What is the formula used to calculate reflectivity for bragg mirror?

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Raymond Rumpf

The page you provided describes them just below the equation for R. no is the refractive index of the medium the wave is present in before it hits the Bragg grating. Inside the grating, the refractive index alternates between n1 and n2. When the wave leaves the grating, it is in a medium with refractive index ns.

Taha A. Ali

Raymond Rumpf is correct. I suggest to read the following article that states that law "Approximate calculation of the reflection coefficient from a stratified medium".

Sherif El-Gohary

Dear check this paper:

http://www.ulp.ethz.ch/content/dam/ethz/special-interest/phys/quantum-electronics/ultrafast-laser-physics-dam/publications_awards/publications/1995-1984/040__OC_116__343__1995_.pdf