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

plane Substrate Specs
  • : diameter [mm]
  • t: thickness [mm]
plane Substrate Specs
  • : diameter [mm]
  • te: edge thickness [mm]
  • tc: centre thickness [mm]

Materials

  • Fused silica: Corning 7980® or Lithosil® Q2 (SCHOTT AG)
  • Fused silica for high power applications: Suprasil® 300 / 3001 / 3002 (Heraeus)
  • UV fused silica (excimer grade) Lithosil® Q1 E -193 and E - 248 (SCHOTT AG) IR fused silica: Infrasil 302® (Heraeus)
  • BK7®: optical glass (SCHOTT AG)
  • CaF2: transparent from UV to IR, prices for excimer grade qualities on request
  • Sapphire: random oriented, single crystal, special orientations on request
  • YAG: undoped, random oriented, single crystal

Dimensions

  • Fused silica, BK7: diameter 6.35mm … 508mm (¼ inch … 20 inches)
  • Calcium fluoride, YAG, sapphire: diameter 6.35mm … 50.8mm (¼ inch ... 2 inches)
  • Rectangular substrates and other diameters available on request

Plane Substrates, Parallels and Wedges

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

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, 5000mm
  • Wedge: CaF2: wedge < 15min, all other materials: wedge < 5min

Tolerances

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

Surface Form Tolerance

Fused silicaλ / 10 (633nm)
BK7λ / 10 (633nm)
CaF2 Plane∅ 6.35mm … 25.4mmλ / 10 (633nm),
∅ 38.1 … 50.8mmλ / 4 (633nm)
Sapphire5 / 3 x 0.025 L20 x 0.0025
YAG5 / 1 x 0.025 L2 x 0.004
YAG5 / 1 x 0.025 L2 x 0.004

Surface Quality

MaterialISO 10110 (∅25mm)Approximately equivalent to MIL-O-13830
Fused Silica5 / 1 x 0.025 L1x 0.001Scratch - Dig 10 - 3
BK75 / 2 x 0.040 L1x 0.001Scratch - Dig 10 - 5
CaF25 / 3 x 0.025 L1x 0.0025Scratch - Dig 20 - 3
Sapphire5 / 3 x 0.025 L20 x 0.0025Scratch - Dig 40 - 3
YAG5 / 1 x 0.025 L2 x 0.004Scratch - Dig 40 - 3