Name: 40mm Diameter, NIR II Coated, Calcium Fluoride Window
Brand: TECHSPEC
SKU: 14-832
Price: £209.10

Abbe Number (v_d):

94.99

Axis Orientation:

Random

Bevel:

Protective as needed

Clear Aperture (%):

Clear Aperture CA (mm):

36.00

Diameter (mm):

40.00 +0.0/-0.1

Thickness (mm):

3.00 ±0.1

Coating:

NIR II (750-1550nm)

Coating Specification:

R_abs ≤1.5% @ 750 - 800nm
R_abs ≤1.0% @ 800 - 1550nm
R_avg ≤0.7% @ 750 - 1550nm

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:

λ/2

Surface Quality:

40-20

Type:

Protective Window

Typical Energy Density Limit:

8 J/cm² @ 1064nm, 10ns

Wavelength Range (nm):

750 - 1550

Young's Modulus (GPa):

75.8

Regulatory Compliance

RoHS 2015:

Compliant

Reach 219:

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.

Title	Type	Stock Number	Price	Buy
40.0mm Optic Dia., Optic Mount	Fixed	#64-566	£28.70 Qty 10+ £25.83 Request Quote	In Stock ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#36-605	£56.17 Qty 10+ £49.61 Request Quote	In Stock ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	£72.98 Qty 10+ £65.68 Request Quote	3-4 days ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-670	£77.08 Qty 10+ £68.06 Request Quote	3-4 days ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	£78.72 Qty 10+ £70.85 Request Quote	3-4 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	£78.72 Qty 10+ £70.85 Request Quote	In Stock ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	£81.18 Qty 10+ £73.06 Request Quote	In Stock ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	£109.06 Request Quote	3-4 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	£284.54 Qty 5+ £250.92 Request Quote	3-4 days ×