75mm Dia., 4mm Thick, MgF2 Coated λ/4 N-BK7 Window

Abbe Number (v_d):

64.17

Bevel:

Protective as needed

Clear Aperture CA (mm):

67.50

Diameter (mm):

75.00 +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 211:

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
108.0mm Max Optic Dia., Jaw Clamp	#53-038	$549.00 Qty 5+ $494.25 Request Quote	In Stock ×
108.0mm Max Optic Dia., Jaw Clamp and 6" Kinematic Mount	#53-040	$825.00 Qty 5+ $783.75 Request Quote	In Stock ×
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	#03-666	$95.25 Qty 10+ $85.75 Request Quote	In Stock ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	#03-670	$86.75 Qty 10+ $78.25 Request Quote	In Stock ×
75.0/76.2mm Optic Dia., Optical Cell Assembly	#36-466	$131.25 Qty 10+ $118.25 Request Quote	In Stock ×
75.0/76.2mm Optic Dia., Optical Cell Kinematic Mount	#53-965	$370.00 Qty 10+ $359.00 Request Quote	In Stock ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	#16-078 New ×	$340.00 Qty 5+ $306.00 Request Quote	In Stock ×
75.0/76.2mm Optic Dia., E-Series Kinematic Mount	#15-868 New ×	$198.00 Qty 10+ $188.00 Request Quote	In Stock ×

75mm Dia., 4mm Thick, MgF₂ Coated λ/4 N-BK7 Window

Regulatory Compliance

Product Family Description

Need a Quote? Add a stock number to begin our two-step quote process.

Call Now! 1-800-363-1992