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See all 12 Products in Family

TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More
40mm Diameter Uncoated, Calcium Fluoride Window

TECHSPEC Calcium Fluoride (CaF2) Windows

Stock #63-209

$185.00

Qty 1-10
$185.00

Qty 11
$166.50

Volume Pricing
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eDrawing: eprt IGES PDF Drawing STEP: step

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Abbe Number (v_d):

94.99

Axis Orientation:

Random

Clear Aperture (%):

Diameter (mm):

40.00 +0.0/-0.1

Thickness (mm):

3.00

Coating:

Uncoated

Coefficient of Thermal Expansion CTE (10^-6/°C):

18.85

Density (g/cm³):

3.18

Index of Refraction n_d:

1.434

Knoop Hardness (kg/mm²):

158.3

Parallelism (arcmin):

Poisson's Ratio:

0.26

Substrate:

Calcium Fluoride (CaF₂) Vacuum UV Grade

Surface Flatness:

λ/2

Surface Quality:

40-20

Thickness Tolerance (mm):

±0.1

Type:

Protective Window

Wavelength Range (μm):

0.2 - 7

Wavelength Range (nm):

200 - 7000

Young's Modulus (GPa):

75.8

Regulatory Compliance

RoHS 2015:

Compliant

REACH 201:

Compliant

Product Family Description

Low Absorption, High Transmission UV Grade Calcium Fluoride
Ideal for Applications Ranging from 200nm - 7μm
Low Index of Refraction

Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 200nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride's low index of refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. TECHSPEC® Calcium Fluoride (CaF₂) Windows manufactured from vacuum UV grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.