Purpose:
- is the main optical element for the extraction of a given wavelength in various spectral optical devices, such as monochromators and spectrographs, intended for scientific research and production needs;
- spatial spectral filtration of radiation.

Technologies used:
- technology of holographic production;
- technology of application and processing of photosensitive layers of bichromated gelatin.

Benefits:
- high maximum frequency of strokes;
- large maximum working surface size;
- absence of "spirits";
- low values ​​of polarization effects;
- the ability to work on both reflection and light transmission