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Optical phase-conjugate feedback effects on gain-guided diode laser characteristics

1989; IEEE Photonics Society; Volume: 25; Issue: 3 Linguagem: Inglês

10.1109/3.18572

1558-1713

Yves Champagne, Nathalie McCarthy, R. Tremblay,

Advanced Fiber Laser Technologies

The effects of optical phase-conjugate feedback on the characteristics of stripe-geometry gain-guided GaAlAs lasers are theoretically investigated using a model based on the beam-propagation method. Compared to standard diode lasers, the use of a phase-conjugate mirror yields lower threshold currents and improves the optical quality of the output beam over a wide range of stripe widths and cavity lengths. The results obtained for 3 mu m stripe lasers are particularly noteworthy since the twin-peaked far field of standard lasers can become single lobed. Moreover, when one cleaved facet is replaced by a phase-conjugate mirror having the same overall reflectivity, the threshold current can be reduced by more than 50% for short cavity lengths. >