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See all 206 Products in Family

TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

50mm Dia., 4mm Thick, MgF₂ Coated λ/4 N-BK7 Window

Stock #45-584

£72.25 Other Coating Options

Qty 1-5
£72.25

Qty 6+
£57.80

Volume Pricing
Request Quote

Curves eDrawings: eprt IGES PDF Drawings STEP: step

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Abbe Number (v_d):

64.17

Bevel:

Protective as needed

Clear Aperture (%):

Clear Aperture CA (mm):

45.00

Diameter (mm):

50.00 +0.0/-0.25

Thickness (mm):

4.00 ±0.20

Coating:

MgF₂ (400-700nm)

Coating Specification:

R_avg ≤1.75% @ 400 - 700nm

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 (arcmin):

≤1

Poisson's Ratio:

0.206

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:

Protective Window

Typical Energy Density Limit:

10 J/cm² @ 532nm, 10ns

Wavelength Range (nm):

400 - 700

Young's Modulus (GPa):

Regulatory Compliance

RoHS 2015:

Compliant

REACH 201:

Compliant

Product Family Description

λ/4 Surface Flatness
Broadband Anti-Reflection Coating Options Available
Custom Coatings and Sizes Available for Volume OEM Quantities
Also Available with Laser Line V-Coats

TECHSPEC® λ/4 N-BK7 Precision Windows are ideally suited for industrial and low power laser applications. The high tolerance design yields minimal beam distortion and scatter. Broadband coating options extend the range of these precision windows through the visible and near-infrared spectra.

Title	Stock Number	Price	Buy
50.0/50.8mm Optic Dia., Precision Gimbal Mount	#55-000	£359.13 Qty 5+ £323.21 Request Quote	2-3 days ×
50.0mm Optic Dia., Kinematic Mirror Mount	#55-004	£200.60 Request Quote	2-3 days ×
50.0/50.8mm Optic Dia., Kinematic Mirror Mount	#55-005	£250.75 Request Quote	2-3 days ×
50.0mm Optic Dia., Kinematic Mirror Mount with Micrometer	#55-457	£214.20 Request Quote	In Stock ×
50.0/50.8mm Optic Dia., Kinematic Mirror Mount with Micrometer	#56-326	£267.75 Request Quote	In Stock ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	#03-666	£80.96 Qty 10+ £72.89 Request Quote	In Stock ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	#03-669	£77.56 Qty 10+ £69.91 Request Quote	2-3 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	#55-530	£77.56 Qty 10+ £69.91 Request Quote	In Stock ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	#03-670	£73.74 Qty 10+ £66.51 Request Quote	2-3 days ×
9.5 - 73.0mm Optic Dia., Three-Screw Adjustable Ring Mount	#36-605	£54.19 Qty 10+ £48.88 Request Quote	In Stock ×
50.0/50.8mm Optic Dia., Optical Cell Assembly	#36-465	£84.79 Qty 10+ £76.50 Request Quote	2-3 days ×
50.0/50.8mm Optic Dia., Kinematic Mount, 2-Screws	#58-852	£101.15 Qty 5+ £91.16 Request Quote	In Stock ×
50.0/50.8mm Optic Dia., Kinematic Mount, 3-Screws	#58-855	£118.15 Qty 5+ £106.46 Request Quote	In Stock ×
50.0mm Optic Dia., Optic Mount	#64-567	£42.50 Qty 10+ £38.25 Request Quote	In Stock ×
50.0mm Optic Dia., Optic Mount	#64-568	£42.50 Qty 10+ £38.25 Request Quote	2-3 days ×
50.0/50.8mm Optic Dia., 5 Axes Optical Mount	#13-778	£582.25 Qty 5+ £553.14 Request Quote	In Stock ×
50.0/50.8mm Optic Dia., X-Y Translating Optic Mount	#62-957	£213.14 Qty 5+ £202.51 Request Quote	2-3 days ×
50.0/50.8mm Optic Dia., X-Y-Z Translating Optic Mount	#62-960	£420.75 Qty 5+ £399.71 Request Quote	2-3 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	#16-078 New ×	£289.00 Qty 5+ £260.10 Request Quote	2-3 days ×
50.0/50.8mm Optic Dia., E-Series Kinematic Mount	#15-867 New ×	£59.90 Qty 10+ £56.90 Request Quote	2-3 days ×