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Standard Quality Substrates

The precision optics facility of LAYERTEC produces plane and spherically curved mirror substrates, lenses and prisms of fused silica, optical glasses like BK7 and SF10 and some crystalline materials, e.g. calcium fluoride. In the following you can find information on the specifications of our standard substrates. Please do not hesitate to contact us also for other sizes, shapes, radii and materials or for special components like prisms, etalons or meniscus lenses.

Specifications

Plano substrate specs
  • ∅: diameter [mm]
  • t: thickness [mm]
Plano concave substrate specs
  • ∅: diameter [mm]
  • te: edge thickness [mm]
  • tc: centre thickness [mm]

Materials

  • Fused silica: Corning® 7980 or eqivalent
  • Fused silica for high power applications: Suprasil® 300 / 3001 / 3002, Corning® 7980 or eqivalent
  • UV fused silica (excimer grade): SQ1-E193 and SQ1-E248
  • IR fused silica: Infrasil 302® or eqivalent
  • N-BK7® or eqivalent
  • CaF2: single crystal, randomly orientated, special orientations and excimer grade on request
  • Sapphire: single crystal, C-cut
  • YAG: undoped, single crystal, randomly oriented

Dimensions

  • Fused silica, BK7: diameter 3 … 600 mm (0.12  … 23.5 inches)
  • Calcium fluoride, YAG, sapphire: diameter 3 … 50.8 mm (0.12  … 2 inches)
  • Rectangular substrates and other diameters available on request

Plane Substrates, Parallels and Wedges

  • Standard plane substrates: wedge < 5 arcmin
  • Standard parallels: wedge < 1 arcmin or wedge < 10 arcsec
  • Standard wedges: wedge = 30 arcmin or wedge = 1 deg

Plano- Concave and Plano- Convex Substrates

  • Standard radii: 25, 30, 38, 50, 75, 100, 150, 200, 250, 300, 400, 500, 600, 750, 1000, 2000, 3000, 4000, 5000 mm
  • Wedge < 5min

Tolerances

  • Diameter: +0 mm, –0.1 mm
  • Thickness: ±0.1 mm

Surface Form Tolerance (reference wavelength: 546 nm)

MaterialSurface form tolerance
Fused Silicaplaneλ / 10
sphericalλ / 10 reg.
N-BK7planeλ / 10
sphericalλ / 10 reg.
CaF2plane ∅ 6,35 … 25,4 mmλ / 10
plane ∅ 38,1 … 50,8 mmλ / 4
sphericalλ / 4 reg.
Sapphireλ / 10
YAGplaneλ / 10
sphericalλ / 8 reg. (typ. λ / 10 reg.)

Surface Quality

MaterialISO 10110 (∅ 25 mm)Approximately equivalent to MIL-O-13830
Fused Silica5 / 1 x 0.025; L 1 x 0.004Scratch-Dig 10-3
N-BK75 / 1 x 0.040; L 1 x 0.004Scratch-Dig 10-5
CaF25 / 3 x 0.025 L 10 x 0.004Scratch-Dig 20-5
Sapphire5 / 1 x 0.025; L 10 x 0.004Scratch-Dig 20-3
YAG5 / 1 x 0.025; L 2 x 0.004Scratch-Dig 20-3