Glass Witness Samples | Sydor Optics

CUSTOM WITNESS SAMPLE FABRICATION

Best practices suggest that when coating or setting up an optical component, it’s best to use a witness sample, also called a “test piece,” to ensure that the actual part will match your specific coating specifications and your application.

Sydor Optics also offers witness samples for the measurement of coating stresses on substrates. The size and thickness of a witness sample will typically match your finished product.

Test samples available before the commitment of a high-volume run

Available Optical Substrates

Based upon customer demand, Sydor Optics offers Witness Samples made from the following optical substrate materials. Of course, if you don’t see a material you need, please contact a Sales Engineer, who will gladly discuss additional options that may be available.

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Color Filter Glass
- Bandpass
- UV Bandpass
- Longpass
- Shortpass
- Multiband
- Neutral Density
- Color Compensating – Cyan
- Blue
- Green
- Heat Absorbing
- Infrared Transmitting
- Light Balancing – Amber
- Light Balancing – Blue
- UV Transmitting / VIS Absorbing
- Sharp Cut – Colorless
- Sharp Cut – Orange
- Sharp Cut – Red
- Sharp Cut – Yellow
- UV Transmitting
- UV Sharp Cut
- Color Compensating - Blue
- Light Balancing
  - Isuzu ILA-400
  - Isuzu ILB-90
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Popular Materials
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Crystal
- Calcium Fluoride (CaF2)
- Magnesium Fluoride (MgF2)
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Display Glass
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Fused Quartz
Fused Quartz is made using high quality, natural quartz powders with several fusion methods. Quartz material is stronger than glass, can be used at high temperatures (<1050°C) and has a high average transmission of over 80% from 260nm to 2500nm. The various qualities of fused quartz allow for use in a wide range of applications from semiconductor applications to lower precision window applications in hostile environments.
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Fused Silica
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IR Materials
- Germanium
- Sapphire
  - Gavish Sapphire
  - Ohara Sapphire
- Silica
  - Corning HPFS 7979 (UV & IR Grades)
- Silicon
- Zinc Sulfide
- Zinc Selenide
  - Hellma CVD Zinc Selenide
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Optical Glass
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Coating Witness Sample Manufacturing Limits
Specfications	Measurements
Diameter	customer specified (typically 25mm – 50mm)
Thickness	customer specified (typically 1mm)
Thickness Tolerance	± 0.1mm
Cosmetics (MIL-PRF-13830B)	60-40 to 20-10
Surface Roughness	≥ 5 Ǻ rms
Reflected Wavefront Error (RWE) - before coating	≥ 1/10 wave over clear aperture
Transmitted Wavefront Error (TWE) - before coating	≥ 1/10 wave over clear aperture
Clear Aperture	≤ 95%

Witness samples

Available Optical Substrates