5mm Diameter, 1550nm V-Coat, λ/4 N-BK7 Window

Bevel:

Protective as needed

Clear Aperture CA (mm):

4.50

Coating:

Laser V-Coat (1550nm)

Coating Specification:

R_abs <0.25% @ 1550nm

Diameter (mm):

5.00 +0.00/-0.25

Thickness (mm):

2.00 ±0.20

Design Wavelength DWL (nm):

1550

Parallelism (arcmin):

≤1

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

N-BK7

Surface Flatness:

λ/4

Surface Quality:

60-40

Type:

Laser Line Window

Young's Modulus (GPa):

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

Index of Refraction n_d:

1.516

Poisson's Ratio:

0.206

Abbe Number (v_d):

64.17

Edges:

Fine Ground

Regulatory Compliance

RoHS 2015:

Compliant

Reach 219:

Compliant

Product Family Description

<0.25% Reflection at Design Wavelength
Coatings Available for HeNe, Diode, and Nd:YAG Laser Sources
Precision N-BK7 Substrate
Also Available Uncoated, MgF₂ Coated and VIS 0° Coated

TECHSPEC® λ/4 N-BK7 Laser Line Windows are ideally suited for industrial and low power laser applications. The high tolerance design yields minimal beam distortion and scatter. Anti-reflection coatings provide <0.25% reflection at the coating's design wavelengths.

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