Extracting effective reflectivity at AR coated diode facets using graphical analysis method

In terms of graphical analysis method,the effective reflectivity of antireflection film deposited on the facet of semiconductor laser diode has been studied.The results show,if the spectral width of reflective curve of the antireflective film is finite,the reflectivity is generally greater than the minimum of reflectivity curve.It is possible to minimize the effective reflectivity through carefully choosing the wavelength at which the reflectivity curve reaches its minimum.