The laser in the laser pointer is the light emitted during the energy conversion process after the particles around the atom are excited by photons. It has the characteristics of high brightness, high directivity, high monochromaticity and high coherence. The beam can be precisely focused on the focal point and produce high power density, thereby generating high temperature near the focal point, that is, the thermal effect of the laser.
Laser is a light source invented in the 1960s. There are currently three common types of lasers: gas lasers, such as ammonia lasers and argon lasers; in common cases, they are made of solid-state molds. Semiconductor lasers, such as the laser head of an optical disc drive and the print head of a laser printer. The Laser pointer is a semiconductor laser. It has the advantages of stable energy output, small size, simple structure and low cost, and can be directly used for engraving. This is a typical example. Using it, it is still a good light source for optical experiments.
You can experiment with the law of light refraction. First paste the white paper on the square wooden board, and draw the rectangular coordinates on the white paper with a pencil, so that the long straight side of the semicircular glass brick coincides with the coordinate axis. Place the experimental equipment as shown in Figure 2 so that the laser pointer emits light and the incident light passes through .
You can also experiment with the law of light reflection. First paste the white paper on the square wooden board, draw the rectangular coordinates on the white paper with a pencil, make the long straight side of the semicircular glass brick coincide with the coordinate axis, and then place the experimental equipment to make the laser pointer shine and adjust the incident light to pass through After the glass brick passes through the coordinate origin O. Gradually increase the incident angle and observe the changes in refracted light.
