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A technique for improvement of the beam profile of a LD array by an external cavity with self pumped photorefractive phase conjugate mirror is presented. A spatially filtered part of the far field from the negative lobe of a gain guided LD array is directly coupled to a phase conjugating rhodium doped barium titanate crystal. The positive lobe power increases remarkably at low drive current. Beam energy increases significantly at emission angle centered close to 2.3°at different drive current. A large fraction of power in the positive lobe is contained in a Gaussian spike of width 1.34× diffraction limit (FWHM of the far field is 0.75°).
A technique for improvement of the beam profile of a LD array by an external cavity with self pumped photorefractive phase conjugate mirror is presented. A spatially filtered part of the far field from the negative lobe of a gain guided LD array is directly coupled to a phase The positive lobe power increased remarkably at low drive current. Beam energy increases significantly at emission angle centered close to 2.3 ° at different drive current. A large fraction of power in the positive lobe is contained in a Gaussian spike of 1.34 × diffraction limit (FWHM of the far field is 0.75 °).