Name: 20mm Diameter VIS-NIR Coated, Ultra-Thin N-BK7 Window
Brand: TECHSPEC
SKU: 22-039
Price: S$161.25

20mm Diameter VIS-NIR Coated, Ultra-Thin N-BK7 Window

Abbe Number (v_d):

64.17

Bevel:

Protective as needed

Clear Aperture CA (mm):

18.00

Diameter (mm):

20.00 +0.00/-0.10

Thickness (mm):

0.20 ±0.025

Coating:

VIS-NIR (400-1000nm)

Coating Specification:

R_abs ≤0.25% @ 880nm
R_avg ≤1.25% @ 400 - 870nm
R_avg ≤1.25% @ 890 - 1000nm

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

7.1 (-30 to +70°C)
8.3 (+20 to +300°C)

Density (g/cm³):

2.51

Edges:

Fine Ground

Index of Refraction n_d:

1.516

Knoop Hardness (kg/mm²):

610

Parallelism (arcsec):

<30

Poisson's Ratio:

0.206

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

N-BK7

Surface Quality:

20-10

Transmitted Wavefront, P-V:

<λ/2

Type:

Protective Window

Typical Energy Density Limit:

5 J/cm² @ 532nm, 10ns

Wavelength Range (nm):

400 - 1000

Young's Modulus (GPa):

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

Product Family Description

Ultra-Thin 0.20mm Thickness
Precision N-BK7 Substrate
Extremely Lightweight

TECHSPEC® Ultra-Thin N-BK7 Windows are our thinnest windows available and are at least 1/10 the thickness of our traditional N-BK7 windows. Their extremely thin designs make them ideal for both weight and size sensitive applications. Additionally, their high tolerance design yields minimal beam distortion and scatter. They are available uncoated or with a MgF₂ anti-reflection coating. For custom sizes or coating options, please contact our Sales Department.

Note: The Ultra-Thin N-BK7 Windows are very fragile. Handle these windows with care.

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