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Precision Flat Mirrors

Precision Flat Mirrors

  • - Material: UV fused silica, BK7 
  • - Clear Aperture: larger than central 85% of the diameter 
  • - 1st Surface: λ/10 @633nm over clear aperture, 10-5 Scratch-Dig 
  • - 2nd Surface: Commercial polish
  • - Diameter tolerance: +0.000/-0.010" (+0.00/-0.25mm) 
  • - Thickness tolerance: ±0.010" (±0.25mm) 
  • - Wedge: ≤5 arcmin
  • - Bevel: <0.5mm @45° typical 
Spectral Optics provides precision flat mirrors designed to be used as dielectric laser mirrors or metal-coated mirrors. These are an excellent choice for optical path folding applications, various imaging systems, and laser applications.
Please click "Contact Us" for our contact information, "Email Inquiry" for inquiring the details about the items on this page via email, or "Request for Quote" for requesting more items not only listed on the page. 



Diameter (D)

Thickness (T)


Part Number

Price ($ USD)

0.5" (12.7mm) 1/4" (6.35mm) Fused silica PM0525-FS $45
BK7 PM0525-BK $37
0.75" (19.1mm) Fused silica PM0725-FS $55
BK7 PM0725-BK $41
1.0" (25.4mm) 1/4" (6.35mm)
3/8" (9.53mm)
Fused silica PM1025-FS $65
BK7 PM1025-BK $50
1.5" (38.1mm) Fused silica PM1525-FS $90
BK7 PM1525-BK $66
2.0" (50.8mm) Fused silica PM2025-FS $110
BK7 PM2025-BK $87
3.0" (76.2mm) 1/2" (12.7mm) Fused silica PM3050-FS $280
BK7 PM3050-BK $220
4.0" (101.6mm) Fused silica PM4050-FS $395
BK7 PM4050-BK $340




1. Usually 0.5 - 2.0" diameter substrates are in stock. Please check the delivery for the larger substrates with us. It usually takes ~3-5 weeks if we don't have any in stock.
2. Some other sizes and/or thicknesses may be available. Please contact us for other custom size windows.
3. Please refer to the coating service section for the detailed coating specs available.