Advances in Fiber Lasers in the 1–2 µm Band: From Continuous-Wave to Ultrafast Regimes

Dear Colleagues,

Fiber lasers have experienced remarkable development in recent decades, positioning themselves as one of the most versatile and efficient technologies for generating laser radiation across a wide spectral range. In particular, the 1-2 µm wavelength region has gained significant relevance due to its wide-ranging applications in telecommunications, materials processing, medicine, spectroscopy, and remote sensing. This issue addresses the most recent advances in the design, underlying physics, and implementation of fiber lasers operating within this spectral window, encompassing continuous wave (CW) sources as well as pulsed systems based on Q-switching and mode-locking techniques. In addition, emerging ultrafast modulation methods are considered, which enable laser emission to be tailored to specific requirements in terms of power, pulse duration, and repetition. Current technological challenges and the strategies adopted to improve the efficiency, stability, and compactness of these systems are also discussed, especially compared to competing technologies that do not rely on saturable absorbers. Collectively, these developments underscore the key role of fiber lasers as adaptable and high-performance platforms for next-generation scientific and industrial applications.

Dr. Manuel Duran Sanchez
Guest Editor

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