Limitations of the 915 nm band pumping scheme

The industrial fiber laser market is growing rapidly, and this momentum will continue to be maintained in the next five to ten years. Semiconductor lasers as their core components need to be re-examined.

The market for medium and low power fiber lasers is fierce, and the high power fiber laser market is in urgent need of development.

With the increasing homogenization of medium and low power fiber lasers (output power below 1500 watts), the market competition is becoming increasingly fierce. Many leading fiber laser manufacturers have begun to turn their attention to high-power fiber lasers (output power of 1500 watts or more). The market wants to achieve greater success. In the past, a semiconductor laser of 915 nm band was used as the pump source of the fiber laser. Although the 915 nm laser has a wavelength drift coefficient of 0.3 nm/° C., the absorption source of the gain active fiber in the 915 nm band is wide, and the laser pump source is subjected to the ambient temperature. The affected central wavelength drift has little effect on the absorption efficiency of the gain fiber, and the fiber laser is not sensitive to the working environment temperature. Therefore, the 915 nm band pumping scheme is widely recognized in the medium and low power fiber laser market.

The 915 nm band pumping scheme has limitations in the development of high power fiber lasers.

When designing a high-power fiber laser solution, the drawbacks of using the 915nm pump source in the past have begun to stand out. Due to the low absorption efficiency of the gain active fiber in the 915 nm band, in order to achieve higher power output of the whole fiber laser, it is technically required to use a higher 915 nm pump power and a longer active fiber, which will lead to developers. Have to face the nonlinear effects of fiber, loss of light and light efficiency, increased difficulty in thermal management, rising cost per wattage and many other difficulties. When the output power exceeds a certain level, the 915 nm pumping scheme will become extremely complicated and eventually fail. High power fiber lasers therefore require a more efficient industrial pumping scheme.

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