Laser diode white light source for a projector comprising: - at least first, second, and third laser diode matrices suitable for respectively delivering at least first, second, and third separate light bundles of wavelengths and determined dimensions from parallel light beams of each diode of said diode matrices: • a first dichroic plate suitable for forming a first combined light bundle from said first and second light bundles, and configured to allow said first light bundle of a first wavelength delivered by said first diode matrix to pass therethrough and to reflect said second light bundle of a second wavelength delivered by said second diode matrix to form said first combined light bundle; and • a second dichroic plate suitable for forming a second combined light bundle from said first combined light bundle and said third light bundle, and configured to allow said third light bundle of a third wavelength delivered by said third diode matrix to pass therethrough and to reflect said first combined light bundle to form said second combined light bundle; characterized in that it further comprises: - an off-axis parabolic mirror for receiving said second combined light bundle and focusing it on a determined focal point corresponding to an inlet point for a single optical fiber, and - a polarizing filter configured to allow said second light bundle of said second wavelength to pass therethrough and to reflect a fourth light bundle of said second wavelength delivered by a fourth diode matrix to form a combined light bundle going to said first dichroic plate. - at least first, second, and third laser diode matrices suitable for respectively delivering at least first, second, and third separate light bundles of wavelengths and determined dimensions from parallel light beams of each diode of said diode matrices: • a first dichroic plate suitable for forming a first combined light bundle from said first and second light bundles, and configured to allow said first light bundle of a first wavelength delivered by said first diode matrix to pass therethrough and to reflect said second light bundle of a second wavelength delivered by said second diode matrix to form said first combined light bundle; and • a second dichroic plate suitable for forming a second combined light bundle from said first combined light bundle and said third light bundle, and configured to allow said third light bundle of a third wavelength delivered by said third diode matrix to pass therethrough and to reflect said first combined light bundle to form said second combined light bundle; • a first dichroic plate suitable for forming a first combined light bundle from said first and second light bundles, and configured to allow said first light bundle of a first wavelength delivered by said first diode matrix to pass therethrough and to reflect said second light bundle of a second wavelength delivered by said second diode matrix to form said first combined light bundle; and • a second dichroic plate suitable for forming a second combined light bundle from said first combined light bundle and said third light bundle, and configured to allow said third light bundle of a third wavelength delivered by said third diode matrix to pass therethrough and to reflect said first combined light bundle to form said second combined light bundle; - an off-axis parabolic mirror for receiving said second combined light bundle and focusing it on a determined focal point corresponding to an inlet point for a single optical fiber, and - a polarizing filter configured to allow said second light bundle of said second wavelength to pass therethrough and to reflect a fourth light bundle of said second wavelength delivered by a fourth diode matrix to form a combined light bundle going to said first dichroic plate.