Used to bend light to a specific angle. Note the coarse and fine prism arrays incorporated into one optical element. This Variable Pitch Prism Array demonstrates only a small selection of possible groove spacings.
Specs:
Dimensions: 40 mm x 18 mm
Pitch Range: 0.065 to 0.640 mm
Pitch Increment: 0.005 mm
Prism Angle: 90°
Tilt of Prism Facets Along +45° Diagonal: 30°
Tilt of Prism Facets Along -45° Diagonal: 45°
Designed to demonstrate the relationship between dispersion angle and lenslet aperture size. Lenslet aperture diameter increases radially along a logarithmic spiral from about .247mm to 2.554mm. Each lenslet center is placed at golden angle increments (~137.5 degrees) along the spiral. The lenslet radius is 1.277mm, and the radius of curvature is the same for all 197 lenslets.
Use a laser pointer to show that the smaller lenslet apertures spread light less than the larger apertures.
The Zernike lens in Ruler v2 is highly exaggerated for ease of visualizing characteristics. Zernike optics can be specifically designed as inverse, non-rotationally symmetric corrector plates to correct known aberrations in optical systems.
Place these lenses 5.5mm above the grid on the back of the blue ruler sleeve to contrast the behavior of spherical and aspherical lenses. Note the image through the spherical lens is distorted and that the asphere's is not. These are f/ 1.5 lenses with an effective focal length (EFL) of 12.0 mm at Na d-line.
Fresnel Technologies, Inc. specializes in the design and manufacturing of molded plastic Fresnel lenses, molded polymer optics in general, and infrared-transmitting optical materials. We offer design assistance, diamond machining, prototyping, tooling, and production. Stock or custom, we’re your optics partner.
101 W. Morningside Drive
Fort Worth, TX 76110
Phone: (817) 926-7474
info@fresneltech.com
