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AR-Coated, N-BK7 Ground Glass Diffusers
AR-Coated Transfusers Provide Enhanced Transmission Compared to Their Uncoated Counterparts
Thorlabs' AR-Coated N-BK7 Ground Glass Diffusers can be used in a variety of applications requiring a diffuse Gaussian-like distribution. They are offered in 120, 220, 600, and 1500 grit polishes with an AR coating deposited on both sides for either 350 - 700 nm or 650 - 1050 nm. These diffusers offer improved transmission over their uncoated counterparts (see the Graphs Tab for more details).
Polished diffusers are advantageous over sand blasted diffusers, as the surface has greater uniformity. The various grits provide a range from fine to coarse scattering. A finer grit (e.g., 1500) allows higher transmission, while a coarser grit (e.g., 120) creates a wider diffusion pattern at the expense of transmission. When mounting the diffusers, the grit polished side should face away from the source.
For applications requiring specific divergence angles, spatial distribution of the illumination, and intensity profiles, our engineered diffusers are more suitable. Thorlabs also offers UV Fused Silica Diffusers for applications that extend into the ultraviolet portion of the spectrum.
The coated diffusers offer increased transmission over their uncoated counterparts, which are represented by the blue curves in the graphs below. The blue-shaded region represents the wavelength range over which the AR coating is specified. The -A coating is specified for 350 - 700 nm and the -B coating for 650 - 1050 nm. 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.