WFSS Grisms Blaze Function

The WFSS mode uses two grisms manufactured by Bach Corporation. These are resin replicated gratings, i.e. a large custom-made master aluminum grating is first replicated on a smaller sub-master. In turn, that sub-master grating is pressed on the resin-covered prism substrate and allowed to solidify. Our substrates are prisms made in Infrasil 301, a fused silica IR glass. We measured the blaze function (the grism’s transmission) of a representative engineering-grade grating at ambient temperature in the lab at UdeM.

GR150 Blaze Function as measured at UdeM on the “Fligh-Like” engineering part. Measurements were done at ambient temperature. A scaled PC Grate model is fitted. The model is based on groove shape measurements obtained using Atomic Force Microscopy.  GR150 Blaze Function (pdf)  – GR150 Blaze Function (ASCII)