Why don't lasers spread like white light?

Lasers do spread the same way that white light does, governed by the laws of diffraction. read more

Lasers do spread the same way that white light does, governed by the laws of diffraction. Lasers, however, are generally configured so that the light that they create emerges from the laser in a relatively small source aperture, and with a fairly narrow range of angles to the emerging rays. read more

A laser is able to be focused to a very tight spot for a number of reasons, one of which is that the light produced by a laser is highly monochromatic, i.e. it has a single frequency. This means that the normal chromatic problems with white light go away. read more