LASER LIGHT SOURCE AND LASER PROJECTOR WITH OPTICAL DEVICES FOR REDUCING SPECKLE NOISE, AND METHOD FOR OPERATING SUCH A LASER LIGHT SOURCE AND SUCH A LASER PROJECTOR

摘要

The invention relates to a laser light source (1a) for producing a laser beam (2), in particular for speckle-free imaging and/or a speckle-free projection, with at least two, preferably three, different wavelengths (λ_R, λ_G, λ_B), said laser light source comprising: at least two optical devices, in particular at least two optical parametric oscillators (5a-c), which each have a nonlinear optical medium (6a-c) for producing, in each case, a signal beam (S1, S2, S3) and an idler beam (I1, I2, I3), and a superposition device (4), which is embodied, in each case, to superpose either the signal beam (S1, S2, S3) or the idler beam (I1, I2, I3) of the at least two optical devices (5a-c) for the purposes of producing the laser beam (2) with the at least two wavelengths (λ_R, λ_G, λ_B). The invention also relates to a laser projector for producing an image, in particular a speckle-free image, on a projection surface, said laser projector having such a laser light source (1a).