Abstract
Thickness and refractive index of waveguide layer have major effects in the electro-optical characteristics of diode lasers. In this research, ordinary step refractive index profile was replaced by broadened waveguide with suitable linear, parabolic and Gaussian profile refractive index. The results show such design can significantly improve the vertical divergence, decrease threshold current and increase laser brightness. According to these results by using Gaussian profile, the brightness and optical power can be increased to 56% and 27% respectively higher than those in step profile.
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