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Double-Sided Grinding & Polishing

Exceptional Transmitted Wavefront Error, Total Thickness Variation & Parallelism...

Double-Sided Grinding & Polishing

Sizes up to 650mm in diameter; thickness down to 0.10mm...


World-Class Facility
& Equipment

Sydor Optics is home to the largest collection of double-sided polishing machines in North America. With over 40 state-of-the-art double-sided machines our manufacturing capabilities are endless. From prototype to production volumes, Sydor Optics will be there every step of the way. Our team is dedicated to investing in the best technology and equipment the industry has to offer.

Superior Wavefront
& Parallelism

Our double-sided polishing process produces parts with exceptional sub-second parallelism and fractional wavefront error. Sydor Optics technicians and engineers have perfected run-to-run consistency, so you can have the peace of mind that every part will be the same batch after batch, year after year — even with the most stringent requirements.

Prototype — Production

Sydor Optics can achieve a greater economy of scale by using a batch-processing method. So whether you need just a few parts, or tens of thousands, Sydor Optics will analyze the most efficient process to save you both time and money. Our commitment to high-volume, long-term OEM projects is proven by decades-long relationships with the same delighted customers.

Double-Side Machine Sizes

PR Hoffman 6600

Maximum Part Diameter

PR Hoffman 5400

Maximum Part Diameter

PR Hoffman 3100

Maximum Part Diameter

PR Hoffman 1500

Maximum Part Diameter

Double-sided grinding and polishing, also known as double-sided lapping and polishing is performed with particles suspended in a liquid vehicle to abrade parts equally from both surfaces. The process produces a relatively stress-free environment that induces minimal thermal distortion making it compatible with most optical materials.

The double-sided manufacturing process uses planetary action, with the combination of a top and bottom plate — which results in outstanding transmitted wavefront error, parallelism, surface quality and surface roughness.

Double-Sided Polishing Manufacturing Limits

Manufacturing limits depend upon the part size and substrate material and are listed below for general reference. Sometimes, Sydor Optics can do more, so please contact a Sales Engineer, who will gladly discuss options based on your specifications.



Diameter ≤ 650mm
Thickness ≥ 0.1mm (± 0.003mm)
Length / Width ≤ 450mm x 450mm
Bow / Warp 5μm
TTV ≤ 1μm
Surface Roughness ≥ 5 Å rms
Parallelism ≤ 1 arc second
Cosmetics (MIL-PRF-13830B) 60-40 to 10-5
Reflected Wavefront Error (RWE) – before coating ≥ 1/10 wave over 25mm sub-aperture
Transmitted Wavefront Error (TWE)* – before coating ≥ 1/20 wave over clear aperture
*Interferometric Scale Factor (ISF) of 0.5 – Single-Pass