Fiber lasers are known to offer advantages in maintaining stable operation over years, low total cost of ownership, and predictable operation in a small package. Few mirrors need aligning. At high power, the fiber laser provides simpler heat removal of high powers in a long thin fiber. The simplicity of a fiber removes the need for water cooling, and usually air cooling or conduction cooling is sufficient. The fiber laser can usually be more compact, important for embedded applications. For these and other reasons, industrial and medical laser sources have been migrating to fiber lasers where possible.