Name: 25mm Dia. x 3mm Thick, BBAR (2000-5000nm) Coated Calcium Fluoride Window
Brand: TECHSPEC
SKU: 23-516
Price: €187,50

Abbe Number (v_d):

94.99

Axis Orientation:

Random

Bevel:

Protective as needed

Clear Aperture (%):

Clear Aperture CA (mm):

22.50

Diameter (mm):

25.00 +0.0/-0.1

Thickness (mm):

3.00 ±0.1

Coating:

BBAR (2000-5000nm)

Coating Specification:

R_avg <1.5% @ 2000-5000nm
R_abs <3.0% @ 2000-5000nm
R_avg <1.75% @ 2000-4000nm

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

18.85

Density (g/cm³):

3.18

Edges:

Fine Ground

Index of Refraction n_d:

1.434

Knoop Hardness (kg/mm²):

158.3

Parallelism (arcmin):

Poisson's Ratio:

0.26

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

Type:

Protective Window

Wavelength Range (nm):

2000 - 5000

Young's Modulus (GPa):

75.8

Type of Window:

Crystal

Regulatory Compliance

RoHS:

Compliant

Certificate of Conformance:

View

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.

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