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Now, let¡¯s turn our attention to single longitudinal mode (SLM) lasers. As a core device, SLM lasers are highly valued for their high spectral purity and narrow linewidth. These properties enable their wide application in high-resolution spectroscopy, precision fiber sensing, and coherent optical communications.
However, the development of SLM lasers currently faces significant challenges. Short-cavity design, while compact in structure, is limited in output power and efficiency. On the other hand, long-cavity design can achieve higher power but is prone to mode hopping and poor stability, which affects its reliability in practical applications.
Fortunately, the mode selection method based on a saturable absorber (SA) stands out. It features a simple principle and ensures high system stability, making it a promising solution to overcome the aforementioned challenges. The schematic diagram on the slide clearly shows the comparison between short and long cavity fiber lasers, helping us better understand their respective characteristics. |
IEEE/ICACT20260337 Slide.05
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