - PCX [plano-convex] - 0.5 [inch mount size] - 0.5P [inch focal length, positive] -PMMA [material]

DCX instead of PCX in the name indicates a double-convex, though not necessarily symmetrically so, lens.

A PDF of this list is available. Information on materials for visible light, near infrared, and ultraviolet light applications, including acrylic, is also available in printable form in our Fresnel Lenses brochure (296K PDF).

Part number

Effective focal length

Back focal length

f/#

Center thickness

Edge thickness

ASP-DCX-0.5-0.25P-PMMA

0.25" (6.4mm)

0.16" (4.0mm)

0.5

0.269" (6.83mm)

0.079" (2.0mm)

ASP-DCX-0.5-0.375P-PMMA

0.375" (9.5mm)

0.25" (6.4mm)

0.75

0.240" (6.10mm)

0.079" (2.0mm)

ASP-PCX-0.5-0.5P-PMMA

0.5" (12.7mm)

0.37" (9.4mm)

1

0.194" (4.92mm)

0.079" (2.0mm)

ASP-PCX-0.5-1.0P-PMMA

1.0" (25.4mm)

0.91" (23.2mm)

2

0.131" (3.34mm)

0.079" (2.0mm)

ASP-PCX-0.5-2.0P-PMMA

2.0" (50.8mm)

1.93" (49.0mm)

4

0.105" (2.66mm)

0.079" (2.0mm)

ASP-PCX-0.5-3.0P-PMMA

3.0" (76.2mm)

2.94" (74.6mm)

6

0.096" (2.44mm)

0.079" (2.0mm)

ASP-PCX-0.5-4.0P-PMMA

4.0" (102mm)

3.94" (100.1mm)

8

0.092" (2.33mm)

0.079" (2.0mm)

ASP-PCX-0.5-5.0P-PMMA

5.0" (127mm)

4.94" (125.5mm)

10

0.089" (2.26mm)

0.079" (2.0mm)

ASP-DCX-1.0-0.5P-PMMA

0.5" (12.7mm)

0.316" (8.0mm)

0.5

0.538" (13.67mm)

0.157" (4.0mm)

ASP-DCX-1.0-0.75P-PMMA

0.75" (19.1mm)

0.50" (12.7mm)

0.75

0.481" (12.22mm)

0.157" (4.0mm)

ASP-PCX-1.0-1.0P-PMMA

1.0" (25.4mm)

0.72" (18.4mm)

1

0.413" (10.48mm)

0.157" (4.0mm)

ASP-PCX-1.0-2.0P-PMMA

2.0" (50.8mm)

1.82" (46.2mm)

2

0.274" (6.95mm)

0.157" (4.0mm)

ASP-PCX-1.0-4.0P-PMMA

4.0" (102mm)

3.86" (98.0mm)

4

0.215" (5.45mm)

0.157" (4.0mm)

ASP-PCX-1.0-6.0P-PMMA

6.0" (152mm)

5.87" (149.1mm)

6

0.195" (4.96mm)

0.157" (4.0mm)

ASP-PCX-1.0-8.0P-PMMA

8.0" (203mm)

7.88" (200.1mm)

8

0.186" (4.72mm)

0.157" (4.0mm)

ASP-PCX-1.0-10.0P-PMMA

10.0" (254mm)

9.88" (251.0mm)

10

0.180" (4.58mm)

0.157" (4.0mm)

Mounting dimensions for PCX lenses:
OD Outer diameter
CA Clear aperture
CT Center thickness
ET Edge thickness
EFL Effective focal length
BFL Back focal length

Mounting dimensions and tolerances for PCX lenses

1/2" (12.7mm) outer diameter (OD) lenses all have a clear aperture (CA) of 0.450" (11.4mm). 1" (25.4mm) outer diameter (OD) lenses all have a clear aperture (CA) of 0.940" (23.9mm). Lenses are made from acrylic (PMMA), with index n=1.49 and Abbe number=61.4, and exhibit low birefringence. Typical surface figure tolerance is <3m P-V, mostly power. Typical surface finish is <5nm RMS. Centering is held to <50m.