1: Pay attention to the safety of the laser battery, and prevent others from disassembling the electric power cell to cause

short-circuit burning or battery explosion accidents.

2: The specificity of the laser emission principle and the production process determines that the laser has the characteristics

that ordinary light does not have: three good (good monochromaticity, good coherence, good directivity) and high (high

brightness).

3: Mainly used for laser toys, various level meters, ground wire meters, etc.

Making an electronic pointer pen: The teacher uses laser projection points to remind students to observe and think.

Electronic level: Let the motor drive the bald head to rotate or twist, and project it into a straight line on the wall for

reference when decorating or posting New Year pictures.

Miniature LCD projection: Remove the condenser lens and let the laser pass through the controllable LCD screen, which can produce

a clear projection on the wall.

Long-distance laser monitor: Let the laser shine on the glass of the room being eavesdropped on, and then receive the laser beam

reflected from the glass, and detect the vibration of the glass to restore the sound of the room.

Long-distance light-controlled anti-theft alarm: install a laser emitting tube and a photoresistor at one corner of the fish pond

or watermelon field that needs to be protected, and install a mirror at the other three corners to form a protection zone.

Long-distance laser wireless communication: Use a pair of laser transceivers to face each other on two remote roofs, and use the

serial communication protocol of the single-chip microcomputer to send and receive files, and even network.

The laser head is composed of three parts: a light-emitting tube core, a condenser lens, and a copper adjustable sleeve. When sent

to the user, these three parts have been assembled, the lens focal length has also been adjusted, and it has been glued with

strong glue, and the user connects 5V DC power supply can work.

Take special care not to face people’s eyes.

If the laser head needs to be lit for a long time, please increase the current-limiting resistance appropriately

Special note: This laser head emits a red laser beam, that is, a parallel beam. The faint red line can only be seen under the

premise of fog or other media, and under normal circumstances it is a red dot.