A laser projector creates a light show that seems to be coming from dozens of laser beams. In actuality, a laser projector only needs a single laser beam to create the effect because the beam is diffracted as it emerges from the projector. Making your own laser projector requires a few parts from a laser supply house and some skill and knowledge of electronics. The laser projector should be considered a weekend project because it will take some time to complete.

                                                               Things You'll Need 

                                                                                Newspaper

                                                                                Four 6-inch long black wires

                                                                                Four 6-inch long red wires

1.

Put the newspaper down on a table. Strip both ends of all of the black and red wires using the wire strippers.

2.

Hold the green laser pointer in your left hand and grip the front of it with the pliers held in your right hand. Twist the pliers until the casing of the laser pointer separates.

3.

Hold up the back half of the laser pointer to reveal the green laser diode. Pull out the diode using the tweezers. Discard the green laser pointer and put the green laser diode down on the newspaper.

4.

Twist the laser housing between your hands and unscrew the front half from the back half. Pull the laser diode out of the back half using the tweezers and replace it with the green laser diode.

5.

Solder a black wire to the positive contact on the green laser diode and a red wire to the negative contact. Pull the two wires through the front half of the laser housing and screw the laser housing back together.

6.

Solder the end of the black wire from the laser housing to the 15 ohm resister. Solder the black wire from the battery snap to the 15 ohm resister. Solder the end of the red wire from the laser housing to the microswitch. Solder the red wire from the battery snap to the microswitch

7.

Attach a 9 volt battery to the battery snap.

Making the Laser Projector

8.

Cut out one of the sides of the shoebox with the utility knife.

9.

Cut out a small hole in the center of the top of the lid of the shoebox with the utility knife.

10.

Put the lid onto the shoebox. Tape the lid down on the shoebox using duct tape.

Assembling the Motor

11.

Drill a small hole in the center of the diffraction glass. Place the diffraction glass aside.

12.

Solder a black wire to the positive contact of the 3 volt motor. Solder the other end of the black wire to the microswitch. Solder a black wire to the microswitch and the other end to the positive contact on the "D" battery compartment.


13.

Solder a red wire to the negative contact on the 3 volt motor.

14.

Solder the other end of the red wire to the negative contact of the "D" battery compartment.

15.

Put "D" batteries into the "D" battery compartment.

Assembling the Projector

16.

Put the entire laser assembly inside of the shoebox through the cut-out side of the shoebox. Pull the laser housing out through the hole in the lid on the top of the shoebox.

17.

Place the entire motor assembly and battery parts inside of the shoebox through the cut-out side of the shoebox.

18.

Pull the motor out through the hole in the lid on the top of the shoebox. Place the diffraction glass on the tip of the motor shaft and solder it on. Let the solder cool.

19.

Place the motor down on one side of the the lid on the top of the shoebox and secure it using duct tape.Place the laser housing down on the other side of the lid on the top of the shoebox with the laser diode aimed at the diffraction glass. Mount the laser housing to the shoebox using duct tape.

20.

Press the switch to start the motor and spin the diffraction glass. Press the switch to turn on the laser.