| Abstract: | 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°). |
