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All Products / Optics / Windows and Diffusers / UV and IR Windows / Calcium Fluoride (CaF2) Windows
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

25mm Diameter Uncoated, Calcium Fluoride Window

TECHSPEC Calcium Fluoride (CaF2) Windows

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Stock #47-683 3-5 days
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A$253.79
Qty 1-10
A$253.79
Qty 11+
A$224.13
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Specifications

General

Type:
Protective Window

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture (%):
90
Clear Aperture CA (mm):
22.50
Diameter (mm):
25.00 +0.0/-0.1
Thickness (mm):
3.00 ±0.1
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
158.3
Parallelism (arcmin):
<1
Poisson's Ratio:
0.26
Young's Modulus (GPa):
75.8

Optical Properties

Abbe Number (vd):
94.99
Axis Orientation:
Random
Coating:
Uncoated
Index of Refraction (nd):
1.434
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Calcium Fluoride (CaF2) Vacuum UV Grade
Surface Flatness (P-V):
λ/2
Surface Quality:
40-20
Wavelength Range (nm):
200 - 7000

Material Properties

Coefficient of Thermal Expansion CTE (10-6/°C):
18.85
Density (g/cm3):
3.18

Regulatory Compliance

RoHS 2015:
Compliant
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Reach 219:
Compliant
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Certificate of Conformance:
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Product Details

TECHSPEC® Calcium Fluoride (CaF2) Windows offer a low index of refraction, providing high transmission from 200 - 7000nm when used uncoated. To further increase transmission and reduce back reflections, a variety of AR coatings are available spanning wavelength regions from the Ultra-Violet (UV) to the Mid-Wave Infrared (MWIR). The high bulk damage threshold of calcium fluoride coupled with its low absorption makes it a popular choice for use with laser systems, including excimer lasers. TECHSPEC® Calcium Fluoride (CaF2) Windows are ideal for use as protective windows for gas detectors operating in the Vacuum UV (VUV) and MWIR, UV spectroscopy systems, cryogenically cooled thermal imaging systems, and as substrates for coatings requiring wideband substrate transmission. 

Note: Calcium fluoride is a relatively soft optical material and is more susceptible to scratches than typical glass windows.

Technical Information

Special Handling

These optics require special handling to avoid damage and ensure long-term performance. Proper handling, cleaning, and storage are essential to maintain optical quality. Explore our Optics Cleaning Resources for step-by-step guides and best practices. For personalized assistance, Email us or Chat with our technical support team.

Component Handling Tools
Component Handling Tools

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

Compatible Mounts