Systems and methods for managing incoherent laser beams

A laser projector for producing an image with reduced speckle noise on a projection surface, the laser projector comprising:

• a laser light source comprising:
• at least three optical devices each comprising a respective optical parametric oscillator having an optical resonator and a nonlinear optical medium arranged in the optical resonator for producing a respective signal beam and a respective idler beam from a respective pump beam, wherein a frequency of the respective pump beam is identical to a sum of a frequency of the respective signal beam and a frequency of the respective idler beam;
• and
• a superposition device coupled to the at least three optical devices and configured to spatially superpose only one of the respective signal beam and the respective idler beam produced by each of the at least three optical devices to produce an incoherent laser beam having at least three different wavelengths;
• and
• a scanner arranged to provide a two-dimensional deflection of the incoherent laser beam to produce the image on the projection surface.

A method comprising:

• producing a first signal beam and a first idler beam by a first optical device of at least three optical devices in a laser light source, each of the at least three optical devices comprising a respective optical parametric oscillator having an optical resonator and a nonlinear optical medium arranged in the optical resonator for producing a respective signal beam and a respective idler beam from a respective pump beam, wherein a frequency of the respective pump beam is identical to a sum of a frequency of the respective signal beam and a frequency of the respective idler beam;
• producing a second signal beam and a second idler beam by a second optical device of the at least three optical devices in the laser light source;
• producing a third signal beam and a third idler beam by a third optical device of the at least three optical devices in the laser light source;
• and
• spatially superposing only one of the first signal beam and the first idler beam, only one of the second signal beam and the second idler beam, and only one of the third signal beam and the third idler beam to obtain an incoherent laser beam having at least three different wavelengths,
• wherein the only one of the first signal beam and the first idler beam has a first wavelength of the at least three different wavelengths, the only one of the second signal beam and the second idler beam has a second wavelength of the at least three different wavelengths, the second wavelength being different from the first wavelength, and the only one of the third signal beam and the third idler beam has a third wavelength of the at least three different wavelengths, the third wavelength being different from the first wavelength and the second wavelength.