What Is A Laser?

 

What Is A Laser?


Laser:

  • High intensity and high brightness
  • Wavelength frequency determination, good monochrome
  • Good coherence and long coherence length
  • Good directionality, it’s almost a bunch of parallel light.


When the laser beam is directed onto the surface of the workpiece, the light energy is absorbed and transformed into heat energy.

This causes the temperature at the point of irradiation to rapidly increase, melt, and vaporize, forming a small pit.

The metal surrounding the pit melts due to thermal diffusion. The vapor in the small pit expands rapidly, causing a micro-explosion, and the molten material is expelled at high speed, generating a highly directional anti-shock wave.

This results in the formation of a hole with a large upper side and small lower side on the surface being processed.

Comparison of Ordinary Light and Laser:

The Generation of Laser





Laser generating gas is different from cutting gas.

Laser generating gas composition:

  • N2: The energy generated by the RF generator first excites N2, causing it to be in a transition state.
  • CO2: N2 in the transition state will excite C02 which causes CO2 to transition, and releases the laser.
  • He: Absorb CO2 and excess energy, cool the system and turn it into heat.

The proportional relationship between the above mentioned three gas is:

N2:CO2:He = 1:4:5

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