Second: Design input
Most laser cutting machine cuts difficult parts for machines. Or, it engraves designs on architectural pieces. The right expertise, however, with their skill can do a lot of other tasks. Most of these systems are controlled by computer programming which provides a secure way of cutting at a suitable speed.
Third: the laser focusing
Finally, after the setting of the design and the material is set on the table the powerful lens focusses the laser beam. The very thin, light stream powered by carbon dioxide in most modern industrial lasers gives off radiation at a 10.6 micrometers wavelength which is hardly noticeable to the naked eye.
Words of caution
The whole host materials for laser cutting like Wood, Acrylic, Plastic, Paper, are flammable. So never walk away in the middle way.
Aluminum is quite reflective and it can potentially send back the laser beam to its source that might damage the laser diode. If cut any reflective thing, never put the reflective plane facing upwards. Also, be convinced that you are not using high power.
The power can be controlled by you while printing. More power will generate more heat and there will be more chances of setting on fire. Handle laser cutting machine with caution to ensure your safety.