CaF2 Window For UV Optics

CaF2 window is an optical material highly transparent over a wide range of wavelengths from ultraviolet to infrared, especially at 193nm. It is an isotropic crystal with excellent optical properties, making it useful for applications requiring UV, visible, and IR transmission or for situations where wavelengths versatility is essential. It is best suited to high-performance applications where its unique benefits are crucial.

 

We produce high-quality CaF2 optical windows ideal for the most demanding applications where broadband transmission and precision are essential. Our CaF2 window transmits over 95% from 180nm deep into the UV through visible wavelengths and out to 9 μm IR. This allows using a single window material for everything from excimer lasers to CO2 lasers and broad-spectrum imaging systems. They also offer the precision of an isotropic material essential for many optical applications.

 

While CaF2 will always remain a premium optical material, our unparalleled experience and expertise in manufacturing, finishing, and metrology allow us to provide CaF2 optical windows with unique performance abilities at prices representing the best value relative to critical specifications. When ultra-broadband transmission, high precision, or 193nm suitability are required, our CaF2 optical windows offer the ideal solution through superior material properties, skilled fabrication techniques, and value-driven pricing. We invite you to experience the difference that 50 years of CaF2 production experience provides! Please get in touch with us today with your optical window needs.

 

Features

- High broadband transmission

- Uniform refractive index

- Low stress briefringence

- High surface finish

- Resistant to moisture

- Dimensional stability

 

Parameters

Product name	CaF2 Window
UV/VIS/IR Transmission	≥ 95%
193nm Transmission	≥ 97%
Refractive Index	1.5018-1.5020
Surface Quality	60-40 scratch-dig or better
Dimensional Stability	±0.1% change in thickness over
Flatness	≤5 Fringes
Parallelism	≤ 3 arcmin

 

Spectrum Transmission Curve

 

Application

The main applications of CaF2 optical windows and components stem from its unique ultraviolet and infrared transmission properties, high damage threshold, and ability to withstand high energy beams with minimal change in optical properties. Some essential applications include:

- Excimer laser optics

- UV spectroscopy

- UV lithography

- Laser window

- UV spectroscopy

 

Is a window an optical device

An optical window can be considered an optical device, though a simple one. Some key points:

 

• An optical window is designed to transmit light with minimal interference or distortion. It is made of a material transparent to the wavelengths of interest, polished to a smooth surface finish, and has parallel sides. This allows light to pass through largely unaffected.

 

• Windows are often used to separate an optical system from the environment while allowing light to pass through. For example, windows are used on laser cavities, spectroscopic techniques, microscopy components, and other instruments to provide transparent barriers against external conditions like humidity, dust, or hazardous materials.

 

• Though windows typically provide no optical power or focusing ability, they must maintain the wavefront quality, beam diameter, and intensity profile of the light that passes through them. Windows introduce issues like scattering, absorption, reflection, beam divergence, or distortion that can degrade the quality or intensity of the light and interfere with the performance of an optical system.

 

• In some cases, optical windows may be referred to as "blanks" when used as simple substrates or base components in an optical setup onto which other elements like lenses, mirrors, filters, or gratings are attached to provide optical power or manipulation. The window forms an optically neutral but transparent support.

 

• Certain specialized windows may provide some limited optical functionality like beam splitting, filtering, or collimation in addition to a transparent barrier. But most standard optical windows are simple, passive components designed primarily for isolation rather than actively contributing to the visual behavior or focusing of the system.

 

• Some examples of optical windows include:

› Laser windows like those used in excimer lasers like CaF2 windows or fused silica window

› Vacuum viewports made of glasses like BK7, fused silica or sapphire

› Microscope slides and coverslips made of materials such as soda lime glass, borosilicate, or quartz

› Cuvette windows used in spectrophotometers, made of UV-grade fused silica or quartz

› Beamsplitter windows, though these provide some minimal optical effect

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