Ultrafast fiber lasers are mode-locked lasers that generate ultrashort pulses operating in the picosecond and femtosecond range. The high-energy and precision offered by ultrafast fiber lasers make them ideal for applications that require very precise cutting, such as material processing, bio-medicals, sensors, and optical communications. In the future, these lasers show promising potential in the medical field as they may have the ability to treat diseases like HIV and Ebola virus by damaging their viral capsids. They also show promise in the applications of disinfecting medication and producing inactivated vaccines.