Maximum Detection Efficiency for Photon Counters
To perform a fiber coupling, additional optical elements are needed. In COUNT modules with FC connectors a special GRIN lens is integrated that images single photons from the fiber onto the detector chip. With the in-house IBS coater, LASER COMPONENTS optimizes the lenses with a double-sided AR coating. This broadband coating from 400 nm - 1100 nm has a reflection of less than 1.5%, and has thus led to a reduction in losses in detection efficiency.
Because of the in-house production, we are able to customize the coatings. For example, we can offer AR coatings with a reflection of <<1% in the range from 400 nm to 900 nm or from 600 nm to 1100 nm.
For COUNTblue modules with increased sensitivity in the blue to yellow spectral range, we designed a special AR coating option that has a reflection of less than 1% from 350 nm to 700 nm.