A real-index guided InGaAlP visible laser diode with a small beam astigmatism

A real-index guided InGaAlP visible laser diode with a small beam astigmatism has been developed. The structure, fabrication process, and optical properties of the laser are described. The laser is characterized by a slab-coupled waveguide structure with self-aligned current confinement. The laser was fabricated with a two-step metalorganic chemical vapor deposition (MOCVD) process. The laser exhibited stable fundamental transverse mode oscillation with a threshold current as low as 40 mA and a lasing wavelength of 670 nm. As a result of real-index guiding, a small beam astigmatism less than 2 mu m has been achieved. The laser exhibited a stable operation for 2000 h under 3 mW at 30 degrees C.<
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