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Interferometer Flats

Product catalog summary

Interferometer Flats
These are precise and durable fused silica flats designed for laboratory interferometers or as quality assurance standards. Key specifications include:

UV fused silica for excellent thermal stability.
Surface flatness of λ/10 and surface quality of 10-5 scratch-dig.
Slight wedge to virtually eliminate internal fringes.
Available models: 10QB20 and 20QB20 with diameters of 25.4 mm and 50.8 mm respectively.

Sapphire Windows
Sapphire windows are suitable for high-pressure, vacuum, or corrosive environments. They offer:

High transmittance from 150 nm to 5 µm.
Extreme hardness and durability.
Ideal for thermally demanding environments.
Available in 1/2", 1", and 2" diameter sizes.

Specifications include:

Material: Sapphire.
Thickness: 2 mm with size tolerance of +0/-0.25 mm.
Surface quality of 40-20 scratch-dig and flatness of λ/4 @ 633 nm.
Refractive index of 1.765 @ 632.8 nm.
Parallelism ≤3 arc min (≤0.9 mrad).
Clear aperture is 80% of the central diameter.
Hardness (Knoop): 1370 kg mm^-2.
Young's modulus: 3.4 x 10¹¹ N m^-2.
Thermal limit: 22 W m^-1 K^-1.
Thermal expansion coefficient: 8.4 x 10^-6 K.

Ordering Information
For interferometer flats, models include 10QB20 and 20QB20 with specific dimensions and materials. For sapphire windows, models include 05SW8-180, 10SW8-180, and 20SW8-180 with UV grade fused silica and specific tolerances and cleaning recommendations.

Catalog excerpts

O p t i c s 541 Email: [email protected] • Web: newport.com WINDOWS BEAMSPLITTERS OPTICAL FILTERS POLARIZATION OPTICS DIFFRACTION GRATINGS HIGH-ENERGY OPTICS ULTRAFAST LASER OPTICS ACCESSORIES Interferometer Flats These accurate, durable fused silica flats are ideally suited for use in laboratory interferometers or as quality assurance standards. Specifications Ordering Information Model Diameter (mm) Thickness (mm) Substrate Material Surface Figure Surface Quality 10QB20 25.4 9.52 UVFS ë/10 10-5 20QB20 50.8 12.70 UVFS ë/10 10-5 • UV fused silica for excellent thermal stability • ë/10 surface flatness and 10-5 scratch-dig • Slight wedge virtually eliminates internal fringes • Interferogram included C ø A ø B 30 arc min Wedge Dimension (mm) Model ø A ø B C 10QB20 25.4 20.3 9.52 20QB20 50.8 40.6 12.70 Sapphire Windows Sapphire windows are ideal for applications where high pressure, vacuum, or corrosive atmospheres are a consideration. • High transmittance from 150 nm to 5 ìm • Extremely hard and durable material • Ideal for thermally demanding environments • 1/2", 1", and 2" diameter sizes Specifications Material Sapphire Thickness 2 mm Size tolerance +0/-0.25 mm Edge Finish Ground and beveled Refractive Index 1.765 @ 632.8 nm Surface Quality 40-20 scratch-dig Surface Flatness ë/4 @ 633 nm Parallelism 3 arc min (0.9 mrad) Clear Aperture 80% of central diameter Hardness (Knoop) 1370 kg mm-2 Young's modulus 3.4 x 1011 N m-2 Thermal Limit 22 W m-1 K-1 Thermal expansion coefficient 8.4 x 10-6 K WAVELENGTH (ìm) EXTERNALTRANSMITTANCE (%) 0 10 20 30 40 50 60 70 80 90 100 .15 .2 .3 .4 .5 1.0 2 5 10 20 SAPPHIRE (3 mm) Ordering Information Model Diameter (mm) 05SW8-180 12.7 10SW8-180 25.4 20SW8-180 50.8 Material UV grade fused silica Surface Flatness ë/10 at 632.8 nm over the clear aperture Clear Aperture >central 80% of diameter Diameter Tolerance +0/-0.25 mm Thickness Tolerance ±0.5 mm Wedge 30 ±5 arc min Chamfers 25.4 mm: 0.25–0.76 mm face width x 45° ±15° 50.8 mm: 0.38–1.14 mm face width x 45° ±15° Cleaning Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (see page 622) Damage Threshold 5 MW/cm2 CW, 10 J/cm2 with 10 nsec pulses, typical

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Interferometer Flats

Interferometer Flats

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