The modeling of optical diffusers is always a challenging task to optical designers. Most commercially available optical design programs can incorporate measured BSDF data to create a reliable diffuser model.

BSDF data records scatter information at various angles of incidence to generate a representation in the modeling program that can then be used to determine how rays propagate through the diffuser.

VIAVI is pleased to announce that BSDF data for many of its Engineered Diffuser™ products are available to optical designers for modeling diffuser behavior in their system models. Measured BSDF data for angles of incidence up to 20 degrees are currently available for circular and square scatter patterns. Line diffusers and HiLam™ diffusers have been designed, measured and modeled for use with collimated illumination at normal incidence. BSDF data are supplied in the following formats:

BSDF File Downloads

Note to Zemax and OpticStudio users:
VIAVI has measured BSDF data for both isotropic and anisotropic Engineered Diffusers™ over a range of Sample Rotations and Angles of Incidence. Zemax formatted BSDF data files are provided in two formats – Tabular BSDF and DLL BSDF.

Tabular BSDF data is provided for a single Sample Rotation of 0 degrees and at normal incidence, i.e. AOI of 0 degrees. DLL BSDF data is provided over a range of Sample Rotations and Angles of Incidence. The HiLam BSDF data is only provided as Tabular BSDF data.

The Tabular BSDF data and DLL BSDF use different Zemax lens data input and analysis routines. The BSDF data for Zemax have been tested with Zemax OpticStudio16 SP1 Professional (64-bit) Version June 08, 2016. Questions related to the use and validity of analysis of the BSDF data should be directed to Zemax, LLC.

The BSDF data provided are from measurements of representative diffuser samples. Actual scatter distributions may vary from diffuser to diffuser.

BSDF data

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