Abstract: A laser light source for producing incoherent laser beams, in particular for speckle-free imaging and/or projection, with at least two different wavelengths, preferably with three different wavelengths, includes: at least two optical devices, in particular at least two optical parametric oscillators, which each have a nonlinear optical medium for respectively producing a signal beam and an idler beam, and a superposition device configured to respectively superpose either the signal beam or the idler beam of each of the at least two optical devices for producing an incoherent laser beam with the at least two different wavelengths. A laser projector for producing an image, in particular a speckle-free image, on a projection surface, can include such a laser light source.

Abstract: A sensor arrangement characterizes particles. The arrangement has an emitter with a laser source that generates a laser beam; a mode converter that generates a field distribution of the laser beam, which at each position has a different combination of a local intensity and a local polarization direction of the laser beam; and focusing optics that focus the field distribution of the laser beam onto at least one measurement region, through which the particles pass, in a focal plane. A receiver is also provided with analyzer optics configured to determine polarization-dependent intensity signals of the field distribution of the laser beam in the at least one measurement region; and an evaluator configured to characterize the particles, including the particle position, the particle velocity, the particle acceleration, or the particle size, using the polarization-dependent intensity signals.