The double-clad fiber introduced in the 1990s uses single-mode fiber surrounded by multimode cladding, which can efficiently put higher power and lower cost multimode semiconductor pumped green laser pointer into the fiber, thereby creating a A more economical way to convert high power semiconductor lasers into brighter lasers. For Yb-doped fibers, the pump excites a broad absorption centered at 915 nm or a narrower band characteristic around 976 nm.
As the pump wavelength approaches the lasing wavelength of the fiber laser, so-called quantum defects will decrease, thereby maximizing efficiency and minimizing the amount of waste heat dissipation. Both fiber lasers and diode-pumped solid-state lasers rely on improvements in diode laser brightness. In general, as the brightness of diode lasers continues to improve, the proportion of laser power they pump is also increasing.
The brightness enhancement of semiconductor green laser pointers is helpful to promote more efficient brightness conversion. As we would expect, spatial and spectral brightness will be necessary for future systems, which will enable low quantum defect pumping with narrow absorption characteristics in solid-state lasers and dense wavelength multiplexing for direct semiconductor laser applications The plan becomes possible.