Abstract
Real refractive index guided self-aligned (RISA) AlGaAs laser diodes have various advantages over conventional complex refractive index guided lasers, which include low operating current, stablefundamental transverse-mode operation up to high power levels, good controllability of current and optica distributions, and so on. In this review, the concept of RISA lasers and their applications to optical data storage systems are presented. Taking advantage of low operating current characteristics of the RISA lasers, a number of optical elements which compose a conventional optical pickup are successfully integrated into a very small plastic package, which results in substantial reduction of pickup size in various optical disk systems.
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