The materials needed for laser production of projector are: laser, laser diffraction grating and some auxiliary equipment.

1. Select laser: It is more suitable to build a 3W laser. If the laser power is too high, it is easy to damage and destroy the eyes. Laser with different wavelengths can be selected as required.

2. Select laser diffraction grating: diffraction gratings have different parameters such as linear density, and different gratings can be selected as needed.

3. Installation of laser diffraction grating: Install the selected laser diffraction grating in a suitable position. It is recommended to use a spiral barrel frame or other suitable supporting frames.

4. Connect the power supply, driver, etc. Connect the power supply and driver of the laser to the projector. If possible, integrate the laser and driver into one device for easy use.

5. Adjust light intensity, direction, etc. Turn on the laser and driver, and adjust the direction and intensity of the laser as needed. If necessary, the beam path can be adjusted or adjusted by using a lens.

6. Test: aim the projector at the wall or other plane and observe the laser pattern diffracted by the diffraction grating. Fine-tune and retest if necessary.

7. Finish: After finishing the adjustment, you can continue to use the projector laser. It should be noted that the safe operation of the laser is very important. Please make sure to follow the instructions provided by the manufacturer and follow the safety specifications.