Which laser source is better - DC or RF?
It depends on what your requirements are. DC lasers are clearly the cheapest option if your main concern is up-front cost. However, they need to be replaced after only two years, whereas RF laser sources can be used for almost three times as long. (So in the end, the costs between the two may not be as different as they appear.)
The reason for the striking differences in durability is the material used in the laser tubes. DC systems use comparatively brittle, breakable glass, whereas RF systems use a much more robust metal and ceramic construction.
In addition to acquisition costs, the future purpose plays an important role. If materials with a rather low precision requirement are often to be cut, a laser with a DC system is recommended. These systems have proven to be effective for the textile industry in low-wage countries because a larger kerf (due to the lower beam quality) is irrelevant. The short service life and unpredictable machine downtime make DC systems unsuitable for automated production lines.