Products HomeMagnesium Fluoride Windows
- >50% Transmission at 120 nm
- Transmission ≥94% for λ = 200 nm - 6 µm
- Extremely Durable Ø1/2" and Ø1" Windows Available
- Suitable for Excimer Lasers and Other Deep UV Applications
WG61050
Ø1"
WG60530
Ø1/2"
Please Wait
| 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 |
| 250 nm - 26 µm | Potassium Bromide (KBr) |
| 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) |
| 2 - 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.
| Posted Comments: | |
Enrique Vasco
(posted 2020-10-03 15:11:52.777) Please, could you provide me with data on MgF2 window damage thresholds for 10 ns-pulsed UV laser, as the product description specifies that it is suitable for excimer laser and deep UV applications? Thankx YLohia
(posted 2020-10-07 02:30:18.0) Thank you for contacting Thorlabs. Unfortunately, we don't test or specify LIDT for bulk optics. Based on your beam parameters (266 nm, 100 mJ, 8 ns, 10 Hz, 3mm) and the literature available online, we expect the WG60530 to not sustain damage, but we cannot provide any guarantees for this at the moment. |
| Window Selection Guide (Table Sorted by Wavelength) | |||||
|---|---|---|---|---|---|
| Substrate and Window Type | Wavelength Range | Available AR Coatings | Reflectance over AR Coating Rangea | Transmission Data | Reflectance Data |
| Sapphire: Flat or Wedged |
150 nm - 5.0 μm | Uncoated | - |  Raw Data |
- |
| -D Coating, 1.65 - 3.0 µm | Ravg < 1.0% at 0° AOI |  Raw Data |
 Raw Data |
||
| -E1 Coating, 2.0 - 5.0 µm | Ravg < 1.50%, Rabs < 3.0% (per Surface, 2.0 - 5.0 µm); Ravg < 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 |
- |
| -D Coating, 1.65 - 3.0 µm | Ravg < 1.0%; Rabs < 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) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C3 Coating, 261 - 266 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C6 Coating, 350 - 450 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -A Coating, 350 - 700 nm (Flat or Wedged) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -B Coating, 650 - 1050 nm (Flat or Wedged) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C Coating, 1050 - 1700 nm (Flat or Wedged) |
Ravg < 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 |
- |
| -E1 Coating, 2 - 5 µm | Ravg < 1.25%; Rabs < 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 |
Ravg < 1.0% at 45° AOI |  Raw Data |
|
| Coating for 350 nm - 1100 nm |
Ravg < 2.0% at 45° AOI |  Raw Data |
|||
| Coating for 400 nm - 700 nm |
Ravg < 1.0% at 45° AOI |  Raw Data |
|||
| Coating for 600 nm - 1700 nm |
Ravg < 1.5% at 45° AOI |  Raw Data |
|||
| Coating for 700 nm - 1100 nm |
Ravg < 1.0% at 45° AOI |  Raw Data |
|||
| Coating for 1200 nm - 1600 nm |
Ravg < 1.0% at 45° AOI |  Raw Data |
|||
| Potassium Bromide (KBr): Flat |
250 nm - 26 µm | Uncoated | - |  |
- |
| 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) |
Ravg < 0.5% at 0° AOI | - | Raw Data |
||
| -C7 Coating, 400 - 700 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C10 Coating, 523 - 532 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C11 Coating, 610 - 860 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -B Coating, 650 - 1050 nm (Flat or Wedged) |
Ravg < 0.5% at 0° AOI | - | Raw Data |
||
| -C13 Coating, 700 - 1100 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| C14 Coating, 1047 - 1064 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C15 Coating, 523 - 532 nm & 1047 - 1064 nm (V-Coated) |
Ravg < 0.5% at 0° AOI | - |  Raw Data |
||
| -C Coating, 1050 - 1700 nm (Flat or Wedged) |
Ravg < 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 | Ravg < 1.0%; Rabs < 2.0% at 0° AOI |  Raw Data |
 Raw Data |
||
| -E4 Coating, 2 - 13 µm (Only Flat) |
Ravg < 3.5%; Rabs < 6% at 0° AOI |  Raw Data |
 Raw Data |
||
| -E2 Coating, 4.5 - 7.5 µm (Only Flat) |
Ravg < 1.0%; Rabs < 2.0% at 0° AOI |  Raw Data |
 Raw Data |
||
| -E3 Coating, 7 - 12 µm (Only Wedged) |
Ravg < 1.0%; Rabs < 2.0% at 0° AOI |  Raw Data |
 Raw Data |
||
| -G Coating, 7 - 12 µm (Only Flat) |
Ravg < 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) |
Ravg < 1.25%; Rabs < 2.5% at 0° AOI |  Raw Data |
Raw Data |
||
| -E Coating, 3 - 5 µm (Only Flat) |
Ravg < 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) |
Ravg < 2% at 0° AOI |  Raw Data |
 Raw Data |
||
| -G Coating, 7 - 12 µm (Only Flat) |
Ravg < 1% at 0° AOI |  Raw Data |
Raw Data |
||
| -E3 Coating, 7 - 12 µm (Only Wedged) |
Ravg < 1.0%; Rabs < 2.0% at 0° AOI |  Raw Data |
Raw Data |
||
| Barium Fluoride (BaF2): Flat (Wedged BaF2 Windows Available Above) |
2 - 5 μm | -E Coating, 2 - 5 µm | Ravg < 1.25% at 0° AOI |  Raw Data |
 Raw Data |
Zoom| Item # | WG60530 | WG61050 |
|---|---|---|
| Diameter | 1/2" (12.7 mm) | 1" (25.4 mm) |
| Diameter Tolerance | +0.0 / -0.2 mm | |
| Thickness | 3.0 mm | 5.0 mm |
| Thickness Tolerance | ±0.3 mm | |
| Clear Aperture | >90% Diameter | |
| Axis Orientation | ±0.5° | |
| Parallelism | ≤5 arcmin | |
| Surface Flatnessa | λ/8 over Clear Aperture | |
| Surface Quality | 20-10 Scratch-Dig | |
| Wavelength Range | 200 nm - 6.0 μm (Uncoated) | |
| Substrate | Magnesium Fluorideb | |
| Transmission Data | Raw Data |
|
Additional Flat Windows
Magnesium Fluoride Windows, 0.2 - 6 µm