The angle of radiation of CO2 laser is very small and its energy density is high. Output power density will reach several kilowatts per square cm. if it is focused. So the boiloff and cautery of focus tissue can be used in the therapy. Also if it isn't focused, the laser radiating focus tissue can bring about concretion effect.

CO2 laser surgical system outputs infrared rays which wavelength is 10600nm . Its penetrability is comparative large. Because it can incise focus tissue after focusing, CO2 laser  surgical system is also considered as laser scalpel. If beam of laser is enlarged, it is good for the heating-up physical therapy of the deepest tissue.

According to the output power CO2 laser therapy instrument has three kind:great type, medium type and desktop type. 

Major features include:

Compact and easy to operate.
Sealed-off CO2 laser technology.
CW, pulse, and super pulse operation modes
Touching switch, microprocessor controlled
Alphanumeric message display
7-joint spring-balanced articulated arm
Pilot beam of 5mW diode laser
Safety protection with alarming   automatically