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TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

Top Seller

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
Single Surface Optical Flats Also Available

TECHSPEC® 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. TECHSPEC® Precision Dual Surface Optical Flats specified for λ/20 flatness that are 76.2mm or larger also include a certificate of calibration. These dual surface flats are uncoated and offered in diameters ranging from 25.40 to 304.80mm.

Common Specifications

Construction:

Dual Surface

Knoop Hardness (kg/mm²):

522

Poisson's Ratio:

0.16

Young's Modulus (GPa):

Bevel:

Protective as needed

Abbe Number (v_d):

67.8

Coating:

Uncoated

Index of Refraction (n_d):

1.458

Surface Quality:

60-40

Wavelength Range (nm):

200 - 2200

Density (g/cm³):

2.20

Products

Surface Flatness (P-V)	Dia. (mm)	Thickness (mm)	Substrate	Stock Number	Price	Buy
λ/10 λ/20	25.40 50.80 76.20 101.60 127.00 152.40 203.20 254.00 304.80	12.70 19.05 25.40 38.10	Fused Silica (Corning 7980) Fused Silica		1,045.50 1,334.50 1,487.50 1,912.50 182.75 2,320.50 2,962.25 259.25 289.85 3,145.00 450.50 5,134.00 5,525.00 629.00 7,225.00 892.50
λ/10 λ/10	25.40 25.40	12.70 12.70	Fused Silica Fused Silica	#43-424	182.75 £182.75 Request Quote	In Stock ×
λ/10 λ/10	50.80 50.80	12.70 12.70	Fused Silica Fused Silica	#43-426	289.85 £289.85 Request Quote	3-4 days ×
λ/10 λ/10	76.20 76.20	19.05 19.05	Fused Silica Fused Silica	#43-428	629.00 £629.00 Request Quote	3-4 days ×
λ/10 λ/10	101.60 101.60	19.05 19.05	Fused Silica Fused Silica	#43-430	1,045.50 £1,045.50 Request Quote	In Stock ×
λ/10 λ/10	127.00 127.00	25.40 25.40	Fused Silica (Corning 7980) Fused Silica (Corning 7980)	#71-132 New New Launched on our website before appearing in our latest print catalogs. Be the first to buy before anyone else!	1,487.50 £1,487.50 Qty 6+ £1,190.00 Request Quote	3-4 days ×
λ/20 λ/20	127.00 127.00	25.40 25.40	Fused Silica (Corning 7980) Fused Silica (Corning 7980)	#71-133 New New Launched on our website before appearing in our latest print catalogs. Be the first to buy before anyone else!	1,912.50 £1,912.50 Qty 6+ £1,530.00 Request Quote	3-4 days ×
λ/10 λ/10	152.40 152.40	25.40 25.40	Fused Silica Fused Silica	#43-432	2,320.50 £2,320.50 Request Quote	3-4 days ×
λ/10 λ/10	203.20 203.20	38.10 38.10	Fused Silica Fused Silica	#43-434	3,145.00 £3,145.00 Request Quote	3-4 days ×
λ/10 λ/10	254.00 254.00	38.10 38.10	Fused Silica Fused Silica	#25-180 New New Launched on our website before appearing in our latest print catalogs. Be the first to buy before anyone else!	5,525.00 £5,525.00 Request Quote	3-4 days ×
λ/10 λ/10	304.80 304.80	38.10 38.10	Fused Silica Fused Silica	#25-182 New New Launched on our website before appearing in our latest print catalogs. Be the first to buy before anyone else!	7,225.00 £7,225.00 Request Quote	Contact Us ×
λ/20 λ/20	25.40 25.40	12.70 12.70	Fused Silica Fused Silica	#48-129	259.25 £259.25 Request Quote	3-4 days ×
λ/20 λ/20	50.80 50.80	12.70 12.70	Fused Silica Fused Silica	#48-130	450.50 £450.50 Request Quote	In Stock ×
λ/20 λ/20	76.20 76.20	19.05 19.05	Fused Silica Fused Silica	#48-131	892.50 £892.50 Request Quote	3-4 days ×
λ/20 λ/20	101.60 101.60	19.05 19.05	Fused Silica Fused Silica	#48-132	1,334.50 £1,334.50 Request Quote	In Stock ×
λ/20 λ/20	152.40 152.40	25.40 25.40	Fused Silica Fused Silica	#48-133	2,962.25 £2,962.25 Request Quote	3-4 days ×
λ/20 λ/20	203.20 203.20	38.10 38.10	Fused Silica Fused Silica	#49-061	5,134.00 £5,134.00 Request Quote	3-4 days ×

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