Determining the refractive index of a laser diode waveguide from the measured radiation pattern 
Date: Feb 1, 2018
It is shown that to find the transverse refractive-index profile of a semiconductor laser waveguide, it is sufficient to know the angle of the device’s radiation divergence and two values of the function describing the directional radiation pattern. A calculation technique is proposed and its use in the diagnostics of laser diode degradation is discussed.