Optical Material Precision Blank Fabrication

Optical Material Precision Blank Fabrication

Fused Silica Glass OpticsFused silica optical blanks are used in the manufacturing of electronics, lasers, optical components, scientific instruments, semiconductors, telecom equipment, and an assortment of energy and aerospace applications. As an authorized distributor of Corning HPFS® 7980 and ULE® 7972 and 7973, Dynasil fabricates precision machined optical blanks and other components as well as from a variety of other manufacturers’ optical materials.

We invite inquiries for special sizes and shapes in any grade and in any optical material, as Dynasil offers a full spectrum of raw materials and is equipped to cut, core and fine grind precision optical blanks of virtually any shape, in prototype and production quantities. At the heart of our specialized optical component skills, are our knowledge of optical glass, our in-house capabilities to machine, test and certify our products to your requirements, as well as over fifty-five years of experience.

Optical materials

Dynasil is an authorized distributor of:

Our products come in these standard shapes and sizes:

  • DISCS: to 28″ diameter, 10″ thick
  • SOLID RODS: to 4.5″ in length
  • BARS/BLOCKS: to 50″ diagonal, 6″ thick
  • CUBES: to 10″


Dynasil’s extensive fabrication capabilities include both commercial machine tools and custom designed specialty devices:

  • Diamond sawing: up to 39” x 36”
  • Core drilling up to 15.5” diameter x 4.5” thick
  • Diamond edging: up to 24” diameter x 3.75” thick
  • Cylindrical (centerless) grinding up to 4” diameter x 36” length
  • Surface Grinding: up to 33” (Diameter or Diagonal) x 5” thick standard; larger sizes upon request
  • Precision Beveling: up to 4” diameter, to 15” on rectangles/squares

Our in-house testing capabilities: 

  • Laser Fizeau Interferometer for Index Homogeneity Tests
  • UV-VIS-IR Spectrophotometer for Transmission Measurements
  • Luminance Spectrometer for Fluorescence Testing
  • Polarimeters for Strain/Striae Observation
  • Surface Profilometer

Stock Allowances, Tolerances and Finishes

Unless specifically requested, our optical blanks are created in nominal finished sizes (NFS) of the respective circles, squares, rectangles or prisms. The actual pieces supplied will be blanks that include a finishing stock allowance.

The finishing stock is +.125″ (+/-.040 maximum) on diameter. Pieces 14″ in diameter and over may be saw/hex/rough cut at +.125″ (+.500, -0) on diameter and +.050″ (+.125, -0) on thickness.

Centerless grinding/edging to close tolerances is available on diameters up to 12″.

Length, width, and saw cut thickness are given a finishing stock allowance of +.050″ (+.125, -0) with an 80 grit minimum finish. Blanchard ground finishes (220 grit) are available featuring dimensional tolerances of +/-.005″ maximum.

Optical blanks with a diameter or diagonal of less than 8.6″ and thickness less than .550″ may be I.D. saw cut with a thickness tolerance of +/-.002″ (maximum) and an exceptionally smooth, flat finish.

Dynasil Fused Silica Knowledge Base

Click below to learn more about Fused Silica Products and Services

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