Constructing efficient and robust lasers is no easy task. The higher the output of the laser, the more heat must be dissipated. If this is not done constantly and efficiently, the result will be tension in the laser material. This will in any case have a negative impact on the uniformity and quality of the laser beam and can, in extreme cases, lead to the laser material tearing or bursting.

A very elegant method for solving this problem is offered by the fibre laser. The laser material is in the form of a thin fibre, similar in shape to a normal glass fibre. Its large surface area ensures even and efficient cooling. Additionally, the fibre conducts the light in such a narrow stream that the laser produces an excellent beam quality.

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