Our Holographic Notch and SuperNotch® Filters are fabricated by recording interference patterns formed between two mutually coherent laser beams unlike conventional interference filters, which are made by vacuum evaporation techniques. Since all layers are recorded simultaneously within a thick stack, the optical density of the notch filter is high and its spectral bandwidth can be extremely narrow. Also, since the layering profile is sinusoidal instead of squarewave, holographic notch filters are free from extraneous reflection bands and provide significantly higher laser damage thresholds.
