Quarter-wave mirror: Estimation of reflectance at the central wavelength, width of high-reflection zones, and angular shift
Fig. 1. Schematic representation of the reflectance of a quarter-wave mirror (Bragg mirror) with the central wavelength of \(\lambda_0\).
High-reflection (HR) zones of quarter-wave mirrors are spectral ranges, where reflectance is high and is growing if the number of layer pairs if increasing. The HR zones around the mirror central wavelength \(\lambda_0\) is called principal or the first HR zone. The second, third, etc., HR zones are centered around \(\lambda_0/3\), \(\lambda_0/5\), ... wavelengths. With the growing of order, the HR zones are getting narrower.
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