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UV Filter Crystals

UVC7

Overview

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A Thermally Stable Ultraviolet Transmitting Filter Material

UVC7 is a proprietary single crystal material ideally suited to filtering ultraviolet light in solar blind, sensing and other applications whose temperates can challenge conventional UV filter crystals.

Formulated specifically to improve high thermal stability without sacrificing UV transmission, UVC7 will tolerate temperatures as high as 125˚C in an enclosed system. At the same time, it has UV transmission properties similar to those of nickel sulfate, a commonly used filter material.

Large Sizes. UVC7 components are available in diameters to 38 mm and thicknesses to 50 mm.
Orientation and Finishing. Crystals are typically oriented with the light path along the z-axis of the crystal, which provides the greatest light attenuation. Polished faces typically are flat to λ/4 @ 633 nm with 80/60 surface quality. Faces are parallel to within 15 arcminutes.
Custom Fabrication. UVC7 parts are custom fabricated to customer specifications; please contact This email address is being protected from spambots. You need JavaScript enabled to view it. or submit a request for quotation with your size and transmission requirements.

Inhouse crystal growth

All UVC7 crystal growth, orientation, fabrication, polishing, and testing is performed at our Northvale, NJ facility, ensuring complete traceability and satisfaction with every single crystal.

Optical Properties

UVC7

Physical and Optical Properties
Crystal Name	UVC7
Crystal Symmetry	Monoclinic
Density	1.92 g/cm³
Refractive Index @ 0.5461µm	n_x = 1.501₈; n_y = 1.509₇; n_z = 1.509₂

Thermal Properties

Material Breakdown Comparison of UV Filter Crystals as a Function of Temperature and Humidity

Nickel Sulfate

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Nickel Sulfate (NiSO₄*6H₂O)

One of the most commonly used UV filter materials, nickel sulfate hexa hydrate crystals have been grown at Inrad Optics for better than two decades. Nickel sulfate is still available for custom-fabricated components as well as in a standard UV filter product.

For applications submitting UV filter crystals to temperatures above 60-65°C where nickel sulfate decomposes even in a sealed environment, Inrad Optics supplies UVC7. This material has optical properties quite similar to nickel sulfate, but much better thermal stability; please refer to the UVC7 page for more detailed information.

Standard Products. Inrad Optics 780 Series UV filters consist of nickel sulfate crystals mounted and sealed between coated filter glass. This combination significantly narrows the nickel sulfate UV passband near 300nm.

Two standard sizes are available:

Model 780-251 - 25 mm round with a 23 mm aperture
Model 780-501 - 50 mm round with a 48 mm aperture

Custom Crystals Available. Contact us for custom sizes or orientation specifications.

Inhouse crystal growth

All nickel sulfate crystal growth, orientation, fabrication, polishing, and testing is performed at our Northvale, NJ facility, ensuring complete traceability and satisfaction with every single crystal.

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