Extremely low bulk scatter and autofluorescence
Available in high flatness Λ/20 or general purpose Λ/10
<30 arc-second parallelism
Fine, low scatter surface up to 10-5 scratch-dig
Broadband AR coatings for UV, visible or IR applications
UV Fused Silica Windows feature low distortion, excellent parallelism, low bulk scattering, and fine surface quality. This makes them perfectly suited for a wide variety of demanding applications, including multiphoton imaging systems, and intracavity laser applications.
UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity providing maximum transmission from 195 to 2100 nm. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. It will not fluoresce under UV light and is resistant to radiation. For high-energy applications, the extreme purity of fused silica eliminates microscopic defect sites that could lead to laser damage.
Five anti-reflection coatings are available on both sides of the window, covering the spectrum range from 245 nm to 1550 nm.
Compared with other optical glasses like N-BK7, UV Fused Silica has very low autofluoresence and scattering.
| Series | FSW series |
|---|---|
| Material | UV Grade Fused Silica |
| Surface Flatness | λ/10 @ 632.8 nm |
| Surface Quality | 20-10 scratch-dig |
| Clear Aperture | Central 80% of diameter |
| Wedge | Less than 5 arc seconds |
| Diameter Tolerance | +0.0/-0.2 mm |
| Thickness Tolerance | ± 0.1 mm |
| Parallelism | <5 arc seconds |
| Antireflection Coating |
AR.10: < 0.5% @ 370-420 nm, <0.75% @ 250-425 nm AR.14: < 0.4% @ 425-675 nm AR.15: < 1.5% @ 250-700 nm, < 1.0% @ 350-450 nm |
| Cleaning |
Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (see How to Clean Optics) |
| Damage Threshold | 1 J/cm2 with 10 ns pulses @ 1064 nm |
| Model | Material | Surface Flatness(1) | Surface Quality |
Diameter (mm) |
Thickness (mm) |
|---|---|---|---|---|---|
| 05QW40-30 | UV Grade Fused Silica | λ/20 @ 632.8 nm | 10-5 | 12.7 | 6.0 |
| 10QW40-30 | UV Grade Fused Silica | λ/20 @ 632.8 nm | 10-5 | 25.4 | 6.0 |
| 20QW40-30 | UV Grade Fused Silica | λ/20 @ 632.8 nm | 10-5 | 50.8 | 10.0 |
1) Surface flatness measured at 632.8 nm over the clear aperture
| Dimension (mm) | ||
|---|---|---|
| Model | øA | B |
| 05QW | 12.7 | 6.0 |
| 10QW | 25.4 | 6.0 |
| 20QW | 50.8 | 10.0 |
| FSW10 | 5.0 | 1.0 |
| FSW11 | 10.0 | 1.3 |
| FSW12 | 12.5 | 1.5 |
| FSW13 | 15.0 | 2.0 |
| FSW14 | 20.0 | 2.0 |
| FSW15 | 25.0 | 3.0 |
| FSW16 | 30.0 | 4.0 |
| FSW17 | 40.0 | 4.0 |
| FSW18 | 50.0 | 5.0 |