What Is A CO₂ Laser?

A carbon dioxide (CO₂) laser is a high-power, high-efficiency gas laser and one of the most widely used industrial lasers in the world. It was invented by C. Kumar N. Patel at Bell Labs in 1964.

Core Operating Principle:

• Active Medium: The primary laser medium is carbon dioxide (CO₂) gas, typically mixed with auxiliary gases like nitrogen (N₂) and helium (He) to enhance performance.

• Excitation Process: An electrical discharge (usually DC or RF current) excites the nitrogen molecules

  These excited N₂ molecules then collide with CO₂ molecules, efficiently transferring energy and populating the upper laser energy level of CO₂, creating a population inversion.

• Laser Output: When these energized CO₂ molecules undergo stimulated emission, they transition to a lower energy level, emitting infrared laser light with a primary wavelength of 10.6 micrometers (or other lines between 9-11 μm)

  . This beam is invisible to the naked eye.

Key Technical Parameters & Characteristics:

The CO₂ laser is a cornerstone of industrial laser technology, valued for its high power, good efficiency, excellent beam quality, and relatively low cost. It is dominant in processing non-metals (e.g., wood, plastics, glass, ceramics) and is also widely used for metal cutting, medical procedures, and military applications. Its 10.6 μm wavelength lies within an atmospheric transmission window, making it suitable for long-range applications like laser radar