Precision Optical Flat Mirrors
Material: Fused Silica or ZERODUR®
Surface Quality: 60-40
Surface Flatness: l/20, l/10
Coating: See page 88 for specifications
How to Order an Optical Flat Mirror
43-420 - 000
50.8mm Diameter l/20
ZERODUR® Flat, Uncoated
50.8mm Diameter l/20
ZERODUR® Flat, Gold Coated
Substrate Cod Coating Code
43-420 - 566
• λ/10 and λ/20 Surface Flatness
• l/10 and l/20 Accuracies
• Variety of Coating Options Offered
TECHSPEC® Precision Optical Flat Mirrors are an excellent choice for interferometry, imaging systems, laser
applications, optical path folding, and autocollimation. All mirrors are available coated or uncoated, and the
second surface is pitch polished to window quality.
These optical flat mirrors are offered with two substrate options: ZERODUR® and Fused Silica. ZERODUR®
is a yellow tinted glass ceramic developed by SCHOTT®. ZERODUR® features an extremely low coefficient of
thermal expansion of ±0.10 x 10-6/°C. In applications where temperature fluctuation is a concern, ZERODUR®
offers a thermal stability that is unmatched. Fused Silica is optically clear and features excellent resistance to
abrasion and high durability, with a low coefficient of thermal expansion of ±0.55 x 10-6/°C. For harsh environments,
or in applications where wear and tear is a factor, Fused Silica is an ideal choice.
TECHSPEC® ZERODUR® Precision Optical Flat Mirrors
Diameter
(mm)
Diameter
Tolerance
(mm)
Thickness
(mm)
Thickness
Tolerance
(mm)
l/20 Mirrors l/10 Mirrors
Substrate
Code
Uncoated
-000 Price
Substrate
Code
Uncoated
-000 Price
12.7 +0.0/-0.5 3.2 ±0.8 #43-404 £102.00 #43-327 £69.70
25.4 +0.0/-1.0 12.7 ±1.5 #43-412 £144.50 #32-195 £106.25
50.8 +0.0/-1.0 12.7 ±1.5 #43-420 £242.25 #32-199 £174.25
76.2 +0.0/-1.0 19.1 ±1.5 #48-117 £446.25 #31-391 £331.50
101.6 +0.0/-1.0 19.1 ±1.5 #48-118 £684.25 #31-392 £612.00
152.4 +0.0/-1.0 25.4 ±2.0 #48-119 £2,150.50 #31-393 £1,423.75
203.2 +0.0/-1.0 38.1 ±2.5 #49-049 £3,506.25 #31-394 £2,911.25
TECHSPEC® Fused Silica Precision Optical Flat Mirrors
Diameter
(mm)
Diameter
Tolerance
(mm)
Thickness
(mm)
Thickness
Tolerance
(mm)
l/20 Mirrors l/10 Mirrors
Substrate
Code
Uncoated
-000 Price
Substrate
Code
Uncoated
-000 Price
12.7 +0.0/-0.5 3.2 ±0.8 #43-400 £86.70 #43-319 £61.20
25.4 +0.0/-1.0 12.7 ±1.5 #43-408 £136.00 #01-913 £90.95
50.8 +0.0/-1.0 12.7 ±1.5 #43-416 £204.00 #01-914 £153.00
76.2 +0.0/-1.0 19.1 ±1.5 #47-573 £369.75 #01-915 £293.25
101.6 +0.0/-1.0 19.1 ±1.5 #47-574 £633.25 #01-611 £582.25
152.4 +0.0/-1.0 25.4 ±2.0 #47-575 £1,870.00 #01-612 £1,300.50
203.2 +0.0/-1.0 38.1 ±2.5 #49-048 £3,336.25 #31-390 £2,694.50
254.0 +0.0/-1.0 38.1 ±2.5 #65-879 £6,094.50 #46-715 £4,080.00
304.8 +0.0/-1.0 38.1 ±2.5 #65-880 £8,219.50 #69-921 £5,291.25
Diameter
(mm)
Protected
Aluminum
-522
Enhanced
Aluminum
-533
Protected
Gold
-566
Protected
Silver
-577
12.7 £8.50 £12.75 £25.50 £21.25
25.4 £12.75 £17.00 £25.50 £21.25
50.8 £21.25 £42.50 £93.50 £85.00
76.2 £34.00 £85.00 £110.50 £102.00
101.6 £63.75 £106.25 £140.25 £127.50
152.4 £85.00 £148.75 £233.75 £212.50
203.2 £170.00 £191.25 £297.50 £276.25
254.0 £255.00 £297.50 £403.75 £382.50
304.8 £340.00 £382.50 £488.75 £467.50
For large kinematic optical mounts,
see page 232
Precision Dual Surface Optical Flats
• λ/10 and λ/20 Surface Flatness Options
• Each λ/20 Flat 76.2mm and Larger Includes a Certificate of Calibration
• Extended Lifetime in Contact Measurement Applications
Our Precision Dual Surface Optical Flats are precision ground and polished to the stated accuracies on both
surfaces so that either face may be used for test applications. Both surfaces are tested and certified by our
Zygo Interferometer. Each flat ships in a durable storage case for permanent protection. λ/20 flats that are
76.2mm or larger also include a certificate of calibration.
Material: Fused Silica
Surface Quality 60-40
Diameter Tolerance (mm): +0/-1.0
434 +44 (0) 1904 788600 | Edmund Optics® N NEW PRODUCT NEW LOW PRICE
testing & detection targets illumination cameras imaging lenses microscopy lasers optomechanics optics
TECHSPEC® Precision Dual Surface Optical Flats
Diameter
(mm)
Thickness
(mm)
Parallelism
(typical)
l/20 l/10
Stock No. Price Stock No. Price
25.4 12.7±1.5 30 arcsec #48-129 £204.00 #43-424 £146.20
50.8 12.7±1.5 30 arcsec #48-130 £357.00 #43-426 £229.50
76.2 19.1±1.5 1 arcmin #48-131 £722.50 #43-428 £510.00
101.6 19.1±1.5 1 arcmin #48-132 £1,071.00 #43-430 £839.80
152.4 25.4±2.0 1 arcmin #48-133 £2,380.00 #43-432 £1,870.00
203.2 38.1±2.5 1 arcmin #49-061 £4,165.00 #43-434 £2,541.50
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