How to use a laser pointer to light up paint?

Although we have reviewed the unlimited use of Laser pointer many times, we have not really completed the tutorial on how to use our laser. You may be familiar with light painting, a photographic technique that uses long exposures and light sources to create design and movement in photos. If not, you may have seen a long-exposure photo-you know, those photos with bright colors, streaks of light, and almost surrealistic appearances? The laser beam passes through the laser pointer output mirror, which is equivalent to diffraction and produces a Gaussian beam. Along the propagation direction, its spot spreads according to a hyperbola. The farther the distance, the larger the spot. The angle corresponding to the asymptotic line of the curve) characterizes, which has nothing to do with distance.