Why does a fiber laser burn?

2019-07-04 15:13

A fiber laser is a laser that uses a rare earth-doped glass fiber as a gain medium. It is an important component of a laser machine. It is used in laser marking machines, laser welding machines, laser cutting machines, and laser engraving machines.


Fiber lasers can be developed on the basis of fiber amplifiers: under the action of pump light, it is easy to form high power density in the fiber, which causes the laser energy level of the laser working substance to “reverse the number of particles” when a positive feedback loop is properly added. Forming a resonant cavity) forms a laser oscillation output.

fiber laser

When using a laser machine, if the fiber laser burns, how can it be corrected? Many people will be helpless, and Rayspeed will provide solutions for everyone in this article.


When a fiber laser burns, it is crucial to first confirm where the combustion occurs.


If the ignition point is in the middle of the laser, it is likely that the fiber is defective, for example, cracks, squeezing, causing the laser to leak from the core, and accumulating too much heat to cause the fiber to burn.


This is the most common phenomenon if the ignition point is at the coupling end of the laser chip and is usually caused by several reasons:

1. The end face or side of the fiber is dirty

In particular, some organic matter is adsorbed on the end faces, causing the laser to generate heat at the end faces.

2. Chip beam quality is poor

In particular, light collimation and focusing are not done well, and the spot is too large and larger than the core. Will cause a lot of lasers to enter the cladding, which will lead to batch burning, many chip manufacturers are facing this problem.

3. The fiber is not cured well.

In particular, many processes are glued together. When the glue shrinks due to temperature changes, the core and the laser beam are not aligned in the center, causing many lasers to enter the fiber cladding, then exiting the coating and burning the coating.

4. Fiber end face coating quality is poor

There is a black pitting point that absorbs the laser to produce high temperatures.


After reading this article, if the fiber laser is expected to burn, we can easily deal with and troubleshoot. However, we do not want this to happen during use. Therefore, we must first select high-quality laser machines, and secondly focus on the daily maintenance of fiber lasers.


If you are looking for a quality fiber laser marking machine, fiber laser welding machine, fiber laser cutting machine, Rayspeed can provide you with the best products.