Mahmood: I have sourced laser diodes from most of my semiconductor sources, but they were always expensive so I never used them for my projects. During my research I came across the definition of a wise laser engineer: One that does not look at the laser with his(her) remaining good eye.
They are potentioaly very dangerous above about 5 mw. both direct and reflected beams are dangerous so please take suitable precautions. be safe Terry