Features

• T ≥ 94% for λ = 200 nm to 6 μm
• >50% Transmission at 120 nm
• Ø1/2" and Ø1" Versions Available
• MgF₂ Substrate

Thorlabs' Magnesium Fluoride windows are available in Ø1/2" and Ø1" sizes. They offer excellent transmission from deep in the ultraviolet region to the mid-infrared. MgF₂ windows are extremely durable and introduce minimal aberrations. Thorlabs' MgF₂ windows are cut with the optical axis parallel to the c-axis of the crystal to minimize birefringence.

MgF₂ windows are well suited for deep-UV applications, even extending into the vacuum-UV region. They offer >50% transmission at 120 nm, making them suitable for use with excimer laser systems, as well as applications involving the Hydrogen Lyman-α line at 121 nm. Thorlabs' MgF₂ windows are also useable in the UVA, UVB, visible and IR ranges, with approximately 94% transmission from 200 - 1000 nm, and approximately 95% transmission from 1 - 6 µm.