Modern laser diodes achieve wall-plug efficiencies exceeding 50% and demonstrate remarkable wavelength stability through integrated temperature control systems. Not only does direct fiber integration reduce system complexity, susceptibility to interference and costs, but the brilliance of the emitted laser radiation also increases significantly. In 2019, within the BMBF-funded EKOLAS project, Fraunhofer ILT took part in developing a process that had. The complexity of fiber laser systems can be reduced enormously with fiber Bragg gratings (FBGs). If the optical gratings are written directly into the fiber, they can replace external resonator mirrors. This eliminates the need for time-consuming mirror alignment. ) Figure 2: Tunable external-cavity diode lasers in Littrow and Littman–Metcalf configurations.
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