MgF2 Window

Magnesium Fluoride (MgF2) Windows offer excellent broadband transmission from the deep-UV to the mid-infrared. DUV transmission makes them ideal for use at the Hydrogen Lyman-alpha line and for UV radiation sources and receivers, as well as excimer laser applications. MgF2 is a rugged material resistant to chemical etching, laser damage, and mechanical and thermal shock. It has a Knoop Hardness of 415 and index of refraction of 1.38.

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Advantages

1 ) Excellent Transmission from 120nm to 7μm

2 ) Rugged and Durable

3 ) Resistant to Chemical Etching

Specifications

1 ) Diameter Tolerance: +/-0.2mm

2 ) Thickness Tolerance: +/-0.03mm

3 ) Aperture: >90%

4 ) Surface Quality: 80/50~10/5 (S/D)

5 ) Parallelism: <1 arc minute

6 ) Chamfer: 0.3-0.5mmx45°

Optical Properties

Transmission Range

0.12 to 7 micron

Refractive Index

1.413 at 0.22 micron

Refractive Loss

5.7% at 0.22 micron

Crystal/Class Structure

Tetragonal

Cleavage Plane

(100), (110), imperfect

Thermal Properties

Thermal Expansion

13.7 (para) 8.9 (perp) x10－6/K

Thermal Conductivity

21 (para) 33.6(perp) W m－1K－1  at 300K

Melting Point

1255℃

Specific Heat Capacity

1003 J Kg－1K－1

Mechanical Properties

Density

3.18 g/cc

Hardness (Knoop)

415

Youngs Modulus

138 GPa

Shear Modulus

54.66 GPa

Bulk  Modulus

101.32 GPa

Poisson Ratio

0.276

Elastic Limit

49.6 GPa (7200psi)

Molecular Weight

62.32

Chemical Properties

Solubility

0.0002g/100g water

Technical Images