A laser diode (LD) is used for a laser texture apparatus to form bumps on the Ni-P plated aluminum substrate for hard disks. The laser diode module of the apparatus comprises a LD, a collimator lens, ...

A recognized drawback of edge-emitting diode lasers is their high divergence and elliptical beam shape since the first diode laser was demonstrated. In this paper, we demonstrated the ultranarrow ...