UV Fused Silica Ground Glass Diffusers
- Superior Transmission in UV Range
- Offered in 120, 220, 600, and 1500 Grit Polishes
- Polished for Greater Uniformity than Sand Blasting
DGUV10-600 Mounted in KB1P Quick-Release Mount
|Diffuser Selection Guide|
|Ground Glass Diffusers|
|Standard Diffusers||N-BK7 Substrate||Unmounted, Uncoated||350 nm to 2.0 µm|
|Unmounted, AR Coated||350 nm - 700 nm
650 nm - 1050 nm
|Mounted, Uncoated||350 nm - 2.0 µm|
|UVFS Substrate||Unmounted, Uncoated||185 nm - 2.0 µm|
|Diffuse Reflectors||N-BK7 Substrate||Unmounted, UV-Enhanced Aluminum Coated||250 nm - 450 nm|
|Unmounted, Protected Silver Coated||450 nm - 20 µm|
|Unmounted, Protected Gold Coated||800 nm - 20 µm|
- Ø1" Round Diffusers
- UV Fused Silica Substrate
- Greater than 90% Transmission Above 225 nm
- Gaussian Spatial Profile
- Clear Aperture: >90% Diameter
Thorlabs' UV Fused Silica Ground Glass Diffusers produce a Gaussian intensity profile from an input light source. Unlike our diffusers based on N-BK7 substrates, UV fused silica is highly transmissive at wavelengths below 350 nm. In addition, UV fused silica exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications in a range spanning the ultraviolet to the near infrared. See the Comparison tab for a side-by-side comparison of the wavelength-dependent transmission of N-BK7 and UV fused silica.
These diffusers feature 120, 220, 600, or 1500 grit polishes. Our polishing process results in a surface with significantly greater uniformity than sandblasted diffusers. The various grits provide a range from fine to coarse scattering. A finer grit (e.g. 1500) has a small diffusion pattern, while a coarser grit (e.g. 120) will have a larger diffuser pattern. See the plot to the right to compare the performance of our diffusers and the Graphs tab to see the transmission through the diffusers.
When mounting the diffusers, the grit polished side should face away from the source. Thorlabs offers fixed lens mounts to hold these diffusers.
If transmission in the ultraviolet range is not necessary for your application, please consider our line of N-BK7 Ground Glass Diffusers.
|Diameter Tolerance||+0.00/-0.25 mm|
|Thickness Tolerance||±0.2 mm|
|Clear Aperture||>90% Diameter|
|Surface Flatness of Smooth Side|
(@ 633 nm)
|Surface Quality of Smooth Side||80-50 Scratch-Dig|
Please note that the transmission values are affected by the manner in which the data is collected. An integrating sphere is used along with a spectrometer, and as the grit values get smaller the light is more dispersed, making it difficult to collect all of the light into the spectrometer. Therefore, lower grit values will appear to have a lower transmission.
Comparison of N-BK7 and UV Fused Silica
N-BK7 is a popular substrate because of its low cost and excellent transmission in the visible and near-infrared portions of the spectrum. However, its transmission drops off sharply at wavelengths shorter than 350 nm. For applications in the ultraviolet portion of the spectrum, UV fused silica is a superior alternative. UV fused silica offers high transmission deep into the ultraviolet, good homogeneity, and a lower coefficient of thermal expansion than N-BK7. In addition, UV fused silica exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications from the UV to the near IR. See the graph to the right for a comparison between N-BK7 and UV fused silica.
Thorlabs also offers N-BK7 Ground Glass Diffusers for applications where UV transmission is not a requirement.