AR coatings 
HR coatings 
Stresses 
Mid-infrared dispersive mirrors 
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.
Here you can estimate reflectance at central wavelength and width of HR zones of quarter-wave mirrors of different structures (s-polarization case). Please input parameters required for calculations.
Refractive indices of layer materials and substrate (min. values 1.0):
nH = nL = ns = Angle of incidence AOI (0-89.9): degreesCentral wavelength (100-25000 nm): = nm Number of layer pairs (min. 5): =
