Optical filter and method of manufacturing thereof

摘要: Novel structure of the optical elements (i.e. filter) to be operated in long, mid, and near infrared wavelengths lights is provided. The filter can offer very narrow linewidth, high reflectivity (or transmissivity) at peak wavelength. element consists substrate, first diffraction grating single uniform surface, second grating. Alternatively, again surface on top it. may also consist number sequence layers, wherein each comprises layer sandwiched by two layers. Filter alternatively sequences Diffraction two-step or multilevel with synchronously nonsynchronously samples gratings.