This review introduces typical fractal structures and related control methods present in lasers, such as soliton fractals in single?pass optical fibers, fractals in vector soliton collisions, fractals in spin wave solitons, and fractals in breather lasers. It elucidates the characteristics of fractal lasers in mode?locked lasers, including high spectral density, strong anti?interference capabilities, high tuning precision, and the ability to achieve high?resolution femtosecond fiber combs. The paper discusses the issue of enhancing the resolution of femtosecond fiber combs, pointing out that using devil's staircase and Farey tree fractal structures in breather lasers, combined with intelligent tuning methods, can improve the detection resolution of femtosecond fiber combs. It forecasts the development directions of breather fractal combs in fields such as molecular spectroscopy and arbitrary optical wave synthesis. The paper suggests that by developing high?precision optical frequency domain locking technology, time?frequency phase holographic tracking detection technology, fractal spectrum correlation and phase noise analysis technology, and optimizing theoretical models, it is expected to further suppress comb noise and break through the spectral density limits.