Magnesium Fluoride Windows

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Window Guide

Flat Window Selection Guide
Wavelength Range	Substrate Material
150 nm - 5.0 μm	Sapphire
180 nm - 8.0 μm	Calcium Fluoride (CaF₂)
185 nm - 2.1 μm	UV Fused Silica
200 nm - 6.0 μm	Magnesium Fluoride (MgF₂)
250 nm - 1.6 µm	UV Fused Silica, for 45° AOI
300 nm - 3 µm	Infrasil^®
350 nm - 2.0 μm	N-BK7
600 nm - 16 µm	Zinc Selenide (ZnSe)
1.2 - 8.0 μm	Silicon (Si)
2.0 - 16 μm	Germanium (Ge)
3 - 5 μm	Barium Fluoride (BaF₂)
V-Coated Laser Windows

Features

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

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 usable in the UVA, UVB, visible and IR ranges, with approximately 94% transmission from 200 - 1000 nm, and approximately 95% transmission from 1 - 6 µm.

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Window Selection Guide (Table Sorted by Wavelength)
Substrate and Window Type	Wavelength Range	Available AR Coatings	Reflectance over AR Coating Range^a	Transmission Data	Reflectance Data
Sapphire: Flat or Wedged	150 nm - 5.0 μm	Uncoated	-	Raw Data	-
		-D Coating, 1.65 - 3.0 µm	R_avg < 1.0% at 0° AOI	Raw Data	Raw Data
		-E1 Coating, 2.0 - 5.0 µm	R_avg< 1.50%, R_abs< 3.0% (per Surface, 2.0 - 5.0 µm); R_avg < 1.75% (per Surface, 2.0 - 4.0 µm) at 0° AOI	Raw Data	Raw Data
Calcium Fluoride (CaF₂): Flat or Wedged	180 nm - 8.0 μm	Uncoated	-	Raw Data	-
Calcium Fluoride (CaF₂): Flat or Wedged	180 nm - 8.0 μm	-D Coating, 1.65 - 3.0 µm	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
UV Fused Silica: Flat, Wedged, V-Coated Flat, or V-Coated Wedged	185 nm - 2.1 μm	Uncoated (Flat or Wedged)	-	Raw Data	-
		-UV Coating, 245 - 400 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C3 Coating, 261 - 266 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C6 Coating, 350 - 450 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-A Coating, 350 - 700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-B Coating, 650 - 1050 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C Coating, 1050 - 1700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
Magnesium Fluoride (MgF₂): Flat or Wedged	200 nm - 6.0 μm	Uncoated	-	Raw Data	-
Barium Fluoride (BaF₂): Wedged (Flat BaF₂ Windows Available Below)	200 nm - 11 µm	Uncoated	-	Raw Data	-
	200 nm - 11 µm	-E1 Coating, 2 - 5 µm	R_avg < 1.25%; R_abs < 2.5% at 0° AOI	Raw Data	Raw Data
UV Fused Silica, for 45° AOI: Flat or Wedged	250 nm - 1.6 µm	Coating for 250 nm - 450 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 350 nm - 1100 nm	R_avg < 2.0% at 45° AOI	Raw Data
		Coating for 400 nm - 700 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 600 nm - 1700 nm	R_avg < 1.5% at 45° AOI	Raw Data
		Coating for 700 nm - 1100 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 1200 nm - 1600 nm	R_avg < 1.0% at 45° AOI	Raw Data
Infrasil^®: Flat	300 nm - 3 µm	Uncoated	-	Raw Data	-
N-BK7: Flat, Wedged, V-Coated Flat, or V-Coated Wedged	350 nm - 2.0 μm	Uncoated (Flat or Wedged)	-	Raw Data	-
		-A Coating, 350 - 700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C7 Coating, 400 - 700 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C10 Coating, 523 - 532 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C11 Coating, 610 - 860 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-B Coating, 650 - 1050 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C13 Coating, 700 - 1100 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		C14 Coating, 1047 - 1064 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C15 Coating, 523 - 532 nm & 1047 - 1064 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C Coating, 1050 - 1700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
Zinc Selenide (ZnSe): Flat or Wedged	600 nm - 16 µm	Uncoated	-	Raw Data	-
		-D Coating, 1.65 - 3.0 µm	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-E4 Coating, 2 - 13 µm (Only Flat)	R_avg < 3.5%; R_abs < 6% at 0° AOI	Raw Data	Raw Data
		-E2 Coating, 4.5 - 7.5 µm (Only Flat)	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-E3 Coating, 7 - 12 µm (Only Wedged)	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-G Coating, 7 - 12 µm (Only Flat)	R_avg < 1% at 0° AOI	Raw Data	Raw Data
Silicon (Si): Flat or Wedged	1.2 - 8.0 μm	Uncoated	-	Raw Data	-
		-E1 Coating, 2 - 5 µm (Only Wedged)	R_avg < 1.25%; R_abs < 2.5% at 0° AOI	Raw Data	Raw Data
		-E Coating, 3 - 5 µm (Only Flat)	R_avg < 2% at 0° AOI	Raw Data	Raw Data
Germanium (Ge): Flat or Wedged	2.0 - 16 μm	Uncoated	-	Raw Data	-
		-C9 Coating, 1.9 - 6 µm (Only Flat)	R_avg < 2% at 0° AOI	Raw Data	Raw Data
		-G Coating, 7 - 12 µm (Only Flat)	R_avg < 1% at 0° AOI	Raw Data	Raw Data
		-E3 Coating, 7 - 12 µm (Only Wedged)	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
Barium Fluoride (BaF₂): Flat (Wedged BaF₂ Windows Available Above)	3 - 5 μm	-E Coating, 3 - 5 µm	R_avg < 2% at 0° AOI	Raw Data	Raw Data